СВЯЗАННАЯ С ВТСП ЧАСТИЧНАЯ ИЗОЛЯЦИЯ ДЛЯ ВТСП-КАТУШЕК ВОЗБУЖДЕНИЯ

Изобретение относится к электротехнике. Технический результат заключается в уменьшении неравномерной потери сверхпроводимости без значительного увеличения толщины ВТСП-катушек. Высокотемпературная сверхпроводящая, ВТСП, катушка возбуждения содержит множество витков, содержащих материал ВТСП и металлический стабилизатор, и частично изолирующий слой, разделяющий витки, так что ток может распределяться между витками через частично изолирующий слой. Частично изолирующий слой содержит изолирующую область и множество электропроводных путей через изолирующую область, при этом ток может распределяться между витками по электропроводным путям. Каждый электропроводный путь содержит ВТСП-мостик, содержащий материал ВТСП, причем ВТСП-мостик расположен последовательно с нормально проводящим материалом электропроводного пути. 5 з.п. ф-лы, 19 ил.

ЗАЩИТА ОТ ПЕРЕХОДОВ В НОРМАЛЬНОЕ СОСТОЯНИЕ В СВЕРХПРОВОДЯЩИХ МАГНИТАХ

SUPRALEITENDE MAGNETVORRICHTUNG

Schalenanordnung aus Verbundlaminat für Anwendung in Magneten

Cryostat Vent Valve

Wire for superconductive magnets

... 952226 Making wire; drawing WESTERN ELECTRIC CO Inc 22 Aug 1961 [29 Aug 1960] 30245/61 Headings H1A A5 and A4D A method of making wire of super-conductive material comprises coating the material 2 of e.g. molybdenum-rhenium or bismuth-lead with a layer of silver, gold or copper 1 and cold working the coated material to reduce its cross-section to form the wire with a continuous metal coating. The wire may be subjected to inter-stage annealing in an inert atmosphere. In an example a molybdenum-rhenium wire was reduced to 0.0127 cm., gold electro-plated until an amount of gold equal to 8 wt. per cent of the total weight of the wire and gold was deposited on the wire and re-drawn to 0.0025 cm. A super-conducting magnet using the wire is described (see Division H1).

Superconducting magnet coil system

A superconducting magnet coil system with first 1 and second 2 superconducting coils connected in series, the first having a higher critical temperature than the second coil. The first and second coils are bridged by, and form a loop with, a first quench protector 6. There is a third superconducting coil 3 which forms a second loop with a second quench protector 8. A heater 9 heats the second main coil portion. The loops are connected in series. The coils may be radially nested. The first coil may have the highest critical temperature, preferably being a HTS and the innermost coil. The second coil may be an LTS, preferably NbTi or Nb3Sn. The second quench protector may: bridge the third coil portion; bridge a series connection of the third coil and a fourth coil with a higher critical temperature; serve as the heating element; or be connected in parallel to the first quench protector. There may be a heating control device which can detect a quench. The coil system may be used for NMR. A ...

Superconducting magnet coil system

A cryogenic magnet control system

Superconducting magnet coil system with quench protection

A superconducting magnet coil system comprises a main field coil 1 formed with radially nested sections which are connected in series. The radially inner sections 3 are formed with a first superconductive material and a first insulation and the outer sections 4 are formed with a second superconductive material and a second insulation. The first superconducting material has a higher critical magnetic field than that of the second superconducting material and the first insulation has at least some areas with a smaller dielectric strength than that of the second insulation. A shield coil 2 radially surrounds the main field coil 1 and is connected 5 in series with the said field coil. The shield coil 2 comprises the second superconductive material and second insulation. The main field coil 1 and shield coil 2 are shorted-circuited by a superconducting switch 8 during operation and are protected by resistors and/or diodes 6, 7 during a quench. The radially inner sections 3 of the field coil ...

Frequency control of multiple heating elements in a cryostat, for example for MRI

A switching circuit comprising a plurality of heating elements (12), each connected as part of a tuned circuit (36), the tuned circuits being respectively tuned to different frequencies and connected in parallel between two common conductors (34), the circuit further comprising means (20, 38, 40) for applying an oscillating signal voltage between the two common conductors, at one or more frequencies each corresponding to a tuned frequency of one of the tuned circuits. The heating elements are for quench protection or superconducting switches in a cryostat, for example as used in magentic resonance imaging.

Passive quench protection circuit for superconducting magnets

Apparatus and method for protecting a magnetic resonance imaging magnet during quench

A superconducting magnet arrangement 100, a method of protecting a superconducting magnet or a magnetic resonance imaging system, comprises: superconducting coils 106, 108, 110, 112 within a cryogenic vessel 102, which are connected to a power supply 114. A dump resistor 127 is located external to the vessel 102. The magnet is provided with a switch 126 and a control device 128 with means to dump the energy of the magnet through the dump resistor 127. The switch 126 may be opened to provide the magnet with a ramp mode of operation or closed to provide the magnet with a persistent current mode of operation. The coils 106, 108, 110, 112 are connected in series and may be linked at tap points to heater elements which may be arranged to open the switch 126 when a quench condition arises in the coils. Various forms of quench detection may be used with the control device 128 of the magnet arrangement. A relay switch 120 may be used to switch between a power supply 114 or a dump resistor 127 being ...

Switching circuit for controlling multiple heating elements

Apparatus for generating magnetic flux

... 1,038,554. Electric coils. WESTERN ELECTRIC CO. Inc. March 8, 1963 [March 22, 1962], No. 9225/63. Heading H1P. An apparatus for generating magnetic flux comprises in the embodiment shown at least two cylindrical layer coils 1, 2 of superconducting wire interconnected to form a closed loop, means for establishing a magnetic field H 0 in a direction substantially parallel with the coil axis while the loop is in a normal conducting state, means for cooling the loop to a temperature below the superconducting transition temperature of the wire after current induced in the loop by the field has decayed, and means for reducing or eliminating the field. The wire may be Nb-Zr or Nb 3 Sn, as described in Specification 941,339, and have an outer coating of normal conducting material, such as disclosed in Specification 952,226. The field may be adjusted by the application of a further external field H 0 1, poled in either direction, after the loop has become superconductive. In other embodiments ...

Improvements in or relating to superconductors

... 1128972 Testing super-conductors UNITED KINGDOM ATOMIC ENERGY AUTHORITY 3 Aug 1966 [19 Aug 1965] 35700/65 Headings H1A and A4D A method of testing a super-conducting cable (see Division H1) formed by a super-conductor in intimate contact throughout its length with a normal conductor of high conductivity, comprises: passing a current through a short length of the cable whilst it is immersed in a cryogenic coolant, and subjected to a magnetic field of known magnitude; momentarily heating a small portion of the super-conductor sufficiently to cause it to go normal and the current to transfer to the parallel normal conductor; repeating the last step for increasing values of current until a value of current, minimum propagating current, is reached at which the super-conductor remains normal; and repeating all the steps for other known values of magnetic field. The cable (1) Fig. 1 (not shown) is connected to a supply (4) and the local heating is effected by a coil (5) connected to an auxiliary ...

SUPERCONDUCTIVE MAGNET DEVICE

Passive adaptive quench propagation circuit

Methods and apparatus for protecting an MR imaging system

NEW MANUFACTURING PROCESSES OF A COIL

Superconducting coil

ELECTRICAL TRANSFORMER WITH SUPERCONDUCTING WINDINGS

SUPERCONDUCTING SWITCH INCORPORATING A STEERING DIODE

QUENCH PROTECTION IN SUPERCONDUCTING MAGNETS

A toroidal field coil comprising a central column, a plurality of return limbs, a quench protection system, and a cooling system. The central column comprises HTS material. Each return limb comprises a quenchable section, two HTS sections, and a quenching 5 system. The quenchable section comprises superconducting material, and is configured to contribute towards a magnetic field of the toroidal field coil. The HTS sections comprise HTS material. The HTS sections electrically connect the quenchable section to the central column and are in series with the central column and the quenchable section. The quenching system is associated with the quenchable section 10 and configured to quench the quenchable section. The quench protection system is configured to detect quenches in the toroidal field coil and, in response to detection of a quench, cause the quenching system to quench the superconducting material in one or more of the quenchable sections in order to dump energy from the toroidal field ...

SUPERCONDUCTING MAGNET

A superconducting magnet having a beam member installed diametrically in a ring superconducting coil container for supporting hoop stress of the coil being partly or entirely composed of electrical insulators or high resistivity materials. Alternatively, a portion of the radiant heat shield covering the beam member can be partly or entirely composed of electrical insulators or high resistivity materials. In accordance with the above arrangements, eddy current generated in the coil container when the container crosses a magnetic field caused by eddy current generated in the radiant heat shield when the shield crosses a strong magnetic field caused by the superconducting coil with relative vibration of the heat shield to the coil by a dynamic cause can be suppressed. Accordingly, heat generation in the superconducting coil container can be reduced, and consequently, quenching of the superconductor can be reduced.

PASSIVE SUPERCONDUCTING QUENCH DETECTION SENSOR

W.E. No. 54,965 The present invention provides a passive superconducting sensor for quench detection in a superconducting coil. The sensor consists of a first circuit electrically connected to two voltage taps of a superconducting coil. The first circuit uses nonsuperconducting components and preferably contains a resistive element. The first circuit is magnetically coupled to a second circuit by a hybrid transformer. The second circuit is superconducting and contains a readout coil and preferably a second hybrid transformer. The second hybrid transformer is magnetically coupled to a sense coil which detects flux changes in the superconducting coil. The readout coil is coupled to a readout device which measures changes in the current through the readout coil. The current in the readout coil can be made a function only of the resistance of the superconducting coil between the voltage turns and thus can be used to detect a quench.

Supraleitende Magnetspule

Supraleitende Spule

Schutzeinrichtung für supraleitende Erregerwicklungen

Einrichtung zur Erzeugung starker Magnetfelder von kurzer Dauer

Supraleitende Magnetspule

Procédé pour transférer une énergie à un milieu conducteur et appareil pour la mise en oeuvre de ce procédé

Strombegrenzungseinrichtung, insbesondere zur Kurzschlussstrombegrenzung in Energieübertragungsanlagen

Conducteur électrique hétérogène pour supraconduction

Schutzeinrichtung für supraleitende Erregerwicklungen

Procédé de détection des transitions dans des bobines supraconductrices

Strombegrenzungseinrichtung, insbesondere zur Kurzschlussstrombegrenzung in Energieübertragungsanlagen

Zusammengesetzter elektrischer Leiter und dessen Verwendung in einem supraleitenden Magneten

Verfahren zur Erzielung eines Suprastromes in einer aus supraleitfähigem Material bestehenden Elektromagnetwicklung und Anordnung zur Durchführung dieses Verfahrens

Supraleitungsspule

Bobine supraconductrice munie d'un dispositif de refroidissement

MAGNETIC FIELD GENERATOR AND PROCEDURE FOR THE ENTERPRISE OF THE SAME.

Superconducting magnetic system

The system contains a superconducting coil (1) which is divided into sections and in the case of which each coil section (2) has a switch (3), which is connected in series with it, and a controlled shunt path (4), which is connected in parallel with the coil section and with the switch (3) and consists of superconducting material, as well as a device (5) for detecting normally conductive zones. The coil (1) is inductively coupled to a device (6) for energy dissipation. The latter is provided with a heat-insulated cavity (7) which is cooled down to low temperatures. Located in the cavity (7) are the switches (3) and at least one coil (8), which is produced from normally conductive metal, with a bridge (9) which is designed from super conductive material, which together form a closed electrical circuit (10). Each controlled shunt path (4) and the bridge (9) are provided with control windings (11 and 12 respectively). The control windings (11) are electrically connected to corresponding devices ...

PARTIALLY INSULATED TEMPERATURE SUPERCONDUCTOR - WINDING

SUPERCONDUCTIVE SWITCH

A CURRENT-LIMITING ARRANGEMENT

ACOUSTIC DIAGNOSTIC SYSTEM AND METHOD FOR SUPERCONDUCTING DEVICES OPERATING IN GAS OR LIQUID

A novel system and method for detecting a quench of a superconducting conductor and detecting abnormal behavior of a superconducting conductor using acoustic sensor technology in the coolant of a superconducting cable and/or magnet is disclosed. This system and method is not only limited to use for superconductors, but also may be used for any device disposed in liquid and gas. Acoustic sensors are installed along a coolant space of a superconducting conductor and monitor coolant conditions. By monitoring acoustic changes, temperature changes or coolant flow disruption can be detected very quickly by an acoustic sensor array. By disposition of the acoustic sensor array in a coolant flow channel, the acoustic sensor system can quickly detect a local condition, such as the thermal status (temperature) of a superconducting cable and magnet with precise spatial resolution.

BOBBIN STRUCTURE FOR WINDING OF SUPERCONDUCTING WIRE ROD

Disclosed is a bobbin structure for winding a superconducting wired rod, which can secure a minimum radius of curvature that can prevent a deterioration in mechanical properties and a decrease in the uniformity of electromagnetic force distribution, due to contraction and expansion acting on the wire rod during quenching of the superconducting wire rod, and which also can ensure uniformity of temperature over all portions of the superconducting wire rod by securing a cooling channel required for cooling of the superconducting wire rod.

Superconducting magnet device

A superconducting magnet device which is capable of protecting at the time of quenching a superconducting magnet divided into a plurality of sections comprises a superconducting magnet circuit which is formed by sequentially connecting in series coil pairs 1a, 1b, and 2a, 2b which are positioned symmetrically with respect to a ferromagnetic shield 6, and by connecting in parallel to the superconducting coils 1a, 1b and 2a, 2b superconducting coil protecting elements 3a and 3b which protect the superconducting coils 1a, 1b and 2a, 2b when the voltage at the ends of the coils has exceeded a predetermined value. If quenching occurs at the superconducting coils 1a, 1b and 2a, 2b, generation of an unbalanced electromagnetic force, a local electromagnetic force, etc., against the ferromagnetic shield 6 is prevented, so that the support structure for the superconducting coils and the ferromagnetic shield can be simplified.

Superconductive magnet apparatus

To achieve a superconductive magnet apparatus which can suppress the consumption of liquid helium even if a quench phenomenon occurs in the superconductive coil to prevent a reduction in its cooling ability. The superconductive magnet apparatus comprises a superconductive coil 3 which is immersed in liquid helium 2 and stored in the helium container 1, an induction coil 12 which is magnetically coupled to the superconductive coil 3 and thermally insulated from the helium container 1 from each other, and a switching element 14 which forms a closed circuit 13 between both ends of the induction coil 12 when it is made active.

Superconductive switch

A superconductive switch having a high operating rhythm. The superconductive material in a thin layer is cooled by a permeable fibre glass strip which brings the cryogenic fluid into contact with it. Application to the feeding of a device by successive discharges of a superconductive storage winding.

MRI apparatus, operation method thereof, and quenching prevention device

In order to prevent quenching caused accidentally in a superconducting magnet, an MRI apparatus vibrates the superconducting magnet in order to prevent quenching of the superconducting magnet in a time period for which a predetermined imaging sequence is not executed (step 210). As a specific method, a gradient magnetic field may be generated by a gradient magnetic field coil for an imaging sequence of the MRI apparatus, or a gradient magnetic field may be generated using a gradient magnetic field coil for vibration provided apart from the gradient magnetic field coil for an imaging sequence. In addition, in a period for which the predetermined imaging sequence is not executed, a phantom may be imaged to prevent the quenching of the superconducting magnet.

Laminated composite shell assembly for magnet applications

MANUFACTURE OF SUPERCONDUCTING MAGNET

PURPOSE: To make it possible to manufacture a highly efficient small size superconducting magnet in which a quenching is hardly generated by a method wherein the inner layer of a coil is constituted using a completely stabilized superconducting wire material, the coil layer on the side outer than the above-mentioned layer is constituted by an incompletely stabilized superconducting wire material. CONSTITUTION: A superconducting coil is formed by winding a superconducting wire on a coil bobbin 1 as far as to the n-layer shown in the diagram. The first layer on the innermost layer side and the second layer are formed using a completely stabilized superconducting wire material 2. The third layer and upward layers are formed using an incompletely stabilized superconducting wire material 3. The electromagnetic force applied to the coil wire material when excitation is F2 at both end parts of the first layer. The electromagnetic force applied to the coil wire material in the vicinity of the center ...

SUPERCONDUCTING COIL APPARATUS

PROBLEM TO BE SOLVED: To provide a superconducting coil apparatus capable of keeping stable dielectric strength as it is even when a superconducting state of a superconducting coil is broken into a normal conduction state. SOLUTION: The superconductinng coil apparatus comprises a superconducting coil 10 on which a superconducting wire material 1 is wound, and which has a lead wire 4; and a low temperature container 6 for storing a low temperature fluid 5 serving to immerse and cool the superconducting coil 10. The superconducting coil apparatus includes bubble preventing means (11) for preventing air bubbles formed when the superconducting coil 10 produces heat owing to current application loss or normal conduction transition from flowing into the vicinity of the lead wire 4. COPYRIGHT: (C)2007,JPO&INPIT ...

SUPERCONDUCTING COIL AND SUPERCONDUCTING MAGNET, AND OPERATIONAL METHOD THEREOF

PROBLEM TO BE SOLVED: To provide a superconducting coil and a superconducting magnet that can avoid burnout thereof in cases where a quench occurs by local temperature rise during operation in a persistent current mode of the superconducting magnet, and a method for operating the superconducting magnet. SOLUTION: A superconducting coil 2 includes a parallel conductor 23 formed by a plurality of superconducting winding materials 21 and 22. The parallel conductor 23 is coiled. A power source for supplying currents to flow back and forth between the superconducting winding materials 21 and 22 in the parallel conductor 23 remains connected when a quench occurs. A superconducting magnet 10 includes the super conducting coil 2, a persistent current switch 1 connected to the super conducting coil 2, and a quench detector 3 for detecting a quench which has occurred in the superconducting coil 2. COPYRIGHT: (C)2012,JPO&INPIT ...

Coil node voltage outputs for superconducting magnets

Over-pressure limiting arrangement for a cryogen vessel

SUPERCONDUCTING MAGNET DEVICE

Transformer with a superconducitve current-limiting arangement

A transformer arrangement comprises a ferrous core 1 with two conductive windings 6, 7, 10 at least one of which is super-conducting. The windings 6, 7, 10 are wound on said core 1 with one winding having two parts 6, 7 wound on different parts of the core 2, 3 in series opposition. One of said winding parts 7 includes a super-conducting shield 8. The winding part 7 and the shield 8 are arranged to provide a current-limiting effect on over-current conditions. Either of the windings may be made of a conventional electrically conductive material (e.g. copper or aluminium). The transformer provides an electrical energy transfer interface which may be used between physically separate cables in which one of the cables is a conventional conductive cable and the other a superconductive cable or both cables may be superconductive. The core 1 may have three limbs and the shield 8 may be a cylindrical shape and may be driven into a resistive state by a coil formed around the cylinder.

Superconductor current leads

A high temperature superconducting (HTS) current lead comprises an HTS conductor 11 which is thermally and electrically connected to a shunt 21. When a quench event occurs, current flows through the shunt 21, via voltage taps 30 and 32, and generates heat in a quench heater 34 which is in thermal contact with a superconducting device 26. This results in a controlled quenching of the superconducting device 26 before a burn-out can occur. The shunt 21 may comprise stainless steel. A section of HTS 36 may be isothermal over its length and have a high heat capacity mass. The lead may be fully electrically shunted along its length with the shunt 21 soldered by an indium-based soldered. The first voltage tap 32 may be made of copper and the second voltage tap 30 may be made of brass, where the first tap 32 is at a lower temperature than the second tap 30. The voltage taps 30 and 32 may be made from an HTS material.

Method and apparatus for actively controlling quench protection of a superconducting magnet

Automatic burst disc replacement apparatus

A burst disc replacement apparatus 100 comprises a magazine 122 that carries a first burst disc (232, figure 2) and a second burst disc (234, figure 2). A flow path 104 passes through the apparatus 100 for venting fluid. The first burst disc (232, figure 2) is located in the flow path 104. A translation mechanism 112, 144, 146, 200, 214, 220, 222 is arranged to move the second burst disc (234, figure 2) into the flow path 104 in place of the first burst disc (232, figure 2) in response to an indication that fluid pressure at one side of the first burst disc (232, figure 2) has exceeded a predetermined pressure corresponding to rupture of the first burst disc (232, figure 2).

Improvements in or relating to arrangements comprising superconductive windings

... 1,059,938. Generators operating by electro-magnetic interaction with fluids. SIEMENSSCHUCKERTWERKE A.G. April 2, 1964 [Sept. 27, 1963], No. 13753/64. Addition to 1,053,217. Heading H2A. [Also in Division H1] In a superconductive arrangement comprising a superconductive winding inductively coupled to a cooled metal body constructed as a shortcircuit, additional means is provided for propagating any transition in operation of a part of the winding from the super-conductive to the normally conductive state to the remainder of the winding. This means may consist of a coating of metal of high heat conductivity such as copper or silver on the material of the winding. In Fig. 1 the winding comprises a series of pancake coils 1 made of coated foil interconnected by bridges 5 but spaced apart by insulated metal rings 7. The coils are mounted in two piece annulus 6a, 6b provided with cooling ducts 8, 9, 10 filled with liquid helium, nitrogen and water respectively. Alternatively cooling liquids containing ...

Superconducting solenoid

... 1,045,512. Super-conductor devices. RADIO CORPORATION OF AMERICA. Jan. 20, 1965 [Feb. 28, 1964], No. 2488/65. Heading H1K. As shown a superconductor magnet comprises a stack of thin discs 12 of thermally conductive material such as copper, gold, aluminium or silver, interleaved with thin discs 14 each comprising a platinum substrate 16 having concentric rings of niobium-tin alloy deposited on both of its faces, Fig. 7 (not shown). The stack is mounted in a press 24 and the assembly placed in an external magnetic field and cooled below the critical temperature of niobium-tin alloy. On removal of the external magnetic field the magnet retains a strong residual field as long as the temperature is maintained below the critical temperature. The niobium-tin rings may be produced by heating the substrate in an atmosphere of niobium chloride, tin chloride and hydrogen and dividing the deposited layers into rings by sandblasting, etching with hot alkali, or scratching away the superconductive material ...

FRUSTO-CONICAL SUPERCONDUCTING MAGNET FORMERS

A former for a superconducting magnetic coil 1, having a groove defined by walls 3a,3b one of which 3a is identified as a thrust plate, and a journal surface 4. The journal surface 4 is a frusto-conical surface, with the lesser diameter end of the journal base surface 4 being adjacent the thrust plate 3a. The coil 1 may be provided with a filler material 8 which is complimentary to the frusto-conical journal surface 4 to allow the coil 1 to be coaxial with the former. The former may also be provided with a coil clamp 10 and a protective layer 11 such that when the coil 1 and former differentially constrict due to cryogenic temperatures the coil 1 remains radially centred.

A METHOD OF DETECTING TRANSITIONS IN A SUPER-CONDUCTIVE COIL

... 1,242,897. Protective arrangements. SOC. GENERALE DE CONSTRUCTIONS ELECTRIQUES ET MECANIQUES ALSTHOM. 30 Sept., 1968 [29 Sept., 1967], No. 46397/68. Heading H2K. [Also in Division G1] To detect a transition in a superconductive coil from the superconducting to the resistive state so that the supply to the coil may be broken an auxiliary coil 1 is wound with the superconductive coil 2 so that the flux linking the two coils, and hence the reactive volt drops in them, are equal or at least proportional to one another, and the difference between the voltages across the two coils determined. This difference is proportional to the resistive volt drop in the superconducting coil, which may be many orders of magnitude smaller than the reactive volt drop. The two coils are connected together at the high voltage end A and at the other end are connected to a difference amplifier 4. The output of the amplifier 4 is compared in apparatus 10 with a voltage proportional to the current in the superconducting ...

PROTECTING SUPER CONDUCTIVE DEVICE

A CURRENT-LIMITING ARRANGEMENT

... 1,262,024. Excessive current protection. SIEMENS A.G. 25 June, 1970 [26 June, 1969], No. 30974/70. Addition to 1,163,027. Heading H2H. [Also in Division H1] An electrical current limiting arrangement has two parallel connected windings arranged so the resultant of the magnetic field is substantially zero at normal operating currents. One of the windings 1 consist entirely or partially of a superconductive material and has a critical current strength higher than the normal operating current and a preferably adjustable choke coil 5 connected in series. With a current which is lower than or equal to the critical current substantially same voltage drop is set up across the choke as across the second winding but when the current in the one winding exceeds the critical current it changes to a normally conductive state whereupon the inductance of the arrangement is increased. The windings, which are preferably tightly coupled to reduce stray fields, are enclosed in a heat insulating housing which ...

DEVICES AND SYSTEMS BASED ON NOVEL SUPERCONDUCTING MATERIAL

Superconducting copper oxides of the perovskite structure are modified to have mixed occupancy of a cation site, thereby resulting in increased limits in critical field and/or critical current. Mixed occupancy may be observed in terms of increased resistivity as the superconducting material reverts to a nonsuperconducting state. A significant advantage, at least for preferred compositions, derives from the fact that critical temperature is substantially unaffected relative to the prototypical material.

Device of concentration of magnetic flux superconductor

Sophisticated superconductive reel

PROCESS FOR the ASSEMBLY Of a SUPERCONDUCTIVE MAGNETIC ROLLING UP

A Method for Transferring Energy to a Conductive Medium and an Apparatus for the Implementation of the Method.

ACTIVE PROTECTION SYSTEM FOR A SUPERCONDUCTING MULTIPOLAR COIL ASSEMBLY

DEVICE FOR DETECTING QUENCH IN SUPERCONDUCTING COIL

A device for detecting quench in a superconducting coil according to one aspect of the present invention is provided with a first superconducting coil and a second superconducting coil connected in series. The first superconducting coil and the second superconducting coil have the same shape. A first axis of the first superconducting coil and a second axis of the second superconducting coil are disposed in the same position and in the same direction, and the position of the first superconducting coil is the same as the position of the second superconducting coil in the direction of the first and second axes. The length of the winding of the first superconductor coil is the same as the length of the winding of the second superconductor coil.

SUPERCONDUCTING FAULT CURRENT-LIMITER WITH VARIABLE IMPEDANCE SHUNT COIL

A superconducting fault current-limiter is provided, including a superconducting element configured to resistively or inductively limit a fault current, and one or more variable-impedance shunts electrically coupled in parallel with the superconducting element. The variable-impedance shunt(s) is configured to present a first impedance during a superconducting state of the superconducting element and a second impedance during a normal resistive state of the superconducting element. The superconducting element transitions from the superconducting state to the normal resistive state responsive to the fault current, and responsive thereto, the variable-impedance shunt(s) transitions from the first to the second impedance. The second impedance of the variable-impedance shunt(s) is a lower impedance than the first impedance, which facilitates current flow through the variable-impedance shunt(s) during a recovery transition of the superconducting element from the normal resistive state to the ...

Electromagnetic Pulse Source Using Quenching Superconducting Magnet

An electromagnetic pulse source comprises a superconducting magnet comprising a coil of superconducting material. At least a portion of the windings of the coil are separated by an electric conductor. A charging circuit is coupled to the two terminals to drive a current through the coil to charge the superconducting magnet and configured to charge the coil to a condition such that the coil enters a quench condition where current flows from one turn of the coil to another turn of the coil through the electric conductor. The quench event may cause a loss of inductance and resulting electromagnetic radiation. A receiver circuit comprising an inductive element is positioned so that the inductive element is mutually-coupled to the coil and the electromagnetic radiation causes a voltage to be induced across the inductive element.

Superconductive coil system with protecting device

A superconductive coil has both its terminals connected in parallel with a protecting device which has a diode and a unipolar d.c. motor connected in series with each other. The superconductive coil is further connected with an energizing d.c. power source through a switch. The conductive direction of the diode is so selected that the d.c. motor is driven by the energizing energy of the superconductive coil when the switch is opened in the quenching operation of the superconductive coil.

HYPERSONIC AIRCRAFT HAVING HOMOPOLAR MOTOR WITH GRADED RESISTANCE

A hypersonic aircraft having a homopolar motor with high temperature superconducting (HTS) non-insulated (NI) coil magnets is described. In some implementations, the HTS NI coil magnets can have a graded resistance design. In some implementations, the HTS NI coil magnets can include a series of stacked coils, each of the series of coils comprising multiple turns having turn-to-turn resistance, where the turn-to-turn resistance of the series of coils is graded coil-to-coil across the magnet. In some implementations, the HTS NI coil magnets can include an NI coil comprising multiple turns and two or more thermal barriers each disposed between two adjacent turns of the coil, where an electrically conductive portion of one of the thermal barriers does not overlap with an electrically conductive portion of a different adjacent one of the thermal barriers. Some implementations can include a disk-type homopolar motor/generator including one or more HTS NI coil magnets. 1. A hypersonic aircraft having a disk-type homopolar motor/generator , the disk-type homopolar motor/generator comprising:an electrically conductive metal disk;an electrically conductive shaft coupled, mechanically and electrically, to the electrically conductive metal disk;a first electrical contact configured to be in electrical contact with an edge of the electrically conductive metal disk;a second electrical contact configured to be in electrical contact with the electrically conductive shaft; and a plurality of NI coils each comprising multiple turns and', 'two or more thermal barriers each disposed between a different two adjacent turns of the NI coil, wherein an electrically conductive portion of one of the thermal barriers does not overlap with an electrically conductive portion of a different adjacent one of the thermal barriers,, 'a high temperature superconducting (HTS) non-insulated (NI) multi-coil magnet, comprisingwherein the HTS NI coil magnet is arranged so that a normal component of a ...

SUPERCONDUCTIVE MAGNET DEVICE

PROBLEM TO BE SOLVED: To obtain a superconductive magnet device for preventing damage to a coil container caused by the occurrence of a quench phenomenon, vacuum break or the like, when blocking by freezing is generated in a pipeline for connecting the coil container to the outside of a vacuum container. SOLUTION: The superconductive magnet device comprises the coil container 5 for accommodating a superconductive coil 3 and a liquefied refrigerant 10 for cooling the superconductive coil 3 to a critical point or smaller, the vacuum container 7 for performing the vacuum heat insulation of the coil container 5 from the outside by including the coil container 5, and the pipeline 15 whose one end communicates with the inside of the coil container 5 and the other end is located outside the vacuum container 7. A heating means 17 for heating the pipeline 15 is provided at least at one location of a part piped to the inside of the vacuum container 7 in the pipeline 5. Even if a constituent for causing ...

SUPERCONDUCTING MAGNET

PURPOSE: To prevent induction of quenching by housing a plurality of superconducting coils, a liquid helium sump, a supply pipe, and joint boxes disposed in the way of the supply pipe and a collection pipe, respectively, in a thermally insulating vacuum vessel and providing the collecting pipe, coupling between the superconductor and the joint box, independently for each coil. CONSTITUTION: Collecting pipes 5a, 5b, coupling between superconducting coils 2a, 2b and joint boxes, are provided independently for the coils 2a, 2b and a supply pipe, coupling between a liquid helium sump 3 and each coil 2a, 2b, is separated into supply pipes 4a, 4b on the coil 2a, 2b side and a supply pipe 4c on the liquid helium sump 3 side. A base 9 for securing a superconducting lead 6 connecting the coils 2a, 2b is disposed in the collecting pipe 5a, 5b. The lead wire 6 is secured to the base 9 which is then secured in the collecting pipe 5a, 5b along with the supply pipes 4a, 4b. COPYRIGHT: (C)1996,JPO ...

SUPERCONDUCTING MAGNET

PROBLEM TO BE SOLVED: To provide a superconducting magnet with which the performance of a freezer can be efficiently utilized. SOLUTION: The superconducting magnet is provided with a helium container 4 containing liquid helium; a superconducting coil 1 dipped and arranged in the liquid helium in the helium container; a radiation shield 5 provided so as to surround the helium container 4; a vacuum container 6 for surrounding the helium container and the radiation shield and having the inside maintained in a vacuum state; and a freezer 3 provided on the vacuum container side and refrigerating each of helium gases evaporated in the radiation shield and the helium container. The magnet is also provided with a heater 19 submerged and provided in the liquid helium in the helium container 4; a pressure measurement means 20 provided in the helium gas atmosphere in the helium container to measure the pressure of the helium container; and a pressure controller 22 for controlling the heater in response ...

SUPERCONDUCTION MAGNET DEVICE

PURPOSE: To provide a superconducting magnet device that secures a requested stability against expected disturbances. CONSTITUTION: In a superconducting magnet device with superconductor 2 of which either of a current lead 5 or a power supply 6 is connected, a connecting part 4 of superconductor 2 with either of the current lead 5 or the power supply 6 is arranged at the place either of more than the critical temperature or the critical magnetic field of the superconductor 2. COPYRIGHT: (C)1995,JPO ...

METHOD FOR DETERMINING TRANSIENT STABILITY OF FORCIBLE COOL TYPE SUPERCONDUCTING COIL

PURPOSE: To accurately determine presence or absence of quenching of a coil by drawing a condition that an error mode of a numeric value solution is not amplified even if a timing step is advanced as a method of simultaneously satisfying a fluid equation and a heat conduction equation, and obtaining temperature distribution of a conductor in spatial and timing manner, and setting a timing division according to it. CONSTITUTION: A sufficient condition that an error mode of a numeric value solution is not amplified even if a timing step is advanced is drawn, and whether a superconducting breakdown occurs or not is determined according to this when a coil is thermally disturbed. Thus, condition that Fourier mode of an error is not amplified in each timing step of a calculating process, i.e., △t≤△tmax* (≤tmax) is analytically obtained, a timing division is given by △t=α△tmax* (0<α<1) to eliminate a numerical instability, thereby performing determination of high accuracy and high reliability ...

PERMANENT CURRENT SWITCH

PURPOSE: To obtain a stable permanent current switch which has high current flowing performance by separating between layers on which an electromagnetic force is acted in a direction for repelling between adjacent layers of a superconductive winding for forming the switch without bonding with resin. CONSTITUTION: Spacers 4 made of a separating material such as a Teflon sheet are disposed between the second and the third layers and between the fourth and the fifth layers. Accordingly, they are separated therebetween, and even if an electromagnetic force of tensile direction is acted, tensile stress is hardly acted on the immersed resin, and a microcrack is hardly generated. Thus, a crack of the immersed resin which causes a factor of a quenching can be prevented, thereby improving and stabilizing the current flowing performance of the switch. COPYRIGHT: (C)1985,JPO&Japio ...

Verfahren zum Laden einer supraleitfähigen Magnetanordnung mit Strom

Ein Verfahren zum Laden einer einen supraleitfähigen Bandleiter mit einer ersten Sprungtemperatur umfassenden Magnetanordnung in einer Kryostat-Vorrichtung, umfasst: (a) Temperierung auf eine erste Vorlauftemperatur zwischen der ersten Sprungtemperatur und der Betriebstemperatur, (b) Erregung eines ersten Vorlaufstromes, (c) Abkühlen auf Betriebstemperatur (d) Erregung eines ersten Betriebsstromes, und ist dadurch gekennzeichnet, dass die Magnetanordnung eine zweite Magnetwicklung aus einem zweiten Supraleitermaterial mit einer zweiten Sprungtemperatur oberhalb der Betriebstemperatur und mindestens 15 K unterhalb der ersten Sprungtemperatur umfasst, wobei ein zweiter Betriebsstrom in der zweiten Magnetwicklung spätestens nach dem Abkühlen der Magnetanordnung auf die Betriebstemperatur erregt wird und die zweite Magnetwicklung mit dem zweiten Betriebsstrom ein zweites Betriebsmagnetfeld im Volumen der ersten Magnetwicklung erzeugt. Dadurch wird beim Laden von Magnetanordnungen mit kombinierten ...

Supraleitende Magnetanordnung mit Schalter

Eine supraleitende Magnetanordnung mit einer Magnetspule (1) mit Induktivität L, die in einem Kryostaten (7) auf kryogener Temperatur angeordnet ist, zum Erzeugen eines zeitlich stabilen, für NMR-Messungen geeigneten Magnetfeldes in einem Arbeitsvolumen, und mit Stromzuleitungen zu einer externen Stromquelle (3), über die ein Strom mit Stromstärke I¶PS¶ zugeführt werden kann, wobei die Magnetspule (1) auf kryogener Temperatur ausschließlich über einen Schalter (5) kurzschließbar ist, ist dadurch gekennzeichnet, dass der Schalter (5) normalleitend ist und eine mechanisch betätigbare Brücke (6) mit einem vorgebbaren ohmschen Widerstand R1 umfasst. Mit der erfindungsgemäßen Magnetanordnung kann mit geringem technischen Aufwand auch bei hohen Strömen (> 1000 A) ein stabiler Dauerbetrieb über ein Netzgerät gewährleistet und im Quenchfall frei werdende Energie effektiv abgeführt werden.

Verfahren zur Erzeugung hoher magnetischer Felder mit einer supraleitenden Spulenanordnung und dazu zu verwendende Spulenanordnung

Schalenanordnung aus Verbundlaminat für Anwendung in Magneten

Supraleitende Magnetspule

Quench protection arrangement for a superconducting magnet

A superconducting magnet quench protection circuit 30 or method of protection comprises at least one heater R1 - R6 connected in series with an inductor 36 which drives the heater R1 - R6 by a voltage derived from the variation in the magnetic field produced by the said magnet. Respective heaters R1 - R6 may be associated with corresponding coils of the superconducting magnet L1 - L6. A positive temperature coefficient resister and / or a diode may be connected in series with the heater arrangement. The quench protection arrangement can provide a compact, high current, rapid quench arrangement for superconducting coils used in superconducting magnets of magnetic resonance imaging (MRI) systems.

Устройство магнитной катушки из втсп 2 ленты

Полезная модель относится к устройствам магнитных катушек, изготовленных из ВТСП 2 ленты, предназначенных для создания магнитных систем с левитирующими катушками, для обмоток сверхпроводниковых электрических машин, для создания магнитов, для ЯМР томографов, а также для накопителей энергии. Основное преимущество таких катушек состоит в том, они работают при температуре жидкого азота. Устройство магнитной катушки из ВТСП 2 ленты, характеризующееся тем, что содержит несколько, не менее двух, вложенных соосно друг в друга катушек, каждая из которых выполнена из ВТСП 2 ленты, причем намотанной в две галеты, концы ленты коротко соединены на внешнем диаметре катушки с помощью спая, пространство между вложенными катушками заполнено лентой из пластика, намотанной на внутреннюю катушку, соленоид с источником питания для возбуждения тока в катушке, стакан из пластика, вставленный внутрь соленоида, для размещения в нем катушки при возбуждении в ней тока, корыто из пластика с жидким азотом для вставки катушек друг в друга после возбуждения в них тока. Устройство позволяет увеличить максимальный магнитный поток, захваченный катушкой при возбуждении в ней тока, изменять профиль распределения величины магнитного поля по радиусу катушки с помощью изменения величины и направления тока во вложенных катушках, ликвидировать отклонение оси магнитного поля катушки от геометрической оси катушки. Использование вложенных катушек дает экономический эффект. 5 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 205 644 U1 (51) МПК H01F 6/06 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H01F 6/06 (2021.05) (21)(22) Заявка: 2021110678, 16.04.2021 (24) Дата начала отсчета срока действия патента: Дата регистрации: 26.07.2021 (45) Опубликовано: 26.07.2021 Бюл. № 21 2 0 5 6 4 4 R U (56) Список документов, цитированных в отчете о поиске: RU 2579457 C1, 10.04.2016. RU 2491674 C2, 27.08.2013. US 5668090 A, 16.09.1997. М.В. Козинцева, А.М. Бишаев, ...

Precursor for a Nb3Sn superconductor wire, method for manufacturing the same, Nb3Sn superconductor wire, and superconducting magnet system

A precursor for a Nb 3 Sn superconductor wire to be manufactured by the internal diffusion method. The precursor includes Nb-based single core wires, Sn-based single core wires, and a cylindrical diffusion barrier made of Ta or Nb. Each Nb-based single core wire includes a Nb-based core coated with a Cu-based coating made of a Cu-based matrix. Each Sn-based single core wire includes a Sn-based core coated with a Cu-based coating made of a Cu-based matrix. The Nb-based single core wires and the Sn-based single core wires are regularly disposed in the diffusion barrier. The Nb-based single core wires includes at least two kinds of Nb-based single core wires having different Cu/Nb ratios and the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.

Apparatus and method for protecting a magnetic resonance imaging magnet during quench

A superconducting magnet assembly comprising a plurality of superconducting magnet coil portions forming a coil series circuit to provide a magnetic field, a power supply to supply power to the plurality of superconducting magnet coil portions during a magnet ramp mode of operation, and a ramp switch coupled to the superconducting magnet coil portions, wherein the ramp switch is configured to be open during a magnet ramp mode and closed during a persistent mode. A dump resistor is disposed externally to the vessel and is connectable by the ramp switch to the superconducting magnet coil portions. Further, a controller is coupled to at least one superconducting magnet coil portion and the ramp switch and is configured to detect a quench onset condition in the at least one superconducting magnet coil portion and to open the ramp switch upon detection of the quench onset condition in order to dump magnet energy.

SUPERCONDUCTING COIL, ROTATING DEVICE, AND SUPERCONDUCTING COIL MANUFACTURING METHOD

A superconducting coil and a rotating device, the performances of which are improved, and a superconducting coil manufacturing method are provided. A superconducting coil is a saddle-shaped superconducting coil formed by winding a superconducting wire so as to form a race-track-like shape. The superconducting coil includes a curved portion and a straight portion connected to the curved portion . In the curved portion , an upper edge is positioned closer to an inner peripheral side than a lower edge is, and in the straight portion , the upper edge is positioned closer to an outer peripheral side than the lower edge is. 1. A saddle-shaped superconducting coil formed by winding a superconducting wire so as to form a race-track-like shape , the superconducting coil comprising:a curved portion; anda straight portion connected to the curved portion,wherein, in the curved portion, an upper edge is positioned closer to an inner peripheral side than a lower edge is, andwherein, in the straight portion, the upper edge is positioned closer to the outer peripheral side than the lower edge is.2. A rotating device comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the superconducting coil according to .'}3. A superconducting coil manufacturing method comprising the steps of:preparing a base having a cylindrical surface;arranging a race-track-like winding frame having a saddle shape on the cylindrical surface of the base; andwinding a superconducting wire on the cylindrical surface of the base along the winding frame,wherein the winding frame has a curved portion and a straight portion connected to the curved portion,wherein, in the curved portion, an upper edge is positioned closer to an inner peripheral side than a lower edge is, and in the straight portion, the upper edge is positioned closer to the outer peripheral side than the lower edge is. The present invention relates to a superconducting coil, a rotating device, and a superconducting coil manufacturing method. ...

ASSEMBLY FOR MAGNETIZATION OF RARE-EARTH PERMANENT MAGNETS

A superconducting magnetizer assembly includes a coil pack including an inner coil configured to generate a first magnetic field in response to an electric current supplied to the inner coil, an outer coil being disposed about the inner coil and configured to generate a second magnetic field in response to an electric current supplied to the outer coil, a non-conductive end spacer disposed between an end winding of the inner coil and an end winding of the outer coil, and a container to house the inner and outer coils; and a yoke disposed proximate the coil pack being configured to constrain the first and second magnetic fields to reduce the strength of the first field at the end winding of the inner coil, wherein the yoke comprises an annular ring configured to at least partially envelop the coil pack. 1. A superconducting magnetizer assembly , comprising:a coil pack, comprising an inner coil comprising a first superconducting magnet material, the inner coil being configured to generate a first magnetic field in response to an electric current supplied to the inner coil, an outer coil comprising a second superconducting magnet material, the outer coil being disposed about the inner coil and being configured to generate a second magnetic field in response to an electric current supplied to the outer coil, a non-conductive end spacer disposed between an end winding of the inner coil and an end winding of the outer coil, and a container configured to house the inner and outer coils; anda yoke disposed proximate the coil pack being configured to constrain the first and second magnetic fields to reduce the strength of the first field at the end winding of the inner coil, wherein the yoke comprises an annular ring configured to at least partially envelop the coil pack.2. The assembly of claim 1 , wherein the yoke comprises iron or permendur.3. The assembly of claim 1 , wherein the first superconducting magnet material and the second superconducting magnet material are the ...

HIGH-TEMPERATURE SUPERCONDUCTOR MAGNET SYSTEM

The invention relates to a high-temperature superconductor (HTS) magnet system, preferably for an insertion device for generation of high-intensity synchrotron radiation, consisting of the coil body (), on the mantle surface of which poles with windings that lie between them are disposed, wherein at least one high-temperature superconductor strip () is wound onto the coil body () in one direction, and adjacent winding packages or sections are electrically connected with one another in such a manner that the current flow runs in opposite directions, in each instance. The solution according to the invention has the advantage of a simplified winding process, whereby individual coil pairs can be replaced, if necessary, by means of the modular arrangement. The scheme can be applied to every possible configuration of an insertion device, and is therefore also suitable for use in so-called free electron lasers and other light sources based on particle accelerators. Furthermore, complicated cooling is eliminated, so that safety problems caused by lack of cooling cannot occur. 17-. (canceled)86. High-temperature superconductor (HTS) magnet system , preferably for an insertion device for generation of high-intensity synchrotron radiation , consisting of the coil body () , on the mantle surface of which poles with windings that lie between them are disposed , wherein{'b': 21', '22', '6, 'field-reinforcing poles (, ) are disposed coaxially on the coil body (),'}{'b': 23', '6', '22', '13', '21, 'at least one HTS conductor strip pair () is wound onto the coil body () between the poles (), to form an HTS winding package (), between which package another pole () is disposed,'}{'b': '13', 'adjacent HTS winding packages () or sections are electrically connected with one another in such a manner that the current flow runs in opposite directions, in each instance.'}9232016. HTS magnet system according to claim 8 , wherein at least two HTS conductor strip pairs () are connected with one ...

CRYOGENIC POWER CONTROL

An apparatus comprising a cryogenic chamber and a galvanic input interface to the cryogenic chamber configured to receive a lower amplitude electric current A converter is located within the cryogenic chamber and configured to convert the lower amplitude electric current provided by the galvanic input interface to a higher amplitude electric current for supply to a load within the cryogenic chamber A controller is configured to control the converter and to detect the onset of quench by comparing the duration of the charge/discharge cycle of the convertor with a stored value. The controller may also compare an instantaneous value of load current with a stored value of load current. 1. An apparatus comprising:a cryogenic chamber;a device for storing electric charge located within the chamber, the device being connected to an interface on the exterior of the chamber and to a load within the chamber, wherein the device operates according to predetermined charge and discharge cycles such that energy is stored and subsequently transferred to the load in a successive manner in use; and,a controller configured to monitor the charge and/or discharge cycle of the device in order to determine the onset of an adverse operating condition within the chamber.2. An apparatus according to claim 1 , wherein the adverse condition is a quench condition.3. An apparatus according to claim 1 , wherein the device is arranged to transfer a predetermined quantum of energy to the load during each discharge cycle.4. An apparatus according to claim 1 , wherein the controller monitors the duration of a charge and/or discharge cycle of the device.5. An apparatus according to claim 4 , wherein the controller compares an instantaneous duration of the charge and/or discharge cycle of the device with a stored duration value.6. An apparatus according to claim 1 , wherein the controller is arranged to monitor the current on the load.7. An apparatus according to claim 6 , wherein the load comprises a ...

SUPERCONDUCTING MAGNET DEVICE AND MAGNETIC RESONANCE IMAGING SYSTEM

A superconducting magnet device and a magnetic resonance imaging system not only avoid the need for costly aluminum alloy formers but also lower quench pressure effectively, have a baffle covering the former and the coil, with a gap between the baffle and the coil. 1. A superconducting magnet device , comprising:a first former;a first coil formed by the superconducting wire wound on the first former; anda baffle covering the first former and the first coil, with a gap between the baffle and the first coil.2. Superconducting magnet device according to claim 1 , comprising:a second former around the outside of the first former and the first coil;a second coil formed by the superconducting wire wound on the second former; anda frame between the first former and the second former, that supports the second former and making the second former fixed relative to the first former.3. Superconducting magnet device according to claim 2 , further comprising:a further baffle covering the second former and the second coil, with a gap between the further baffle and the second coil.4. Superconducting magnet device according to claim 3 , wherein the further baffle is set with multiple holes.5. Superconducting magnet device according to claim 4 , wherein the multiple holes are distributed on the further baffle uniformly.6. Superconducting magnet device according to claim 4 , wherein the further baffle is a plate made from non-metallic material.7. Superconducting magnet device according to claim 6 , wherein the non-metallic material is glass fiber reinforced plastic.8. Superconducting magnet device according to claim 2 , wherein the frame connects the first former and the second former by bolts claim 2 , welding claim 2 , screws or rivets.9. Superconducting magnet device according to claim 2 , wherein the first former and the second former are made from the aluminium 5083 or aluminium AC4A or a similar aluminium alloy.10. Superconducting magnet device according to claim 1 , wherein the ...

Compact Superconducting Magnet Device

Disclosed is a compact superconducting magnet device for generating an intense and homogeneous magnetic field component Bz along an axis Oz in a zone of interest ZI successively includes, starting from the axis Oz, at least three coaxial superconducting helical coils formed around circular cylinder sections of axis Oz delimited by end circles. The lateral ends of the helical coils are arranged, to within the thickness of the coils, in the vicinity of one same sphere of radius c whose centre O is placed on the axis Oz at the centre of the zone of interest ZI and which encompasses the magnetic device assembly. The azimuthal current densities j, j, jof the helical coils are alternately of opposite sign. The lengths of the helical coils are of decreasing length. 111011011010101101101101221022012020201201201011021022121011025105310330130303013013020120310322221231011021033104110111013104bbbbbb. A compact superconducting magnet device to generate a homogeneous magnetic field component Bz along an axis Oz in a zone of interest (ZI) for nuclear magnetic resonance or magnetic resonance imaging applications , successively comprising , starting from the axis Oz and perpendicular to this axis Oz , at least one first superconducting helical coil (; ) formed around a first circular cylinder section (; ) of axis Oz delimited by first end circles (A , B; A , B) , said first superconducting helical coil (; ) having a first outer radius (a) , a first inner radius (a) , and a first length () , with a first azimuthal current density j , at least one second superconducting helical coil (; ) formed around a second circular cylinder section (; ) of axis Oz delimited by second end circles (A , B; A , B) and surrounding said first circular cylinder section (; ) , said second coil (; ) having a second outer radius (a) , a second inner radius (a) and a second length () , with a second azimuthal current density j , characterized in that the lateral ends of the first and second helical coils ( ...

Quench Detection System for Superconducting Magnets

A quench detection device (or method) is provided that receives real-time information of concurrently monitored electrical characteristics of a high temperature superconducting (HTS) device, or any superconducting material, device, or system including low temperature superconductors, during operation. The quench detection device determines whether an electrical threshold is satisfied based on the received real-time information. The quench detection device detects a quench condition if the electrical threshold remains satisfied over a predetermined period of time or a predetermined successive number of times. If a quench detection is detected, the quench detection device sends a signal to terminate the operation of the HTS device. 1. A method of detecting quench in a superconducting device , the method comprising:receiving real-time information of concurrently monitored electrical characteristics of a superconducting device in operation;determining whether an electrical threshold is satisfied based on the received real-time information; anddetecting a quench condition if the electrical threshold remains satisfied over a predetermined period of time or a predetermined successive number of times.2. The method according to claim 1 , wherein the electrical threshold is a voltage threshold.3. The method according to claim 2 , wherein the determining operation comprises:comparing a voltage difference to the voltage threshold in order to determine whether an electrical threshold is satisfied, the voltage difference being a difference between two voltage measurements obtained based on the monitored electrical characteristics at an instance in time.4. The method according to claim 3 , wherein the voltage measurements are of an inductive voltage or a resistive voltage.5. The method according to claim 2 , wherein the superconducting device comprises a superconducting coil having at least a first portion and a second portion claim 2 , the method further comprising:ascertaining a ...

SUPERCONDUCTING COIL, SUPERCONDUCTING MAGNET, AND METHOD FOR MANUFACTURING SUPERCONDUCTING COIL

An inner circumferential portion is formed by winding one of first and second superconducting wires each having a band shape. An outer circumferential portion is formed by winding the other of the first and second superconducting wires around the inner circumferential portion. A welding portion joins the first and second superconducting wires to each other by welding between the inner circumferential portion and the outer circumferential portion. The first superconducting wire is higher in strength than the second superconducting wire. The second superconducting wire is smaller in thickness than the first superconducting wire. 1. A superconducting coil having an oxide superconductor , comprising:an inner circumferential portion formed by winding one of first and second superconducting wires each having a band shape;an outer circumferential portion formed by winding the other of said first and second superconducting wires around said inner circumferential portion; anda welding portion joining said first and second superconducting wires to each other by welding between said inner circumferential portion and said outer circumferential portion,said first superconducting wire being higher in strength than said second superconducting wire, and said second superconducting wire being smaller in thickness than said first superconducting wire.2. The superconducting coil according to claim 1 , whereinsaid inner circumferential portion is formed by winding said first superconducting wire, and said outer circumferential portion is formed by winding said second superconducting wire.3. The superconducting coil according to claim 1 , whereinsaid first and second superconducting wires joined to each other by said welding portion are wound to form a racetrack shape having a straight portion and a curved portion, and at least a part of said welding portion is located at said curved portion.4. The superconducting coil according to claim 3 , whereinsaid welding portion is located only ...

METHOD AND APPARATUS FOR ORDERLY RUN-DOWN OF SUPERCONDUCTING MAGNETS

In a method and apparatus for maintaining operation of ancillary equipment associated with a superconducting magnet carrying a DC current, the DC current is directed through a DC-to-AC converter, and the magnitude of the current flowing through the superconducting magnet is ramped down at a controlled rate, thereby generating a controlled voltage across a controlled impedance, and powering the ancillary equipment by the controlled voltage and an associated current, and the ramping rate is controlled in order to maintain a required controlled voltage. 1. A method for maintaining operation of a cryogenic refrigerator powered by an electrical power source and used for cooling a superconducting magnet carrying a DC current , comprising the steps of:detecting a failure of the electrical power source, and in response to the detection of the failure of the electrical power source, performing the following steps to ensure an orderly run-down of the superconducting magnet in advance of a possible quench:directing the DC current through a DC to AC converter;ramping down the magnitude of the current flowing through the superconducting magnet at a controlled ramping rate, thereby generating a controlled power from the DC to AC converter;powering the cryogenic refrigerator by the controlled power; andcontrolling the ramping rate in order to maintain a required controlled power.2. A method according to wherein the step of controlling the ramping rate comprises increasing the ramping rate as the magnitude of current flowing in the magnet decreases.3. A method according to wherein the step of powering the cryogenic refrigerator continues until substantially all of the energy stored in the magnet had been dissipated in operating the refrigerator.4. Apparatus for maintaining operation of a cryogenic refrigerator powered by an electrical power source and used for cooling a superconducting magnet carrying a DC current claim 1 , comprising:a DC to AC converter;a detector configured to ...

METHOD FOR MANUFACTURING SUPERCONDUCTING WIRE, AND SUPERCONDUCTING WIRE

A method for manufacturing a superconducting wire material in which the superconducting current is not saturated even when a superconducting layer is made into a thick film, and a superconducting wire material. In the method a superconducting layer is formed on a metal substrate interposed by an intermediate layer, the method including heating the metal substrate up to the film-formation temperature of a superconducting film for forming the superconducting layer, forming a superconducting film having a film thickness of at least 10 nm and no more than 200 nm on the intermediate layer, and reducing the metal substrate temperature to a level below the film-formation temperature of the superconducting film, and the superconducting film-formation, including the heating, the film-formation, and the cooling, are performed a plurality of times. 1. A method for manufacturing a superconducting wire in which a superconducting layer is formed above a metallic substrate with an intermediate layer in between , the method comprising:heating the metallic substrate to a film deposition temperature of a superconducting thin film which forms the superconducting layer;depositing the superconducting thin film with a film thickness of 10 nm or more and 200 nm or less on the intermediate layer; andcooling the metallic substrate temperature below the film deposition temperature of the superconducting thin film,wherein forming the superconducting thin film which includes the heating, the depositing, and the cooling is performed plural times.2. The method for manufacturing the superconducting wire according to claim 1 , wherein a temperature of heating the metallic substrate in the heating is 700° C. or higher and 900° C. or lower.3. The method for manufacturing the superconducting wire according to claim 1 , wherein the superconducting thin film is formed by Metal Organic Chemical Vapor Deposition.4. A superconducting wire comprising:a metallic substrate;a superconducting layer formed ...

HIGH-TEMPERATURE SUPERCONDUCTING COIL AND SUPERCONDUCTING DEVICE

A high-temperature superconducting coil according to the invention includes an oxide superconducting wire including a tape-shaped substrate, an intermediate layer being stacked on the substrate, an oxide superconducting layer being stacked on the intermediate layer, and a metal stabilized layer being stacked on the oxide superconducting layer; a coil main body being formed by winding the oxide superconducting wire in a coil shape; and an impregnated resin layer being formed of an impregnated resin of which a thermal shrinkage rate indicating a rate of change of a length when cooling is performed from 293 K to 140 K is greater than or equal to −0.517%, the impregnated resin layer covering the coil main body. 1. A high-temperature superconducting coil comprising: a tape-shaped substrate,', 'an intermediate layer being stacked on the substrate,', 'an oxide superconducting layer being stacked on the intermediate layer, and', 'a metal stabilized layer being stacked on the oxide superconducting layer;, 'an oxide superconducting wire material comprisinga coil main body being formed by winding the oxide superconducting wire material in a coil shape; andan impregnated resin layer being formed of an impregnated resin of which a thermal shrinkage rate indicating a rate of change of a length when cooling is performed from 293 K to 140 K is greater than or equal to −0.517%, the impregnated resin layer covering the coil main body.2. The high-temperature superconducting coil according to claim 1 , whereinfiller particles are contained in the impregnated resin layer in a range of 47% by volume to 80% by volume.3. The high-temperature superconducting coil according to claim 2 , whereina particle diameter of the filler particles is less than or equal to 12 μm.4. The high-temperature superconducting coil according to claim 1 , whereinthe impregnated resin layer is formed of a resin having a coefficient of viscosity of less than or equal to 560 mPa·s at 60° C.5. A superconducting ...

SUPERCONDUCTING COIL PRODUCTION APPARATUS AND SUPERCONDUCTING COIL PRODUCTION METHOD

According to an embodiment, a superconducting coil production device for producing a non-coplanar three-dimensional superconducting coil by winding a tape-like superconducting wire includes: a coil bobbin; a supply reel to supply the superconducting wire to the coil bobbin; and an adjustment driving unit to adjust a position of the supply reel relative to a wrapping point so that a position of the wrapping point of the coil bobbin around which the superconducting wire being supplied from the supply reel is wrapped becomes equal to a position of the supply reel in a rotational axis direction of the supply reel. 1. A superconducting coil production apparatus that produces a non-coplanar three-dimensional superconducting coil by winding a tape-like superconducting wire , the apparatus comprising:a coil bobbin around which the superconducting wire is wound;a rotary driving unit to rotate the coil bobbin around a coil axis of the superconducting coil;a supply reel to supply the superconducting wire to the coil bobbin; andan adjustment driving unit to adjust a position of the supply reel relative to a wrapping point so that a position of the wrapping point of the coil bobbin around which the superconducting wire being supplied from the supply reel is wrapped is kept the same position as the position of the supply reel in a rotational axis direction of the supply reel.2. The superconducting coil production apparatus according to claim 1 , whereinthe superconducting coil is made by stacking the tape-like superconducting wire in a thickness direction.3. The superconducting coil production apparatus according to claim 1 , wherein:the supply reel is provided in such a way that a rotation axis thereof is parallel to a coil axis of the superconducting coil; andthe adjustment driving unit makes an adjustment by driving a position of at least the supply reel or coil bobbin in a rotational axis direction of the supply reel.4. The superconducting coil production apparatus according ...

SYSTEM AND METHOD FOR OPERATING A BULK SUPERCONDUCTOR DEVICE

An apparatus includes a chamber and a bulk superconductor disposed within the chamber. The apparatus also includes a heating element coupled to the bulk superconductor. 1. A bulk superconductor device comprising:a chamber;a bulk superconductor disposed within the chamber; anda heating element coupled to the bulk superconductor.2. The bulk superconductor device of claim 1 , wherein the heating element is disposed within the chamber claim 1 , and wherein the chamber comprises a cryogenic chamber.3. The bulk superconductor device of claim 1 , wherein the chamber claim 1 , the bulk superconductor claim 1 , and the heating element are included in a superconductor magnetic energy storage (SMES) system.4. The bulk superconductor device of claim 1 , further comprising an electrically conductive coil located within the chamber claim 1 , wherein the electrically conductive coil is configured to generate claim 1 , responsive to current through the electrically conductive coil claim 1 , a magnetic field.5. The bulk superconductor device of claim 1 , further comprising a reinforcement structure coupled to the bulk superconductor.6. The bulk superconductor device of claim 1 , further comprising:a second bulk superconductor disposed within the chamber; anda second heating element coupled to the second bulk superconductor.7. The bulk superconductor device of claim 1 , wherein the heating element is proximate to a first side of the bulk superconductor claim 1 , and further comprising a second heating element proximate to a second side of the bulk superconductor claim 1 , wherein the second side is opposite the first side.8. The bulk superconductor device of claim 1 , wherein the chamber includes nitrogen.9. The bulk superconductor device of claim 1 , further comprising a cooling element configured to conductively cool the bulk superconductor.10. The bulk superconductor device of claim 8 , further comprising a second bulk superconductor disposed within the chamber.11. A method of ...

RAPID DUMP OF PARTIALLY INSULATED SUPERCONDUCTING MAGNET

An HTS magnet system comprising an HTS field coil and a power supply. The HTS field coil comprises a plurality of turns comprising HTS material and a metallic stabiliser; and an electrically conductive layer separating the turns, such that current can be shared between turns via the conductive layer. The power supply is configured to: during ramp-up of the HTS field coil, provide a first current to the HTS field coil; and during ramp-down of the HTS field coil, provide a second current to the HTS field coil opposite in direction to the first current. 1. A high temperature superconductor , HTS , magnet system comprising an HTS field coil and a power supply , wherein: a plurality of turns comprising HTS material and a metallic stabiliser;', 'an electrically conductive layer separating the turns, such that current can be shared between turns via the conductive layer;, 'the HTS field coil comprises during ramp-up of the HTS field coil, to provide a first current to the HTS field coil', 'during ramp-down of the HTS field coil, to provide a second current to the HTS field coil opposite in direction to the first current., 'the power supply is configured to2. An HTS magnet system according to claim 1 , and comprising:a quench detection system configured to detect a quench in the HTS material and/or to detect conditions likely to cause a quench in the HTS material;wherein the power supply is configured to ramp down the HTS field coil in response to detection of a quench or conditions likely to cause a quench by the quench detection system.3. An HTS magnet system according to claim 1 , wherein the second current is a DC current.4. An HTS magnet system according to claim 1 , wherein the second current is a combination of a DC and an AC current claim 1 , such that the current varies sinusoidally with an average value opposite in sign to the first current claim 1 , and a period less than a time constant of the HTS field coil.5. An HTS magnet system according to claim 1 , wherein ...

HYPERSONIC AIRCRAFT HAVING HOMOPOLAR MOTOR WITH GRADED RESISTANCE

A hypersonic aircraft having a homopolar motor with high temperature superconducting (HTS) non-insulated (NI) coil magnets is described. In some implementations, the HTS NI coil magnets can have a graded resistance design. In some implementations, the HTS NI coil magnets can include a series of stacked coils, each of the series of coils comprising multiple turns having turn-to-turn resistance, where the turn-to-turn resistance of the series of coils is graded coil-to-coil across the magnet. In some implementations, the HTS NI coil magnets can include an NI coil comprising multiple turns and two or more thermal barriers each disposed between two adjacent turns of the coil, where an electrically conductive portion of one of the thermal barriers does not overlap with an electrically conductive portion of a different adjacent one of the thermal barriers. Some implementations can include a disk-type homopolar motor/generator including one or more HTS NI coil magnets. 1. A hypersonic aircraft having a disk-type homopolar motor/generator , the disk-type homopolar motor/generator comprising:an electrically conductive metal disk;an electrically conductive shaft coupled, mechanically and electrically, to the electrically conductive metal disk;a first electrical contact configured to be in electrical contact with an edge of the electrically conductive metal disk;a second electrical contact configured to be in electrical contact with the electrically conductive shaft; anda high temperature superconducting (HTS) non-insulated (NI) coil magnet, comprising:a series of coils that are stacked, each of the series of coils comprising multiple turns having turn-to-turn resistance, where the turn-to-turn resistance of the series of coils is graded coil-to-coil across the HTS NI coil magnet,wherein the HTS NI coil magnet is arranged so that a normal component of a magnetic field generated by the HTS NI coil magnet is substantially perpendicular to a face of the metal disk.2. The ...

Low-Resistance Connection Body for High-Temperature Superconducting Wire Material and Connection Method

Provided is a low-resistance connection body for a high-temperature superconducting wire, in which a high-temperature superconducting bulk body and a high-temperature superconducting wire including a high-temperature superconducting layer are connected to each other, wherein a melting point of the high-temperature superconducting layer is higher than a melting point of the high-temperature superconducting bulk body; the high-temperature superconducting layer and the high-temperature superconducting bulk body are in contact at a connection site of the high-temperature superconducting wire and the high-temperature superconducting bulk body; and a surface of the high-temperature superconducting bulk body that is in contact with the high-temperature superconducting layer is crystallized due to crystal growth. Two high-temperature superconducting wires can be connected, with low resistance, through connection of the two high-temperature superconducting wires to one high-temperature superconducting bulk. 1. A low-resistance connection body for a high-temperature superconducting wire , in which a high-temperature superconducting bulk body and a high-temperature superconducting wire including a high-temperature superconducting layer are connected to each other , whereina melting point of the high-temperature superconducting layer is higher than a melting point of the high-temperature superconducting bulk body;the high-temperature superconducting layer and the high-temperature superconducting bulk body are in contact at a connection site of the high-temperature superconducting wire and the high-temperature superconducting bulk body; anda surface of the high-temperature superconducting bulk body that is in contact with the high-temperature superconducting layer is crystallized due to crystal growth.2. The low-resistance connection body for a high-temperature superconducting wire according to claim 1 , wherein{'sub': 2', '3', '7-δ, 'the high-temperature superconducting layer ...

SUPERCONDUCTOR AND METHOD FOR MANUFACTURING SAME

According to an embodiment, a superconductor includes a base member, and a superconducting layer provided on the base member. The superconducting Layer has a first surface on the base member side, and a second surface on the side opposite to the first surface. The lattice constant of the base member substantially matches the lattice constant of the superconducting layer. The superconducting layer includes REAREBBaCuO. The x is not less than 0.01 and not more than 0.40. The z is not less than 0.02 and not more than 0.20. The REA includes at least one of Y, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Lu. The REB includes at least one of Nd or Sm. The superconducting layer includes a first surface-side region including a portion of the first surface. The first surface-side region includes a first region having an orientation property, and a second region. 1. A superconductor , comprising:a base member; anda superconducting layer provided on the base member,the superconducting layer having a first surface on the base member side, and a second surface on a side opposite to the first surface,a lattice constant of the base member substantially matching a lattice constant of the superconducting layer,{'sub': 1-x', 'x', '2', '3', '7-z, 'the superconducting layer including REAREBBaCuO,'}the x being not less than 0.01 and not more than 0.40,the z being not less than 0.02 and not more than 0.20,the REA including at least one of Y, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Lu,the REB including at least one of Nd or Sm,the superconducting layer including a first surface-side region including a portion of the first surface,a thickness of the first surface-side region along a first direction being 70% of an average thickness of the superconducting layer along the first direction, the first direction being from the first surface toward the second surface,a length of the first surface-side region along a second direction parallel to the first surface being 2 micrometers, a first region having an ...

DIRECTIONAL OVERCURRENT RELAY USING SUPERCONDUCTING FAULT CURRENT LIMITER VOLTAGE AND METHOD FOR CORRECTING THE SAME

Provided is a directional overcurrent relay using a superconducting fault current limiter voltage as a relay element, and a method for correcting the same. The directional overcurrent relay using a superconducting fault current limiter voltage as a relay element includes: a current measuring circuit measuring a current of a line connected from a system power source to a load, a voltage measuring circuit measuring a voltage at both ends of a superconducting fault current limiter connected to the line, and a correcting circuit correcting a tripping time Tby using a fault current Ithat is the current of the line and a superconducting fault current limiter voltage Vthat is the voltage at both ends of the superconducting fault current limiter and the tripping time Tis maintained consistently regardless of whether the superconducting fault current limiter operates or not. 1. A directional overcurrent relay using a superconducting fault current limiter voltage as a relay element , the directional overcurrent relay comprising:a current measuring circuit measuring a current of a line connected from a system power source to a load;a voltage measuring circuit measuring a voltage at both ends of a superconducting fault current limiter connected to the line; and{'sub': trip', 'f', 'SFCL', 'trip, 'a correcting circuit correcting a tripping time Tby using a fault current Ithat is the current of the line and a superconducting fault current limiter voltage Vthat is the voltage at both ends of the superconducting fault current limiter and the tripping time Tis maintained consistently regardless of whether the superconducting fault current limiter operates or not.'}2. The directional overcurrent relay of claim 1 , wherein the correcting circuit calculates a characteristic variable M allowing a decreased amount of the fault current Idue to the operation of the superconducting fault current limiter to be compensated by the superconducting fault current limiter voltage V claim 1 , and ...

MECHANICAL SUPERCONDUCTING SWITCH

A mechanically operating superconducting switch has two superconducting wires, a respective end of each superconducting wire being embedded in a respective block of superconducting material. A mechanical arrangement is provided for driving respective contact surfaces of the blocks into physical contact with each other, and for separating those services. 1. A mechanically operating superconducting switch comprising two superconducting wires , a respective end of each superconducting wire being embedded in a respective block of superconducting material , and a mechanical arrangement for driving respective contact surfaces of the two blocks into physical contact with one another , and for separating them.2. A mechanically operating superconducting switch according to wherein the superconducting wires are ends of coils forming a superconducting magnet.3. A mechanically operating superconducting switch according to wherein the mechanical arrangement provides linear actuation for driving the two blocks into mechanical contact with one another claim 1 , and for separating them.4. A mechanically operating superconducting switch according to wherein the mechanical arrangement provides rotary actuation for driving the two blocks into mechanical contact with one another claim 1 , and for separating them.5. A mechanically operating superconducting switch according to any preceding claim 1 , wherein at least one of the blocks is formed using a superconducting material in which a corresponding superconducting wire is embedded claim 1 , the superconducting material of the at least one block having a ductility greater than a ductility of the superconducting material of the superconducting wire.615. A mechanically operating superconducting switch according to claim 1 , wherein complementary protrusions and recesses are provided on respective contact surfaces ().7. A mechanically operating superconducting switch according to claim 1 , wherein at least one of the blocks contains ...

HIGH TEMPERATURE SUPERCONDUCTING MAGNET

Systems and methods for superconducting magnets are disclosed, such systems and methods comprising a primary coil and short-circuited secondary coil. The secondary coil can be made from a stack of superconducting tapes having longitudinal cuts forming closed superconductor loops without splices. The primary coil is used to pump the current into the secondary coil where it circulates continuously generating a permanent magnetic field. 1. A system comprising:a first conductor configured in a strip with a longitudinal cut along a portion of the first conductor;at least one second conductor configured in a strip with a longitudinal cut along a portion of the at least one second conductor;wherein the first conductor and the at least one second conductor are arranged in a stack and a first end of the first conductor is shorted to a first end of the at least one second conductor and a second end of the first conductor is shorted to a second end of the at least one second conductor thereby forming a closed loop.2. The system of wherein the at least one second conductor comprises a plurality of conductors.3. The system of wherein the first conductor and the at least one second conductor comprise tape type conductors.4. The system of wherein the first conductor and the at least one second conductor comprise superconductors.5. The system of wherein the first conductor and the at least one second conductor comprise HTS tape type conductors.6. The system of wherein the longitudinal cut along the first conductor is configured to be a length of a half coil perimeter; and the longitudinal cut along the at least one second conductor is configured to a length of a half coil perimeter.7. The system of wherein the stack of the first conductor and the at least one second conductor is impregnated with epoxy.8. The system of further comprising:a ferromagnetic yoke wherein the closed loop is mounted in the ferromagnetic yoke.9. The system of further comprising:a primary conducting coil; ...

SUPERCONDUCTING MAGNET AND METHOD FOR ADJUSTING THE SAME

A superconducting magnet includes a pair of superconducting coils, two heat shields surrounding the pair of superconducting coils, respectively, two vacuum chambers accommodating the two heat shields, respectively, and facing each other with a predetermined space sandwiched therebetween, a magnetic shield covering at least a portion of the two vacuum chambers, and two position adjustment mechanisms supporting the two vacuum chambers, respectively, in a position-adjustable manner. The two position adjustment mechanisms change distribution of a static magnetic field formed in the predetermined space by the pair of superconducting coils, by adjusting relative positional relation between the two vacuum chambers. 1. A superconducting magnet , comprising:a pair of superconducting coils;two heat shields surrounding said pair of superconducting coils, respectively;two vacuum chambers accommodating said two heat shields, respectively, and facing each other with a predetermined space sandwiched therebetween;a magnetic shield covering at least a portion of said two vacuum chambers; andtwo position adjustment mechanisms supporting said two vacuum chambers, respectively, in a position-adjustable manner,said two position adjustment mechanisms changing distribution of a static magnetic field formed in said predetermined space by said pair of superconducting coils, by adjusting relative positional relation between said two vacuum chambers,said magnetic shield having position references for adjustment of positions of said two vacuum chambers by said two position adjustment mechanisms.2. (canceled)3. The superconducting magnet according to claim 1 , wherein each of said two position adjustment mechanisms includes a linear guide provided on said magnetic shield claim 1 , and a jack provided on the linear guide.4. The superconducting magnet according to claim 1 , wherein each of said two position adjustment mechanisms includes an internal thread provided to penetrate through said ...

A pressure limiting valve for a cryostat containing a cryogen and a superconducting magnet

An abstract for a quench valve of a cryostat, in particular for use in a magnetic resonance imaging system, is attachable to the quench valve so as to raise the cracking pressure of the quench valve without changing the operability of the quench valve. Such an accessory device is usable to enable the cryostat, containing a cryogen, to be safely transported by air transportation.

OVER-PRESSURE LIMITING ARRANGEMENT FOR A CRYOGEN VESSEL

An over-pressure limiting arrangement for a cryogen vessel includes an access neck providing access into the cryogen vessel, a tubular structure extending through the access neck, a turret outer assembly joined leak-tight to the cryogen vessel and defining an interior volume that is separated from the atmosphere by a protective valve or burst disc, enclosing an upper extremity of the access neck and the tubular structure. An egress path defines a route for cryogen gas to escape from the turret outer assembly, and a pressure-responsive quench valve seals the egress path and opens when a differential pressure between the interior of the turret outer assembly and the interior of the egress path exceeds a predetermined value. An auxiliary burst disc, or a valve, is attached to the tubular structure within the turret outer assembly, with an inner surface thereof exposed to the interior of the tubular structure and an outer surface thereof exposed to the interior of the turret outer assembly. 1. An over-pressure limiting arrangement for a cryogen vessel comprising:an access neck that provides access into a cryogen vessel at its lower extremity;a tubular structure extending through the access neck;a turret outer assembly joined to the cryogen vessel in a leak-tight manner and defining an interior volume which is separated from atmosphere by a protective valve or burst disc, the interior volume enclosing upper extremities of the access neck and the tubular structure;an egress path defining a route for cryogen gas to escape from the turret outer assembly; anda pressure limiting device sealing the egress path from the interior of the turret outer assembly, operable to open in response to a differential pressure between the interior of the turret outer assembly and the interior of the egress path exceeding a predetermined value; characterized in that the over-pressure limiting arrangement further comprises—an auxiliary burst disc attached to the tubular structure, such that an ...

SUPERCONDUCTING WIRE AND COIL UNIT

A superconducting wire according to the present disclosure includes: a base material; a superconductor layer formed on each of the respective surfaces of the base material; and a conductive protection layer formed on each of the surfaces of the respective superconductor layers. The thickness of each of the conductive protection layers is 5% or less of the skin depth when a high-frequency current flows through the superconducting wire. The material for forming the conductive protection layer may be, for example, silver. 1. A superconducting wire comprising:a base material;a superconductor layer formed on each of the respective surfaces of the base material; anda conductive protection layer formed on each of the surfaces of the respective superconductor layers,wherein the thickness of each of the conductive protection layers is 5% or less of the skin depth when a high-frequency current flows through the superconducting wire.2. The superconducting wire according to claim 1 , wherein the thickness of each of the conductive protection layers is 3% or less of the skin depth when a high-frequency current flows through the superconducting wire.3. The superconducting wire according to claim 1 , wherein the conductive protection layer is formed using silver.4. A superconducting wire comprising:a base material;a superconductor layer formed on each of the respective surfaces of the base material; anda dielectric protection layer formed on each of the surfaces of the respective superconductor layers,wherein the dielectric protection layer is formed using a material having a value of a dielectric tangent (tan δ) of 0.001 or smaller.5. The superconducting wire according to claim 4 , wherein the dielectric protection layer is formed using a material having a value of a dielectric tangent (tan δ) of 0.0001 or smaller and a thickness of 0.5 mm or smaller.6. The superconducting wire according to claim 4 , wherein the dielectric protection layer is formed using a material having a ...

Band-Shaped superconducting element with improved self-protection in case of quenching

A superconducting element () has a metallic substrate (), an insulating layer (), a superconductor layer () and a metallic protective layer (), wherein the insulating layer () is arranged between the substrate () and the superconductor layer (). In cross-section of the superconducting element (), the insulating layer () extends at both ends past the area (B) of the substrate () covered by the superconductor layer () to galvanically separate the superconductor layer () and the metallic protective layer () from the substrate (). The thickness D of the insulating layer () is selected in such a fashion that the superconducting element () has a transverse breakdown voltage between the metallic substrate () and both the superconductor layer () as well as the metallic protective layer () of at least 25 V. The superconducting element has a reduced risk of being damaged in case of a quench. 1. A superconducting element comprising:a metallic substrate;a superconductor layer;a metallic protective layer; andan insulating layer disposed between said substrate and said superconductor layer, wherein, in cross-section of the superconducting element, said insulating layer extends at both ends thereof past an area of said substrate covered by said superconductor layer to galvanically separate said superconductor layer and said metallic protective layer from said substrate, said insulating layer thereby having a thickness which is selected in such a fashion that the superconducting element has a transverse breakdown voltage between said metallic substrate and both said superconductor layer as well as said metallic protective layer of at least 25 V.2. The superconducting element of claim 1 , wherein said metallic protective layer contacts said insulating layer.3. The superconducting element of claim 1 , wherein claim 1 , in cross-section claim 1 , said metallic protective layer surrounds said superconductor layer like a hood.4. The superconducting element of claim 1 , wherein claim 1 , ...

MAGNETIC TOPOLOGICAL NANOWIRES

A magnetic topological nanowire structure comprises a superconductor and a quasi-1D magnetic nanowire. The quasi-1D magnetic nanowire is coupled to or embedded in the superconductor to produce a self-contained interaction resulting in a spatially separated pair of Majorana fermions. The pair of Majorana fermions corresponds to the topological superconductor and each of the pair of the Majorana fermions are localized near a respective endpoint of the nanowire. 1. A magnetic topological nanowire structure , comprising:a superconductor; anda quasi-1D magnetic nanowire that is coupled to or embedded in the superconductor to produce a self-contained interaction resulting in a spatially separated pair of Majorana fermions, wherein the pair of Majorana fermions correspond to the magnetic topological nanowire structure and wherein each of the pair of the Majorana fermions are located near a respective endpoint of the quasi-1D magnetic nanowire.2. The magnetic topological nanowire structure of claim 1 , wherein the resulting pair of Majorana fermions form a topological qubit.3. The magnetic topological nanowire structure of claim 1 , wherein the quasi-1D nanowire is ferromagnetic.4. The magnetic topological nanowire structure of claim 1 , wherein the quasi-1D magnetic nanowire has a non-collinear or spiral magnetic texture.5. The magnetic topological nanowire structure of claim 4 , wherein the quasi-1D magnetic nanowire is comprised of elements from the transition metal or lanthanide series or a combination thereof.6. The magnetic topological nanowire structure of claim 1 , wherein the quasi-1D magnetic nanowire is an atomic chain.7. The magnetic topological nanowire structure of claim 6 , wherein the atomic chain of the quasi-1D magnetic nanowire comprises a thickness of one or more atoms.8. The magnetic topological nanowire structure of claim 1 , wherein the superconductor is an s-wave superconductor with spin-orbit coupling.9. The magnetic topological nanowire structure ...

SUPERCONDUCTING MAGNET

A superconducting magnet includes: a superconducting coil; a coolant container; a radiation shield; a vacuum container; a refrigerator configured to cool the inner part of the coolant container and the radiation shield; a first exhaust pipe connected to the coolant container from the outside of the vacuum container and serving as a flow path of the coolant vaporized; a first pressure release valve connected to a distal end of the first exhaust pipe outside the vacuum container and configured to open when a pressure in the coolant container becomes a first set value or higher; a heater provided at the first exhaust pipe and configured to heat the first exhaust pipe; and a detector provided at the first exhaust pipe and configured to detect a change due to occurrence of freezing in the first exhaust pipe. 15-. (canceled)6. A superconducting magnet comprising:a superconducting coil;a coolant container containing the superconducting coil in a state where the superconducting coil is immersed in liquid coolant;a radiation shield surrounding the coolant container;a vacuum container containing the superconducting coil, the coolant container, and the radiation shield;a refrigerator configured to cool an inner part of the coolant container and the radiation shield;a first exhaust pipe connected to the coolant container from outside of the vacuum container and serving as a flow path of the coolant vaporized;a first pressure release valve connected to a distal end of the first exhaust pipe outside the vacuum container and configured to open when a pressure in the coolant container becomes a first set value or higher;a heater provided at the first exhaust pipe and configured to heat the first exhaust pipe; anda detector provided at the first exhaust pipe and configured to detect a change due to occurrence of freezing in the first exhaust pipe,the detector including a pair of terminals disposed inside the first exhaust pipe,the change being a change in potential difference ...

INCREASED NORMAL ZONE PROPAGATION VELOCITY IN SUPERCONDUCTING SEGMENTS

There is described herein a superconducting segment and method of making same comprising one or several layers with very high electrical resistivity, acting as a current flow diverter when the current transfers from the superconductor to the stabilizer. The purpose of this current flow diverter is: i) to increase the contact resistance between the superconductor and the stabilizer, by reducing the contact area, and ii) to force the current to flow along a specific path, so as to increase momentarily the current density in a specific portion of the stabilizer. The consequence of i) and ii) is that heat generated at the extremities of the normal zone is increased and spread over a longer length along the superconducting segment, which increases the NZPV and thus, the uniformity of the quench. 1. A superconducting segment comprising:a substrate;{'sub': 'c', 'a superconducting layer on the substrate, having a width and made of a material that undergoes a transition from a superconducting state to a normal state when its temperature (T) rises beyond a critical temperature (T),'}{'sub': c', 'c, 'a stabilizer having an electrical resistance greater than the superconducting layer when T is below Tand lower than the superconducting layer when T is equal to or above T, and having an inner surface at least partly in contact with the superconducting layer and an opposed outer surface; and'}{'sub': 'c', 'a current flow diverter having a greater electrical resistance than the stabilizer when T is below T, and located between the stabilizer and the superconducting layer or inside the stabilizer, the current flow diverter extending between the superconducting layer and the outer surface of the stabilizer along at least a portion of the width of the superconducting layer and having a first contact resistance along the portion of the width, and defining at least one current path from the superconducting layer to the outer surface of the stabilizer having a second contact resistance ...

HTS MAGNET QUENCH INITIATION SYSTEM

A device comprising a high temperature superconductor, HTS, circuit; wherein the HTS circuit comprises: a quenchable section comprising HTS material and connected in series to other elements of the HTS circuit, the HTS material comprising a stack of HTS takes comprising at least one HTS tape; the device further comprising: a quenching system configured to quench the HTS material in the quenchable section; a quench protection system configured to detect temperature rises in the HTS circuit and, in response to detection of a temperature rise, cause the quenching system to quench the superconducting material in the quenchable section in order to dump stored magnetic energy from the HTS circuit into the quenchable section; wherein the HTS circuit is configured such that, when in use, the magnetic field on the or each HTS tape is substantially parallel to a a-b plane of the HTS tape, and the quenching system is configured to quench the HTS material by producing an additional magnetic field along the length of the or each HTS tape within the quenchable section, such that the additional magnetic field has a component perpendicular to the a-b plane of the HTS tape. 1. A device comprising a high temperature superconductor , HTS , circuit;wherein the HTS circuit comprises:a quenchable section comprising HTS material and connected in series to other elements of the HTS circuit, the HTS material comprising a stack of HTS tapes comprising at least one HTS tape;the device further comprising:a quenching system configured to quench the HTS material in the quenchable section;a quench protection system configured to detect temperature rises in the HTS circuit and, in response to detection of a temperature rise, cause the quenching system to quench the superconducting material in the quenchable section in order to dump stored magnetic energy from the HTS circuit into the quenchable section;wherein the HTS circuit is configured such that, when in use, the magnetic field on the or each ...

Light-Weight, Efficient Superconducting Magnetic Energy Storage

Novel configurations to improve the performance of superconducting magnetic energy storage system are described. The use of poloidal grading of the conductor, enabled by the use of 2generation YBCO conductors, is described. Methods to improve system performance when limited by the critical field of the superconductor are described, using optimized thin winding pack and thick winding pack toroidal geometries, where a uniform or near uniform magnetic field can be generated in a torus. Configurations that minimize structural requirements, weight and costs are also described. Cryostat innovations useful with toroidal systems are provided. 1. A superconducting magnet made from epitaxially deposited superconductor tapes , wherein a superconductor tape width is adjusted so that , when used in a magnet having a coil , the margin , defined as a ratio between the operating current and the critical current , is relatively constant throughout the coil.2. The superconducting magnet of claim 1 , wherein the magnet is a toroidally wound magnet claim 1 , wherein the superconductor tape width is adjusted from an inner leg to an outer leg claim 1 , and is adjusted from an inner bore to a periphery.3. The superconducting magnet of claim 1 , wherein the magnet is a toroidally wound magnet claim 1 , wherein the superconductor tape width is adjusted from the inner bore of the magnet to the periphery.4. The superconducting magnet of claim 1 , wherein the magnet is a toroidally wound magnet claim 1 , wherein the superconductor tape width is adjusted from an inner leg to an outer leg.5. The superconducting magnet of claim 1 , wherein the superconductor is made from YBCO or ReBCO superconductor.6. The superconducting magnet of claim 1 , comprising one or more shells made from multiple shell sectors claim 1 , and a plurality of radial plates connected mechanically or thermally for load and thermal management.7. A superconducting toroidal magnet made from plates claim 1 , wherein ...

Cryostat inspection camera arrangement and method

A bung assembly for closing an opening in a turret of a cryostat has a camera housing and bung body that is mechanically dimensioned to fit the opening, and is provided with a sealing arrangement for forming a gas-tight seal between the bung body and the turret.

SUPERCONDUCTING WIRE AND SUPERCONDUCTING COIL

A superconducting wire according to one embodiment of the present disclosure includes: a substrate having a first surface and a second surface; a superconducting layer having a third surface and a fourth surface; and respective coating layers. The second surface is opposite to the first surface. The fourth surface is opposite to the third surface. The superconducting layer is disposed on the substrate such that the third surface faces the second surface. The respective coating layers are disposed on the first surface and the fourth surface. Adhesion strength between the substrate and the coating layer disposed on the first surface is lower than adhesion strength between the superconducting layer and the coating layer disposed on the fourth surface. 1. A superconducting wire comprising:a substrate having a first surface and a second surface opposite to the first surface;a superconducting layer having a third surface and a fourth surface opposite to the third surface, the superconducting layer being disposed on the substrate such that the third surface faces the second surface; andrespective coating layers disposed on the first surface and the fourth surface, whereinadhesion strength between the substrate and the coating layer disposed on the first surface is lower than adhesion strength between the superconducting layer and the coating layer disposed on the fourth surface.2. The superconducting wire according to claim 1 , wherein the coating layers have respective stabilization layers disposed on the first surface and the fourth surface.3. The superconducting wire according to claim 2 , wherein a thickness of the stabilization layer disposed on the first surface is smaller than a thickness of the stabilization layer disposed on the fourth surface.4. The superconducting wire according to claim 2 , wherein the stabilization layer disposed on the first surface is constituted of a single layer claim 2 , and the stabilization layer disposed on the fourth surface is ...

METHOD FOR JOINING SUPERCONDUCTING WIRES, AND SUPERCONDUCTING JOINT

The method comprises stripping matrix material from superconducting wires to expose superconducting filaments, placing the filaments between electrically conductive pieces, and applying magnetic welding to the electrically conductive pieces. The resulting superconducting joint comprises the filaments cold welded with molecular bonds between each other and between the filaments and the two electrically conductive pieces. 1. A method for electrically joining superconducting wires , comprising:stripping matrix material from superconducting wires to expose superconducting filaments of the superconducting wires;placing the exposed superconducting filaments between two electrically conductive pieces, a first of said electrically conductive pieces being an electrically conductive tube or cup that is open at at least one end, and a second of the electrically conductive pieces being an insert that fits into said at least one open end; andmagnetically welding the two electrically conductive pieces to form a superconducting joint that comprises the exposed superconducting filaments welded with molecular bonds between each other and between the exposed superconducting filaments and the two electrically conductive pieces, whereby the tube or cup is violently compressed into contact with the insert with said exposed superconducting filaments positioned between the insert and the tube or cup.2. A method as claimed in comprising plaiting the exposed superconducting filaments together before placing the superconducting filaments between the two electrically conductive pieces.3. A method as claimed in wherein said insert has a tapered end and comprising claim 1 , prior to said magnetic welding claim 1 , wrapping the exposed superconducting filaments around said insert and inserting said tapered end of said insert into one open end of said tube or cup.4. A method as claimed in wherein said insert has a tapered end and comprising claim 1 , prior to said magnetic welding claim 1 , ...

MAGNETIC RESONANCE IMAGING SYSTEM WITH EMERGENCY QUENCH

The invention relates to a magnetic resonance imaging (MRI) system with emergency quench. According to the invention, a magnetic resonance imaging system () comprising a superconductive magnet () with windings () for generating a magnetic field, an emergency button () and a circuitry logic () for controlling the magnet () coupled to the magnet () and to the emergency button (), wherein the magnet () is operable in a superconducting state and in a normal conductivity state, respectively, and the emergency button () and the circuitry logic () are configured in such a way that, when the magnet () is operated in the superconducting state, actuating the emergency button () by a user in a predefined first way initiates ramping down the magnetic field while dissipating energy stored in the windings () of the magnet () to an external dissipation device (), and actuating the emergency button () by a user in a predefined second way which is different from the first way initiates quenching the magnetic field by heating up at least part of the windings () of the magnet () leading to a dissipation of energy stored in the windings () of the magnet () as additional heat to the magnet (). In this way, an easy and reliable way to control a superconductive magnet () of an MRI system () is provided in an event in which the magnetic field has to be removed. 1. Magnetic resonance imaging system comprising a superconductive magnet with windings for generating a magnetic field , an emergency button and a circuitry logic for controlling the magnet coupled to the magnet and to the emergency button , whereinthe magnet is operable in a superconducting state and in a normal conductivity state, respectively, andthe emergency button and the circuitry logic are configured in such a way that, when the magnet is operated in the superconducting state, actuating the emergency button by a user in a predefined first way initiates ramping down the magnetic field while dissipating energy stored in the ...

SUPERCONDUCTOR COIL ARRANGEMENT

A coil arrangement formed from a stripe-shaped superconductor assembly is composed of metal substrate () and at least one superconductor layer () wherein the coil arrangement is such, that in adjacent turns current flow is in opposite direction in operation, and wherein the substrate side () is in a region without magnetic field by sandwiching the substrate side () between superconductor layers () of same current direction during operation. 1. Coil arrangement comprising:at least one stripe-shaped superconductor assembly with meta substrate; andsuperconductor layer formed onto at least one side of the metal substratewherein the at least one stripe-shaped superconductor assembly is formed into a coil arrangementwherein in adjacent turns current flow is in opposite direction in operation, andwherein in the stripe-shaped superconductor assembly the metal substrate is sandwiched between two superconductor layers of same current direction.2. Coil arrangement according to claim 1 , wherein the coil arrangement comprises two or more stripe-shaped superconductor assemblies which are wound side by side into the coil arrangement.3. Coil arrangement according to claim 1 , wherein the stripe-shaped superconductor assembly is composed of two superconductor stripes claim 1 , each superconductor stripe having a metal substrate and provided onto one side of the metal substrate a superconductor layer wherein the superconductor stripes are arranged in parallel with the substrate sides facing each other and the superconductor layer sides pointing outwards.4. Coil arrangement according to claim 3 , wherein the superconductor stripes of the stripe-shaped superconductor assembly are jointed at their substrate sides.5. Coil arrangement according to claim 1 , wherein the stripe-shaped superconductor assembly comprises a metal substrate and a superconductor layer onto both the top and bottom side of the substrate.6. Coil arrangement according to claim 1 , wherein the metal material of the ...

SUPERCONDUCTING COIL DEVICE WITH SWITCHABLE CONDUCTOR SECTION AND METHOD FOR SWITCHING

In a coil device with at least one electrical coil winding with superconducting conductor material, the coil winding is part of a self-contained circuit for formation of a continuous current. The closed circuit has a switchable conductor section which can be switched between a superconducting state and a normally conducting state by a magnetic device. 1. A coil device , comprising:a closed circuit carrying a continuous current, the closed circuit including at least one superconducting coil winding with superconducting conductor material and a switchable conductor section configured to be switched between a superconducting state and a normally conducting state; anda magnetic device configured to switch the switchable conductor section between the superconducting state and the normally conducting state.2. The coil device as claimed in claim 1 , wherein the magnetic device includes at least one permanent magnet.3. The coil device as claimed in claim 2 , further comprising an element of motion configured to move the at least one permanent magnet relative to the switchable conductor section.4. The coil device as claimed in claim 2 , wherein the at least one permanent magnet is connected to a magnetically soft yoke configured to guide a magnetic field to the switchable conductor section.5. The coil device as claimed in claim 2 , further comprising:a vacuum container surrounding the at least one superconducting coil winding and the magnetic device; andan element of motion configured to move at least part of the magnetic device by an external force acting on the vacuum container.6. The coil device as claimed in claim 1 , further comprising a vacuum container surrounding the at least one superconducting coil winding and at least part of the magnetic device.7. The coil device as claimed in claim 1 , wherein the closed circuit further includes a superconducting coated conductor.8. The coil device as claimed in claim 7 , wherein the magnetic device includes a directional ...

QUENCH DETECTION IN SUPERCONDUCTING MAGNETS

A high temperature superconductor, HTS, tape () for detecting a quench in a superconducting magnet. The HTS tape comprises an HTS layer () of HTS material supported by a substrate (). The HTS layer is divided into a plurality of strips (). The strips are connected () in series along an open path. 125-. (canceled)26. A high temperature superconductor , HTS , tape for detecting a quench in a superconducting magnet , the HTS tape comprising an HTS layer of HTS material supported by a substrate , the HTS layer being divided into a plurality of strips , the strips being connected in series along an open path.27. An HTS tape according to claim 26 , wherein the strips are arranged to carry current in opposite directions and to be parallel and adjacent to each other.28. An HTS tape according to claim 26 , wherein the strips are connected within the HTS layer by the HTS material.29. An HTS tape according claim 28 , wherein the plurality of strips are separated by a plurality of striations through the HTS layer claim 28 , each striation having a first end extending from an end of the HTS layer and a second end terminating within the HTS layer adjacent an opposite end of the HTS layer claim 28 , the first ends of successive striations extending to opposite ends of the HTS layer.30. An HTS tape according to claim 28 , wherein the plurality of strips are separated by non-superconducting barriers of the HTS material.31. An HTS tape according to claim 30 , wherein the non-superconducting barriers are non-superconducting as a result of thermal damage to the HTS material.32. An HTS tape according to claim 26 , wherein each end of the open path connecting the strips in series is located at a single end of the HTS layer.33. An HTS tape according to claim 26 , wherein each end of the open path connecting the strips in series is located at a single edge of the HTS layer.34. An HTS tape according to claim 26 , wherein the HTS material is coated with a stabiliser layer comprising ...

SUPERCONDUCTING MAGNET SYSTEM

A superconducting magnet system includes a coil support structure, superconducting coils, and electrically and thermally conductive windings. The superconducting coils and the conductive windings are supported by the coil support structure. Each conductive winding is electromagnetically coupled with a corresponding superconducting coil. Each conductive winding is electrically shorted. 1. A superconducting magnet system comprising:a thermal shield; anda former as a coil support structure concentrically arranged in the thermal shield;superconducting coils supported by the coil support structure;electrically and thermally conductive windings supported by the coil support structure;wherein each conductive winding is electromagnetically coupled with a corresponding superconducting coil, and each conductive winding is electrically shorted; andwherein the conductive windings are installed on one of an inner surface of the former and an outer surface of the former.2. The superconducting magnet system of claim 1 , wherein the thermal shield is donut-shaped and the former is cylinder-shaped.3. The superconducting magnet system of claim 1 , wherein the former is made of metal material.4. The superconducting magnet system of claim 3 , wherein the metal material is aluminum. This application is a continuation of the U.S. patent application Ser. No. 13/559,256, filed Jul. 26, 2012, which is hereby incorporated by reference in its entirety.Superconducting magnet systems having relatively large energies are currently used in many applications. For example, superconducting magnet systems, storing energies of up to 10 M Joules, are constructed for Magnetic Resonance Imaging (MRI) systems which are now being routinely used in large numbers in clinical environments for medical imaging. A part of such an MRI system is a superconducting magnet system for generating a uniform magnetic field.Superconducting magnets tend to be inherently unstable in that the temperature of a winding region ...

SUPERCONDUCTING MAGNET

A coil unit is formed of an oxide superconducting wire having a surface in a form of a strip and wound. A residual magnetic field restraint unit is disposed in the coil unit. The residual magnetic field restraint unit has a throughhole extending in an axial direction of the coil unit. The residual magnetic field restraint unit is formed of a magnetic substance. A residual magnetic field can thus be restrained. 1. A superconducting magnet comprising:a coil unit formed of an oxide superconducting wire having a surface in a form of a strip and wound; anda residual magnetic field restraint unit formed of a magnetic substance, disposed in said coil unit, and having a throughhole extending in an axial direction of said coil unit.2. The superconducting magnet according to claim 1 , wherein said magnetic substance has a maximum magnetic permeability equal to or larger than 100.3. The superconducting magnet according to claim 1 , wherein said residual magnetic field restraint unit has a length in said axial direction equal to or larger than a width of said surface in the form of said strip of said oxide superconducting wire.4. The superconducting magnet according to claim 1 , wherein said residual magnetic field restraint unit has a length in said axial direction equal to or larger than a half of a length of said coil unit in said axial direction.5. The superconducting magnet according to claim 1 , wherein said residual magnetic field restraint unit has a length in said axial direction equal to or larger than a length of said coil unit in said axial direction.6. The superconducting magnet according to claim 1 , wherein said residual magnetic field restraint unit has a length in said axial direction larger than a length of said coil unit in said axial direction.7. The superconducting magnet according to claim 1 , wherein said residual magnetic field restraint unit includes a pipe having a wall thickness equal to or larger than 1 mm.8. The superconducting magnet according to ...

DEFECT-IRRELEVANT HIGH TEMPERATURE SUPERCONDUCTOR (HTS) MAGNET

A superconducting coil, including at least one high-temperature superconducting (HTS) no-insulation (NI) conductor wound about a longitudinal axis to form a pancake coil, wherein the at least one HTS NI conductor comprises one or more defects. 1. A superconducting coil , comprising:at least one high-temperature superconducting (HTS) no-insulation (NI) conductor wound about a longitudinal axis to form a pancake coil, wherein the at least one HTS NI conductor comprises one or more defects.2. The superconducting coil of claim 1 , wherein the HTS NI conductor is a wire.3. The superconducting coil of claim 1 , wherein the HTS NI conductor is a tape.4. The superconducting coil of claim 1 , wherein the one or more defects of the HTS NI conductor are identified as locations within the HTS NI conductor in which a local critical current is less than about 80% of an average critical current of the HTS NI conductor.5. The superconducting coil of claim 1 , wherein a defect of the one or more defects is a discontinuity in the HTS NI conductor.6. The superconducting coil of the claim 1 , wherein the HTS NI conductor is a REBCO (RE-Ba—Cu—O claim 1 , RE: rare Earth) conductor.7. A superconducting coil claim 1 , comprising:at least one high-temperature superconducting (HTS) no-insulation (NI) conductor wound about a longitudinal axis to form a pancake coil, wherein the at least one HTS NI conductor comprises one or more defects and wherein the one or more defects are identified as locations within the HTS NI conductor in which a local critical current is less than about 80% of an average critical current of the HTS NI conductor.8. The superconducting coil of claim 7 , wherein the HTS NI conductor is a wire.9. The superconducting coil of claim 7 , wherein the HTS NI conductor is a tape.10. The superconducting coil of claim 7 , wherein a defect of the one or more defects is a discontinuity in the HTS NI conductor.11. The superconducting coil of the claim 7 , wherein the HTS NI ...

SUPERCONDUCTING MAGNET

A superconducting magnet according to one embodiment includes: a coil including a superconducting layer having a first portion and a second portion, and a joining portion; and a cryostat in which the coil is stored. The first portion and the second portion are located in a termination portion. The superconducting layer forms a closed loop by superconducting joining of the first portion and the second portion at the joining portion. The superconducting layer is made of a high-temperature superconductor. A current flows through the joining portion in a superconducting state when a magnetic field equal to or greater than 1.0 tesla and equal to or less than 5.0 tesla is applied to the joining portion at 77 kelvin. The cryostat is configured such that a temperature inside the cryostat is equal to or greater than 2.0 kelvin and equal to or less than 77 kelvin. 1. A superconducting magnet comprising: a superconducting layer having a first portion and a second portion, and', 'a joining portion; and, 'a coil including'}a cryostat in which the coil is stored, whereinthe first portion and the second portion are located in a termination portion of the coil,the superconducting layer forms a closed loop by superconducting-joining of the first portion and the second portion at the joining portion,the superconducting layer is made of a high-temperature superconductor,a current flows through the joining portion in a superconducting state when a magnetic field equal to or greater than 1.0 tesla and equal to or less than 5.0 tesla is applied to the joining portion at 77 kelvin, and the cryostat is configured such that a temperature inside the cryostat is equal to or greater than 2.0 kelvin and equal to or less than 77 kelvin.2. The superconducting magnet according to claim 1 , wherein the joining portion is disposed at a position where a strength of a magnetic field generated by a current flowing through the coil is equal to or greater than 1.0 tesla and equal to or less than 5.0 ...

Magnetic Sensor with Combined High Pass Flux Concentrator and Flux Biasing Circuit

A superconducting quantum interference device (SQUID) for mobile applications comprising: a superconducting flux transformer having a pickup coil and an input coil, wherein the input coil is inductively coupled to a Josephson junction; a resistive element connected in series between the pickup coil and the input coil so as to function as a high pass filter such that direct current (DC) bias current is prevented from flowing through the input coil; and a flux bias circuit electrically connected in parallel to the superconducting flux transformer between the pickup coil and the input coil so as to reduce motion-induced noise. 1. A magnetic sensor for mobile applications comprising:a superconducting quantum interference device (SQUID);a superconducting flux transformer having a pickup coil and an input coil, wherein the input coil is inductively coupled to the SQUID;a resistive element connected in series between the pickup coil and the input coil so as to function as a high pass filter such that direct current (DC) bias current below a threshold is impeded from flowing through the input coil; anda flux bias circuit electrically connected in parallel to the superconducting flux transformer between the pickup coil and the input coil so as to provide a DC flux bias to the SQUID.2. The magnetic sensor of claim 1 , wherein the superconducting flux transformer is an 8 millimeter multilayer flux transformer.3. The magnetic sensor of claim 1 , wherein the superconducting flux transformer is a 16 millimeter multilayer flux transformer.4. The magnetic sensor of claim 1 , wherein the SQUID is a flip-chip DC SQUID magnetometer.5. The magnetic sensor of claim 3 , wherein the resistive element is a resistor.6. The magnetic sensor of claim 3 , wherein the resistive element is a capacitor.7. The magnetic sensor of claim 3 , wherein the magnetic sensor is mounted to a mobile platform.8. The magnetic sensor of claim 1 , wherein the SQUID is an array of SQUIDs.9. The magnetic sensor of ...

MRI APPARATUS, OPERATION METHOD THEREOF, AND QUENCHING PREVENTION DEVICE

In order to prevent quenching caused accidentally in a superconducting magnet, an MRI apparatus vibrates the superconducting magnet in order to prevent quenching of the superconducting magnet in a time period for which a predetermined imaging sequence is not executed (step ). As a specific method, a gradient magnetic field may be generated by a gradient magnetic field coil for an imaging sequence of the MRI apparatus, or a gradient magnetic field may be generated using a gradient magnetic field coil for vibration provided apart from the gradient magnetic field coil for an imaging sequence. In addition, in a period for which the predetermined imaging sequence is not executed, a phantom may be imaged to prevent the quenching of the superconducting magnet. 1. A magnetic resonance imaging apparatus , comprising:a superconducting magnet;a gradient magnetic field coil that applies a gradient magnetic field to imaging space;a high-frequency coil that applies a high-frequency magnetic field to the imaging space;a control unit that controls operations of the gradient magnetic field coil and the high-frequency coil to execute a predetermined imaging sequence; anda quenching prevention sequence execution unit that executes a quenching prevention sequence to vibrate the superconducting magnet in a time period for which the control unit does not execute the imaging sequence.2. The magnetic resonance imaging apparatus according to claim 1 ,wherein the quenching prevention sequence is a sequence of applying a gradient magnetic field to the superconducting magnet by driving the gradient magnetic field coil.3. The magnetic resonance imaging apparatus according to claim 1 ,wherein the quenching prevention sequence execution unit includes a coil for vibration, which applies a gradient magnetic field for vibrating the superconducting magnet to the superconducting magnet, apart from the gradient magnetic field coil, andthe quenching prevention sequence vibrates the coil for vibration.4. ...

SUPERCONDUCTING MAGNET

A superconducting magnet may include magnet coils including at least one group of outer coils and at least one group of inner coils, a container including an accommodating space, at least one first chamber that is disposed within the accommodating space and houses the at least one group of the inner coils, and at least one second chamber that is disposed within the accommodating space and houses the at least one group of the outer coils. The at least one first chamber and the at least one second chamber may be configured to be filled with a cooling medium and are in fluid communication with each other. The cooling medium may be configured to cool the magnet coils to a superconducting state. 1. A superconducting magnet , comprising:magnet coils including at least one group of outer coils and at least one group of inner coils;a container including an accommodating space;at least one first chamber that is disposed within the accommodating space and houses the at least one group of the inner coils; andat least one second chamber that is disposed within the accommodating space and houses the at least one group of the outer coils,wherein the at least one first chamber and the at least one second chamber are configured to be filled with a cooling medium and are in fluid communication with each other, the cooling medium being configured to cool the magnet coils to a superconducting state.2. The superconducting magnet of claim 1 , further comprising:a third chamber disposed within the accommodating space, the at least one first chamber and the at least one second chamber being in fluid communication with each other through the third chamber.3. The superconducting magnet of claim 2 , further comprising:an intermediate support structure disposed within the accommodating space;a first sealing structure disposed within the accommodating space, the first sealing structure being located closer to a central axis of the superconducting magnet than the intermediate support structure; ...

QUENCH PROTECTION IN SUPERCONDUCTING MAGNETS

A toroidal field coil comprising a central column, a plurality of return limbs, a quench protection system, and a cooling system. The central column comprises IITS material. Each return limb comprises a quenchable section, two IITS sections, and a quenching system. The quenchable section comprises superconducting material, and is configured to contribute towards a magnetic field of the toroidal field coil. The IITS sections comprise IITS material. The IITS sections electrically connect the quenchable section to the central column and are in series with the central column and the quenchable section. The quenching system is associated with the quenchable section and configured to quench the quenchable section. The quench protection system is configured to detect quenches in the toroidal field coil and, in response to detection of a quench, cause the quenching system to quench the superconducting material in one or more of the quenchable sections in order to dump energy from the toroidal field coil into the one or more quenchable sections. The cooling system is configured to cool each quenchable section to a temperature at which the superconducting material is superconducting. Each quenchable section has a heat capacity sufficient to cause a temperature of the quenchable section to remain below a first predetermined temperature when energy is dumped from the toroidal field coil into the quenchable section, and a resistivity sufficient to cause decay of the magnet's current quickly enough that the temperature of the quenched part of the HTS section remains below a second predetermined temperature. 2. A toroidal field coil according to claim 1 , wherein said first predetermined temperature is about 700 K or more preferably about 300 K.3. A toroidal field coil according to or claim 1 , wherein said second predetermined temperature is about 300K claim 1 , more preferably about 100K claim 1 , more preferably about 50K.4. A toroidal field coil according to claim 1 , wherein ...

MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGING MANAGEMENT METHOD

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period. The processing circuitry is configured to determine an imaging condition based on the allowable amount in the each of the plurality of imagings. 1. A magnetic resonance imaging apparatus comprising processing circuitry configured to:calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period; anddetermine an imaging condition based on the allowable amount in the each of the plurality of imagings.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is further configured to:accept a desired imaging condition desired by an operator;estimate a feature amount relating to heat input to the superconducting magnet in a case where an imaging is performed under the desired imaging condition; anddetermine the desired imaging condition as the imaging condition in a case where the feature amount is equal to or smaller than the allowable amount.3. The magnetic resonance imaging apparatus according to claim 2 , wherein the processing circuitry is further configured to limit an input value of an imaging parameter relating to the desired imaging condition by the operator claim 2 , based on the allowable amount.4. The magnetic resonance imaging apparatus according to claim 2 , wherein the processing circuitry is further configured to present the allowable amount to the operator.5. The magnetic resonance imaging apparatus according to claim 4 , wherein the processing circuitry is further configured to present the feature amount and a fill rate of the feature amount with respect to the allowable amount.6. The ...

MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD OF CONTROLLING SUPERCONDUCTING MAGNET

According to one embodiment, a MRI apparatus determines a first time during which a subsidiary power supply is capable of supplying power to a cooling device based on a capacity of the subsidiary power supply when power outage of a main power supply occurs, and determines a second time needed to demagnetize a superconducting magnet based on an excitation current of the superconducting magnet and a temperature of the superconducting magnet. The MRI apparatus determines starts ramp-down of the superconducting magnet after a third time based on the first time and the second time has elapsed from initiation of power outage of the main power supply. 1. A magnetic resonance imaging apparatus comprising:a superconducting magnet configured to generate a static magnetic field;a cooling device configured to cool the superconducting magnet;a main power supply configured to supply power to the cooling device;a subsidiary power supply configured to supply power to the cooling device during power outage of the main power supply;processing circuitry configured to determine a first time during which the subsidiary power supply is capable of supplying power to the cooling device based on a capacity of the subsidiary power supply when power outage of the main power supply occurs, obtain a temperature of the superconducting magnet, and determine a second time needed to demagnetize the superconducting magnet based on an excitation current of the superconducting magnet and the temperature; anda ramp-down unit configured to start ramp-down of the superconducting magnet after a third time based on the first time and the second time has elapsed from initiation of power outage of the main power supply.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to determine the first time based on a capacity of the subsidiary power supply that allows for output or a remaining capacity of the subsidiary power supply.3. The magnetic ...

Improved Vortex Flux Generator

Various implementations of the invention correspond to an improved vortex flux generator. In some implementations of the invention, the improved vortex flux generator includes a magnetic circuit configured to produce a magnetic field; a quench controller configured to provide a variable current; a vortex material configured to form and subsequently dissipate a vortex in response to the variable current, wherein upon formation of the vortex, a magnetic field density surrounding the vortex is urged to decrease, and wherein upon subsequent dissipation of the vortex, the urging to decrease ceases and the magnetic field density increases prior to a reformation of the vortex, and wherein the decrease of the magnetic field density and the increase of the magnetic field density correspond to a modulation of the magnetic field; an inductor disposed in a vicinity of the vortex such that the modulation of the magnetic field induces an electrical current in the inductor; and a dissipation superconductor electrically disposed in parallel with the vortex material and configured to carry, without quenching, an entirety of the variable current during dissipation of the vortex in the vortex material. 1. A vortex flux generator comprising:a magnetic circuit configured to produce a magnetic field;a quench controller configured to provide a variable current; wherein upon formation of the vortex, a magnetic field density surrounding the vortex is urged to decrease, and', 'wherein upon subsequent dissipation of the vortex, the urging to decrease ceases and the magnetic field density increases prior to a reformation of the vortex, and', 'wherein the decrease of the magnetic field density and the increase of the magnetic field density correspond to a modulation of the magnetic field;, 'a vortex material configured to form and subsequently dissipate a vortex in response to the variable current,'}an inductor disposed in a vicinity of the vortex such that the modulation of the magnetic field ...

Partial insulation with diagnostic pickup coils

A partially insulating layer for use in an HTS magnet coil. The partially insulating layer comprises an insulating body 401 having within it a set of linking tracks and a set of pickup tracks. Each linking track is electrically conductive and is electrically connected to first and second surfaces of the partially insulating layer, in order to provide an electrical path between said first and second surfaces. Each pickup track is electrically conductive and is inductively coupled to a respective linking track, and electrically isolated from the first and second surfaces. Each of the pickup tracks is configured for connection to a current measuring device in order to measure a current induced in the pickup track by a change in current flowing in the respective linking track.

Superconducting coil system and methods of assembling the same

A superconducting magnet apparatus is provided. The superconducting magnet apparatus includes a power source configured to generate a current; a first switch coupled in parallel to the power source; a second switch coupled in series to the power source; a coil coupled in parallel to the first switch and the second switch; and a passive quench protection device coupled to the coil and configured to by-pass the current around the coil and to decouple the coil from the power source when the coil experiences a quench.

Apparatus for and methods of acoustic thermometry

This disclosure provides systems, methods, and apparatus related to thermometry. In one aspect, a method includes applying a first mechanical pulse to an object. The first vibrational response of the object to the first mechanical pulse is recorded. A second mechanical pulse is applied to the object. A second vibrational response of the object to the second mechanical pulse. The second vibrational response is compared to the first vibrational response to determine a change in a temperature in the object.

Superconducting magnet apparatus

A superconducting magnet apparatus is provided, which comprises a superconducting coil, an induction coil to be in inductive coupling with the superconducting coil, a first refrigerant vessel charged with a first refrigerant in which the superconducting coil is installed; and a second refrigerant vessel charged with a second refrigerant having a melting temperature higher than or a boiling temperature higher than a boiling temperature of the first refrigerant, the second refrigerant vessel in which the induction coil is installed, wherein the second refrigerant vessel is thermally isolated from the first refrigerant vessel.

HIGH TEMPERATURE SUPCONDUCTOR CABLE

A cable for carrying electrical current in a coil of a magnet. The magnet comprises an HTS transport tape and a shunt assembly comprising two or more HTS shunt tapes arranged side-by-side across a face of the transport tape. Each of the transport and shunt tapes comprises a substrate layer and an HTS layer of high temperature superconductor (HTS) material, the layers of the shunt tapes extending parallel to the layers of the transport tape. 1. A cable for carrying electrical current in a coil of a magnet , comprising:an HTS transport tape; anda shunt assembly comprising two or more HTS shunt tapes arranged side-by-side across a face of the transport tape;wherein each of the transport and shunt tapes comprises a substrate layer and an HTS layer of high temperature superconductor, HTS, material, the layers of the shunt tapes extending parallel to the layers of the transport tape.2. A cable according to claim 1 , wherein the HTS layer of one or more of the shunt tapes is interrupted by a plurality of discontinuities comprising dropouts and/or full or partial breaks in the HTS layer.3. A cable according to claim 2 , wherein the discontinuities are staggered between adjacent shunt tapes.4. A cable according to claim 2 , wherein the discontinuities within each of the one or more shunt tapes have a regular or semi-regular spacing.5. A cable according to claim 4 , wherein the spacing of the discontinuities differs between the shunt tapes.6. A cable according to claim 1 , wherein the shunt tapes comprise HTS material which is different from the HTS material in the transport tape.7. A cable according to claim 1 , wherein two or more shunt tapes comprise different HTS material from each other.8. A cable according to claim 1 , wherein the HTS and substrate layers of one or more of the shunt tapes has a different orientation compared to the HTS and substrate layers of the transport tape.9. A cable according to claim 8 , wherein the orientation of the HTS and substrate layers of ...

SUPERCONDUCTING MAGNET AND METHOD OF MANUFACTURING SUPERCONDUCTING MAGNET

A superconducting magnet includes a wound superconducting wire material. The superconducting wire material includes a configuration part in which, based on a difference in magnitude of a magnetic flux density which varies depending on at which the superconducting wire material is wound, a sectional area of a part having a relatively low magnetic flux density is smaller than a sectional area of a part having a relatively high magnetic flux density. 16-. (canceled)7. A superconducting magnet , comprising a wound high-temperature superconducting wire material ,wherein the high-temperature superconducting wire material comprises a configuration part in which, based on a difference in a magnitude of a radial direction component of a magnetic flux density in a radial direction of the superconducting magnet, which varies depending on a position at which the high-temperature superconducting wire material is wound, a sectional area of a part having the relatively small in the radial direction component of the magnetic flux density in the superconducting magnet is formed to be smaller than a sectional area of a part having the relatively large in the radial direction component of the magnetic flux density in the superconducting magnet.8. The superconducting magnet according to claim 7 ,wherein the high-temperature superconducting wire material comprises two or more wire material portions including a first wire material portion and a second wire material portion, the first wire material portion being wound at the part having the relatively small in the radial direction component of the magnetic flux density, the second wire material portion being wound at the part having the relatively large in the radial direction component of the magnetic flux density, andwherein the first wire material portion has a first sectional area taken along a plane perpendicular to a longitudinal direction of the high-temperature superconducting wire material, the second wire material portion has a ...

MAGNET ASSEMBLY WITH CRYOSTAT AND MAGNET COIL SYSTEM, WITH COLD RESERVOIRS ON THE CURRENT LEADS

A magnet assembly () with a cryostat () has a superconducting magnet coil system (), an active cooling device () for the coil system, and current leads () for charging the coil system. The current leads have at least one normal-conducting region (), wherein multiple cold reservoirs () are thermally coupled to the current leads along the normal-conducting region thereof, in order to absorb heat the normal-conducting region during charging of the magnet coil system. The current leads have a variable cross-sectional area B in the normal-conducting region along the extension direction thereof, wherein at least over a predominant fraction of their overall length in the normal-conducting region, the cross-sectional area B decreases from a cold end () toward a warm end (). This provides a magnet assembly requiring reduced cooling power during charging, with less heat introduced into the magnet coil system in normal operation. 1. A magnet assembly comprising:a cryostat with a superconducting magnet coil system,an active cooling device for the magnet coil system, and the current leads comprise at least one normal-conducting region,', 'multiple cold reservoirs are thermally coupled to the current leads along the normal-conducting region of the current leads, in order to absorb the heat arising in the normal-conducting region during the charging of the magnet coil system,', 'the current leads have a variable cross-sectional area B in the normal-conducting region along an extension direction of the current leads, and', 'at least over a predominant fraction of an overall length of the current leads in the normal-conducting region, the cross-sectional area B decreases from a cold end toward a warm end in the normal-conducting region., 'current leads configured to charge the magnet coil system in the cryostat, wherein2. The magnet assembly as claimed in claim 1 , wherein the current leads in the normal-conducting region each have N successive subsections claim 1 , with N≥2 claim 1 ...

Superconducting Coil Device With Coil Winding And Production Method

A superconducting coil device includes a superconducting flat conductor having one or more torsional turns. The flat conductor is wound around a winding support to define multiple turns of the conductor around the support. In at least one of the turns, the flat conductor is twisted through approximately 180 degrees about a longitudinal axis of the flat conductor, to thereby switch a contact side of the flat conductor from radially inwardly facing to radially outwardly facing, or vice versa. The contact side of the flat conductor at an inner turn faces a center of the winding and, and at an outer turn faces away from the center of the winding. The inwardly-facing contact side of the strip at an inner turn may be coupled to an inner contact element, and the outwardly-facing contact side at an outer turn may be conductively coupled to an outer contact element. 1. A superconducting coil device comprising:at least one coil winding comprising a superconducting strip conductor wound around a winding support multiple times to define a plurality of turns around the winding support, the superconducting strip conductor having a contact side with a contact layer defining a first conductor surface,wherein, in a particular turn around the winding support, the strip conductor is twisted in a torsion region of the particular turn by approximately 180 degrees about a longitudinal axis of the strip conductor, to thereby define a twisted turn of the winding, andwherein, in an inner turn of the winding, the contact side of the strip conductor faces a center of the winding, and in an outer turn of the winding located radially outward from the inner turn, the contact side of the strip faces away from the center of the winding.2. The superconducting coil device of claim 1 , comprising:an inner conductive contact element arranged adjacent an inner side of the coil winding and conductively coupled to the contact side of the strip conductor at the inner turn of the winding, wherein such ...

APPARATUS AND METHOD FOR MAGNETIC FIELD COMPRESSION

An apparatus for magnetic field compression includes a plurality of tubes of different dimensions. Each smaller tube extends within a larger tube and each tube includes an electrically conductive material for generating a magnetic field in response to electric current flowing in the conductive material. A longitudinal slot is formed in each tube. The longitudinal slot in each tube is aligned to form an aperture in which the magnetic field is compressed or has a highest magnetic flux in the aperture in response to the electric current flowing in the conductive material of each tube. 1. An apparatus for magnetic field compression , comprising:a plurality of tubes of different dimensions, each smaller tube extending within a larger tube and each tube comprising an electrically conductive material for generating a magnetic field in response to electric current flowing in the conductive material; anda longitudinal slot formed in each tube, the longitudinal slot in each tube being aligned to form an aperture in which the magnetic field is compressed or has a highest magnetic flux in the aperture in response to the electric current flowing in the conductive material of each tube.2. The apparatus of claim 1 , wherein each of the plurality of tubes comprises:a substrate comprising an inner surface and an outer surface;an inside layer of electrically conductive material or semiconductor material disposed on the inner surface of each substrate of those tubes that enclose another tube of the plurality of tubes; andan outside layer of electrically conductive material or semiconductor material disposed on the outer surface of each substrate of those tubes that are enclosed by another tube of the plurality of tubes.3. The apparatus of claim 2 , wherein the substrate comprises one of an electrical insulator material claim 2 , an electrical semiconductor material or an electrical conductive material.4. The apparatus of claim 2 , wherein the substrate comprises a material selected ...

APPARATUS AND METHOD OF GENERATING MOMENTUM USING SUPERCONDUCTING COILS

The present invention relates to an apparatus of generating momentum which drives an object. The present invention provides a momentum generating apparatus in which a pair of high temperature superconducting coils which are wound in different directions and have different superconducting properties are arranged in parallel and the same current flows in the pair of coils to be in a stable state where magnetic fields generated in the coils are cancelled and an asymmetric current is suddenly applied to the pair of coils through a switching operation to generate a magnetic field and an eddy current is induced in a plate due to the generated magnetic field and the plate is floated using a repulsive force between the magnetic field generated in the plate due to the eddy current and the magnetic field generated in the pair of coils, to instantaneously generate force using a small amount of superconducting coils. 1. A momentum generating apparatus using a superconducting coil , the apparatus comprising:a superconducting unit which includes a pair of a first superconducting coil unit and a second superconducting coil unit which are wound in different directions, have different superconductive properties, and are arranged in parallel;a power supply which supplies an AC power to the superconducting unit; anda switching unit which is connected to the superconducting unit and closes or opens a circuit in accordance with the manipulation,wherein when the switching unit is turned on to connect circuits at both sides of the switching unit, the superconducting unit instantaneously generates a predetermined amount or more of a magnetic field within a predetermined time.2. The apparatus of claim 1 , wherein the first superconducting coil unit and the second superconducting coil unit are high temperature superconductors which are objects whose critical temperature for having a superconductive property is set to a predetermined temperature or higher.3. The apparatus of claim 1 , wherein ...

CRYOGENIC COIL ASSEMBLY AND METHOD OF MANUFACTURING SAME

A cryogenic coil assembly including a coil substrate with a flat surface, and a number of radial channels cut into a region of the flat surface. The cryogenic coil assembly also includes a spiral coil covering the radial channels, and a chemical bonding agent for bonding the spiral coil to the coil substrate. The chemical bonding agent is present within the radial channels. 1. A cryogenic coil assembly comprising:a) a substrate having a flat surface;b) a plurality of radial channels defined in a region of the flat surface;c) a spiral coil covering the plurality of radial channels; andd) a chemical bonding agent for bonding the spiral coil to the substrate, wherein the chemical bonding agent is present within the plurality of radial channels.2. The cryogenic coil assembly of claim 1 , wherein the spiral coil comprises a wire claim 1 , wherein the chemical agent surrounds at least a portion of the wire of the spiral coil.3. The cryogenic coil assembly of claim 2 , wherein a cross-sectional shape of at least one of the radial channels comprises a mouth and a portion below the mouth claim 2 , wherein the mouth is narrower than the portion below the mouth.4. The cryogenic coil assembly of wherein the at least one radial channel comprises at least one undercut portion claim 3 , wherein the chemical bonding agent is present within the at least one undercut portion of the radial channel.5. The cryogenic coil assembly of claim 2 , wherein the region is a substantially circular region claim 2 , wherein the spiral coil is located within the region.6. The cryogenic coil assembly of claim 5 , further comprising a circumferential channel formed around a circumferential edge of the region.7. The cryogenic coil assembly of claim 5 , wherein at least one of the radial channels extends outwardly beyond an outer edge of the coil and inwardly beyond the inner edge of the coil.8. The cryogenic coil assembly of claim 7 , comprising a plurality of supplemental radial channels claim 7 , ...

SUPERCONDUCTING COIL CONFIGURATION

An example particle therapy system includes: a synchrocyclotron, and a gantry on which the synchrocyclotron is mounted to rotate around a patient position to position the synchrocyclotron relative to a treatment area of the patient. The synchrocyclotron includes a magnet having a coil to receive electrical current and to generate a magnetic field in response to the electrical current. The magnetic field causes the particles to move orbitally within a cavity at an energy that corresponds to the electrical current, and the coil includes multiple integrated conductors that are wound together. An integrated conductor includes: a core including conductive or superconducting material; and at least six strands wound around the core, with each of the at least six strands including a superconducting material. The synchrocyclotron includes an extraction channel to receive the particles from the cavity and to output the particles received from the cavity. 1. A superconducting coil comprising: a core; and', 'at least six strands cabled around the core, each of the at least six strands comprising a superconducting material., 'integrated conductors, an integrated conductor comprising2. The superconducting coil of claim 1 , wherein the at least six strands is six strands.3. The superconducting coil of claim 1 , wherein the superconducting material comprise niobium-tin (NbSn).4. The superconducting coil of claim 1 , wherein the core comprises a center strand comprised of superconducting material.5. The superconducting coil of claim 1 , of claim 1 , wherein the center strand comprises niobium-tin (NbSn).6. The superconducting coil of claim 1 , wherein the core comprises a non-superconducting center strand.7. The superconducting coil of claim 6 , wherein the center strand comprises copper.8. The superconducting coil of claim 1 , wherein the core comprises a strand having a different diameter than the at least six strands.9. The superconducting coil of claim 1 , wherein the core ...

FREQUENCY LOSS INDUCED QUENCH PROTECTION SYSTEM FOR HIGH TEMPERATURE SUPERCONDUCTORS AND ASSOCIATED METHOD OF USE

A protection system capable of safely quenching a high temperature superconductor (HTS) magnet coil. The protection circuit provides for a frequency loss induced quench design that advances the protection technology for HTS magnet coils and provides a protection system that is capable of quickly distributing the heat energy uniformly in all the coil sections when a localized hot-spot is created. 1. A method for controlling a quench in a high temperature superconductor (HTS) magnet coil , the method comprising:coupling a current imbalance source to at least one coil subsection of an HTS magnet coil, wherein the HTS magnet coil comprises a plurality of coil subsections; andoperating the current imbalance source to induce a current imbalance in the at least one coil subsection of the HTS magnet coil to establish a high frequency change in a magnetic field of the HTS magnet coil resulting in inductive heating of the HTS magnet coil to control a quench in the HTS magnet coil.2. The method of claim 1 , further comprising detecting a quench condition in the HTS magnet coil prior to operating the current imbalance source.3. The method of claim 1 , wherein the current imbalance source is selected from a current imbalance source external to the HTS magnet coil and a current imbalance source internal to the HTS magnet coil.4. The method of claim 1 , wherein a conductor of the HTS magnet coil is selected from an insulated conductor and an uninsulated conductor.5. The method of claim 1 , wherein the HTS magnet coil comprises an insulated conductor and wherein the current imbalance source comprises:an alternating current (AC) voltage source; anda capacitive element coupled in series with the AC voltage source, wherein the AC voltage source and the capacitive element are coupled across the at least one coil subsection of the HTS magnet coil.6. The method of claim 1 , wherein the HTS magnet coil comprises an insulated conductor and wherein the current imbalance source comprises:a ...

SUPERCONDUCTING COIL BODY AND SUPERCONDUCTING DEVICE

A superconducting coil body and a superconducting device are provided so as to achieve reduction of loss. A superconducting coil body includes: an inner circumferential coil body serving as a coil main body portion in which a superconducting wire is wound; and a first magnetic body serving as a magnetic circuit member. The magnetic circuit member is formed of a magnetic body, and is disposed to face the upper surface of the inner circumferential coil body, the upper surface being positioned at an end surface side thereof crossing a main surface of the superconducting wire in the inner circumferential coil body. The first magnetic body is used to form a magnetic circuit for permitting magnetic flux, which is generated by a current flowing in the coil main body portion, to travel around the current. 1. A superconducting coil body comprising:a coil main body portion in which a superconducting wire is wound; anda magnetic circuit member formed of a magnetic body and disposed to face a surface of said coil main body portion, said surface being positioned at an end surface side thereof crossing a main surface of said superconducting wire, said magnetic circuit member being used to form a magnetic circuit for permitting magnetic flux, which is generated by a current flowing in said coil main body portion, to travel around said current.2. The superconducting coil body according to claim 1 , whereinsaid magnetic circuit member includes a facing surface that faces said surface of said coil main body portion, andin said magnetic circuit member, said facing surface has an end portion projecting outwardly of said surface of said coil main body portion.3. The superconducting coil body according to claim 2 , whereinsaid magnetic circuit member includes a side surface continuous to said facing surface and extending in a direction crossing said facing surface, andsaid side surface has an inclination portion that is positioned at an end portion thereof close to said coil main body ...

Method for adjusting magnetic resonance imaging apparatus and superconductive magnet excitation dock

An adjustment method of a magnetic resonance imaging apparatus includes: a cooling and excitation step in which work of transporting a superconducting magnet to a facility different from a facility where the superconducting magnet is to be installed, cooling a superconducting coil of the superconducting magnet with a refrigerant, and supplying a current from an external power supply for excitation is repeated until a predetermined rated current flows; a demagnetization and transportation step of demagnetizing the superconducting coil and transporting the superconducting magnet to the facility where the superconducting magnet is to be installed in a state where the superconducting coil is cooled by the refrigerant; and an installation step of installing the superconducting magnet in the facility where the superconducting magnet is to be installed and supplying a predetermined rated current from an external power supply to the superconducting coil in order to excite the superconducting coil.

SUPERCONDUCTING WIRE

A superconducting wire includes a multilayer stack and a covering layer (stabilizing layer or protective layer). The multilayer stack includes a substrate having a main surface and a superconducting material layer formed on the main surface. The covering layer (stabilizing layer or protective layer) is disposed on at least the superconducting material layer. A front surface portion of the covering layer (stabilizing layer or protective layer) located on the superconducting material layer (front surface portion of the stabilizing layer or upper surface of the protective layer) has a concave shape. 1. A superconducting wire comprising:a multilayer stack including a substrate having a main surface, and a superconducting material layer formed on the main surface; anda covering layer disposed on at least the superconducting material layer,the covering layer located on the superconducting material layer having a front surface portion in a concave shape.2. The superconducting wire according to claim 1 , whereinin a cross section in a width direction of the substrate, a distance in a thickness direction of the substrate between an apex and a bottom of a region in the concave shape of the front surface portion is not less than 1 μm and not more than 100 μm.3. The superconducting wire according to claim 1 , whereinin a cross section in a width direction of the substrate, the front surface portion is smaller in width than a region of the superconducting wire located opposite to the front surface portion.4. The superconducting wire according to claim 1 , whereina back surface portion of the superconducting wire located opposite to the front surface portion has one of a flat shape and a concave shape.5. The superconducting wire according to claim 1 , whereina back surface portion of the superconducting wire located opposite to the front surface portion is curved in a convex shape,the front surface portion is curved in a concave shape, andin a cross section in a width direction ...

DEVICE FOR GENERATING PROPULSION FORCE BY USING A SUPERCONDUCTIVE SOLENOID

Device () for generating propulsive force F consisting of an electrically-supplied superconductive solenoid () generating magnetic flux ϕ with density B, a superconductive magnetic-field shield () covering the solenoid (), means () for cooling the solenoid () and the shield () and a core of high magnetic permeability () around which the solenoid () is wound generating magnetic flux density vectors B and B at the respective ends (α, β) of the core (). The core () includes one or more curved parts so that when the solenoid () operates, the vectors B, B tend to be perpendicular to the respective cross-sections of the ends (α,β), and the alteration of direction of the vector B along each curved part generates force vectors F, F acting perpendicularly to the cross-sections of the ends (α, β), the sum of F and F generates the force F in the device (). 213. Device () for generating propulsive force F according to claim 1 , wherein the high-magnetic-permeability core () has a constant cross-section and is curved along its length.313. Device () for generating propulsive force F according to claim 1 , wherein the high-magnetic-permeability core () has a constant cross-section and includes an elongate part that ends to a curved part at each of its ends (α) and (β).4133. Device () for generating propulsive force F according to claim 3 , wherein the curved part at the end (α) of the high-magnetic-permeability core () is configured to have a direction that is same with that of the curved part at the end (β) of the high-magnetic-permeability core ().5133. Device () for generating propulsive force F according to claim 3 , wherein the curved part at the end (α) of the high-magnetic-permeability core () is configured to have a direction that is opposite to that of the curved part at the end (β) of the high-magnetic-permeability core ().6123. Device () for generating propulsive force F according to claim 1 , wherein the superconductive solenoid () is a type II superconductor such as ...

PRECURSOR FOR A NB3SN SUPERCONDUCTOR WIRE, METHOD FOR MANUFACTURING THE SAME, NB3SN SUPERCONDUCTOR WIRE, AND SUPERCONDUCTING MAGNET SYSTEM

A precursor for a NbSn superconductor wire to be manufactured by the internal diffusion method, includes a plurality of Nb-based single core wires, each of which includes a Nb-based core coated with a Cu-based coating including a Cu-based matrix, a plurality of Sn-based single core wires, each of which includes a Sn-based core coated with a Cu-based coating including a Cu-based matrix; and a cylindrical diffusion barrier including Ta or Nb, in which the plurality of Nb-based single core wires and the plurality of Sn-based single core wires are regularly disposed, wherein the plurality of Nb-based single core wires include Nb-based single core wires having a Cu/Nb ratio of 0.4 or more, wherein the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core. 1. A precursor for a NbSn superconductor wire to be manufactured by the internal diffusion method , comprising:a plurality of Nb-based single core wires, each of which comprises a Nb-based core coated with a Cu-based coating comprising a Cu-based matrix,a plurality of Sn-based single core wires, each of which comprises a Sn-based core coated with a Cu-based coating comprising a Cu-based matrix; anda cylindrical diffusion barrier comprising Ta or Nb, in which the plurality of Nb-based single core wires and the plurality of Sn-based single core wires are regularly disposed,wherein the plurality of Nb-based single core wires comprise Nb-based single core wires having a Cu/Nb ratio of 0.4 or more,wherein the Cu/Nb ratio is a cross sectional area ratio of the Cu-based coating to the Nb-based core.2. The precursor for a NbSn superconductor wire according to claim 1 , wherein a diameter of a region claim 1 , in which Nb-based single core wires having the Cu/Nb ratio of less than 0.4 are adjacent to each other claim 1 , is 300 μm or less.3. The precursor for a NbSn superconductor wire according to claim 1 , further comprises a plurality of segments claim 1 , in each of which Nb-based single ...

Magnet Apparatus

A magnet apparatus which comprises a first vacuum chamber, a second vacuum chamber, a first magnet disposed within the first vacuum chamber such that the first magnet can be thermally isolated from the exterior of the first vacuum chamber, and a load connector extending from the first vacuum chamber into the second vacuum chamber so that a load on the first magnet can be transferred to the second vacuum chamber, wherein the load connector is in thermal contact with the first magnet and can be thermally isolated from the exterior of the first vacuum chamber and the exterior of the second vacuum chamber. 1. A magnet apparatus comprising:a first vacuum chamber;a second vacuum chamber;a first magnet disposed within the first vacuum chamber such that the first magnet is thermally isolatable from the exterior of the first vacuum chamber;a second magnet disposed within the second vacuum chamber;a load connector extending from the first vacuum chamber into the second vacuum chamber so that a load on the first magnet is transferable to the second vacuum chamber, wherein the load connector is in thermal contact with the first magnet and is thermally isolatable from the exterior of the first vacuum chamber and the exterior of the second vacuum chamber,wherein the first vacuum chamber comprises a first sealing arrangement through which the load connector extends and the second vacuum chamber comprises a second sealing arrangement through which the load connector extends, and wherein a third vacuum chamber disposed between the first vacuum chamber and the second vacuum chamber is formed between the first and second sealing arrangements and sealed from the first and second vacuum chambers by the first and second sealing arrangements,wherein the first sealing arrangement comprises a flexible thermally insulating coupling provided between the load connector and an inner wall of the first vacuum chamber, and the second sealing arrangement comprises a flexible thermally insulating ...

SUPERCONDUCTING SHIELD FOR CRYOGENIC CHAMBER

A shield for a cryogenic chamber and a cryogenic chamber comprising a shield are described. In an example embodiment, a cryogenic chamber comprises an interior housing comprising housing walls that define an action chamber. The action chamber is configured to be cryogenically cooled to an action temperature. The cryogenic chamber further comprises an interior shield at least partially sandwiched within the housing walls. The interior shield is made of a first material that acts as a superconductor at the action temperature. 1. A shield for a cryogenic chamber , the shield comprising:an interior shield at least partially sandwiched within housing walls of the cryogenic chamber, the housing walls defining an action chamber, the action chamber configured to be cryogenically cooled to an action temperature, wherein the interior shield is made of a first material that acts as a superconductor at the action temperature.2. The shield of claim 1 , further comprising one or more shield openings.3. The shield of claim 2 , wherein at least one of the one or more shield openings comprises a tube stub extending outward from the interior shield claim 2 , the tube stub made of the material and in electrical contact with the interior shield.4. The shield of claim 1 , wherein the action temperature is a cryogenic temperature.5. The shield of claim 1 , wherein the interior shield is made of one or more metal sheets.6. The shield of claim 1 , further comprising an outer shield at least partially enclosing a main chamber claim 1 , the interior shield being disposed within the main chamber.7. The shield of claim 6 , further comprising an intermediate shield disposed within the main chamber and exterior to the interior shield.8. The shield of claim 6 , wherein the outer shield comprises one or more shield openings and at least one of the one or more shield openings comprises a tube stub extending outward from the outer shield claim 6 , the tube stub made of the material and in electrical ...

Ac-current induced quench protection system

An apparatus ( 100 ) for quenching at least part ( 110 ) of a superconductor in a superconducting state in reply to a quench signal to initiate a transition from the superconducting state into a normal-conducting state comprises: means ( 120 ) for providing an alternating (AC) current of a predetermined strength and/or predetermined frequency to the at least part ( 110 ) of the superconductor, wherein the means ( 120 ) for providing the AC current comprises a control terminal ( 130 ) configured to receive the quench signal. The means ( 120 ) for providing the AC current is configured to be activated in response of receiving the quench signal at the control terminal ( 130 ) so that the AC current flows through the at least part ( 110 ) of the superconductor, wherein the predetermined strength and/or the predetermined frequency is selected such that the transition from the superconducting state into a normal-conducting state is triggered.

SUPERCONDUCTING COIL PROTECTION METHOD AND SUPERCONDUCTING MAGNET DEVICE

An object of the present invention is to provide a method for protecting a superconducting coil, which method prevents damage to the superconducting coil caused by a quench or the like, in a new way, without using a voltage (a change in voltage) generated in the superconducting coil. Provided is the method for protecting a superconducting coil made by winding tape-like superconducting wire having a superconducting layer. Power from a power supply is shut off based on the magnitude of a screening field, which is a difference between a measured magnetic field B in a direction of a thickness of the superconducting wire at a predetermined position, and a magnetic field Bcal in the direction of the thickness of the superconducting wire calculated disregarding an effect of screening current. 1. A method for protecting a superconducting coil made by winding superconducting wire , the method comprising the steps of:measuring a magnitude of a screening field induced by screening current flowing through the superconducting wire which is in a superconducting state; anddecreasing electric current flowing through the superconducting wire based on the measured magnitude of the screening field.2. The method for protecting the superconducting coil according to claim 1 , whereinthe electric current flowing through the superconducting wire is decreased based on the magnitude of the screening field, which is a difference between a measured magnetic field B in a direction of a thickness of the superconducting wire, which is measured at a predetermined position, and a magnetic field Bcal in the direction of the thickness calculated disregarding an effect of the screening current.3. The method for protecting the superconducting coil according to claim 2 , whereinthe electric current flowing through the superconducting wire is decreased based on the magnitude of the screening field at a position near an outer periphery of an axial end of the superconducting coil.4. The method for ...

SUPERCONDUCTIVE WIRE AND CURRENT LIMITER

Provided is a superconductive wire comprising: a superconductive wire core which has a first main surface extending in the longitudinal direction and a second main surface located on the side opposite to the first main surface; a first heat dissipation member disposed on the first main surface; and a second heat dissipation member disposed on the second main surface. The first heat dissipation member is connected to the first main surface at a plurality of first connection locations lined up along the longitudinal direction. The second heat dissipation member is connected to the second main surface at a plurality of second connection locations lined up along the longitudinal direction. In the planar view from the thickness direction of the superconductive wire, each of the plurality of first connection locations and a corresponding one of the plurality of second connection locations are arranged with an offset from each other. 1. A superconductive wire comprising:a superconductive wire core which has a first main surface extending in the longitudinal direction and a second main surface located on the side opposite to the first main surface and extending in the longitudinal direction;a first heat dissipation member disposed on the first main surface; anda second heat dissipation member disposed on the second main surface,the first heat dissipation member being connected to the first main surface at a plurality of first connection locations which are lined up along the longitudinal direction,the second heat dissipation member being connected to the second main surface at a plurality of second connection locations which are lined up along the longitudinal direction,in a planar view from the thickness direction of the superconductive wire, each of the plurality of first connection locations and a corresponding one of the plurality of second connection locations are arranged with an offset from each other.2. The superconductive wire according to claim 1 , whereinin the ...

DUAL WINDING SUPERCONDUCTING MAGNETIC ENERGY STORAGE

A superconducting magnetic energy storage system (SMES). The SMES includes a toroidally wound super conducting magnet having a toroidal magnetic core with a charging winding and a discharging winding. The charging winding and discharging winding are wound on the toroidal magnetic core. The SMES also includes a DC power source, the DC power source operable to provide DC current to the charging winding of the toroidally wound superconducting magnet, and a modulator operably connected to the DC power source and the charging winding, the modulator operable to modulate at least a portion of the DC current applied to the charging winding of the superconducting magnet. The energy is stored in a magnetic field of the superconducting magnet by applying a current to the charging winding of the superconducting magnet, and energy is withdrawn from the magnetic field by a current flowing in the discharging winding. 1. A superconducting magnetic energy storage system (SMES) , the SMES comprising:a toroidally wound super conducting magnet having a toroidal magnetic core;a charging winding;a discharging winding wherein the charging winding and discharging winding are wound on the toroidal magnetic core;a DC power source, the DC power source operable to provide DC current to the charging winding of the toroidally wound superconducting magnet; anda modulator operably connected to the DC power source and the charging winding, the modulator operable to modulate at least a portion of the DC current applied to the charging winding of the superconducting magnet; andwherein energy is stored in a magnetic field of the superconducting magnet by applying a current to the charging winding, and energy is withdrawn from the magnetic field by a current flowing in the discharging winding.2. The SMES of claim 1 , further including an AC load operably connected to the discharge winding.3. The SMES of claim 2 , wherein the AC load is at least one of a grid power system and a microgrid power system.4. ...

SUPERCONDUCTOR CURRENT LEADS

A current lead for supplying current to a superconducting device, the current lead having a high temperature superconductor (HTS) conductor extending along a length of the current lead, the HTS conductor thermally and electrically joined to an electrical shunt. Voltage taps are connected to respective ends of the HTS conductor for connection to a quench heater in thermal contact with a superconducting device. A quench in the HTS conductor gives rise to a voltage appearing between the voltage taps, and the voltage is applied to the quench heater to give rise to quench within the superconducting device. 1. A current lead for supplying current to a superconducting device , the current lead having a high temperature superconductor (HTS) conductor extending along a length of the current lead , the HTS conductor being thermally and electrically joined to an electrical shunt , wherein voltage taps are connected to respective ends of the HTS conductor for connection to a quench heater in thermal contact with the superconducting device , whereby a quench in the HTS conductor causes a voltage between the voltage taps , and the voltage is applied to the quench heater to give rise to quench within the superconducting device.2. A current lead according to wherein the electrical shunt comprises stainless steel.3. A current lead according to claim 1 , wherein a section of the HTS conductor is isothermal with a high heat capacity mass.4. A current lead according to claim 1 , wherein the electrical shunt is connected along the full length of the HTS conductor.5. A current lead according to claim 4 , wherein the HTS conductor is soldered along its length to the electrical shunt by an indium-based solder.6. A current lead according to claim 1 , wherein a first of the voltage taps comprises copper and a second of the voltage taps comprises brass claim 1 , and wherein claim 1 , in use claim 1 , the first voltage tap is at a lower temperature than the second voltage tap.7. A current lead ...

Method of Reducing Multipole Content In A Conductor Assembly During Manufacture

A method for manufacture of a conductor assembly. The assembly is of the type which, when conducting current, generates a magnetic field or in which, in the presence of a changing magnetic field, a voltage is induced. In an example embodiment one or more first coil rows are formed. The assembly has multiple coil rows about an axis with outer coil rows formed about inner coil rows. A determination is made of deviations from specifications associated with the formed one or more first coil rows. One or more deviations correspond to a magnitude of a multipole field component which departs from a field specification. Based on the deviations, one or more wiring patterns are generated for one or more second coil rows to be formed about the one or more first coil rows. The one or more second coil rows are formed in the assembly. The magnitude of each multipole field component that departs from the field specification is offset 1. A fabrication method which suppresses generation of unwanted multipole field orders in a conductor assembly comprising multiple coil rows about an axis wherein outer coil rows are formed about inner coil rows , and inner and outer ones of the coil rows comprise conductor formed about the axis in a helical pattern , comprising:after forming one or more first inner coil rows, forming one or more outer coil rows, wherein the process of forming the one or more outer coil rows includes introducing a modulation into the one or more outer coil rows to reduce the magnitude of one or more multipole field components relative to a main field component.2. The method of wherein the step of introducing is performed after determining one or more deviations from a multipole field specification by the one or more inner coil rows3. The method of wherein a deviation claim 2 , corresponding to a magnitude of a multipole field component which departs from a field specification claim 2 , is determined by performing field measurements.4. The method of wherein the ...

Superconducting flat tape cable magnet

A method for winding a coil magnet with the stacked tape cables, and a coil so wound. The winding process is controlled and various shape coils can be wound by twisting about the longitudinal axis of the cable and bending following the easy bend direction during winding, so that sharp local bending can be obtained by adjusting the twist pitch. Stack-tape cable is twisted while being wound, instead of being twisted in a straight configuration and then wound. In certain embodiments, the straight length should be half of the cable twist-pitch or a multiple of it. 1. A method of winding a superconductor cable comprising a plurality of flat , tape-shaped ribbon superconductor wires assembled to form a stack having a rectangular cross-section and a longitudinal axis , said method comprising:providing a support surface about which said cable is to be wound, said support surface having at least one substantially non-linear region and at least one substantially linear region;winding said cable about said support surface by bending said cable about said substantially non-linear region without twisting said cable, and twisting said cable in said substantially linear region about said longitudinal axis.2. The method of claim 1 , wherein said twisting of said cable produces a twist pitch claim 1 , and wherein said linear region has a length claim 1 , and wherein said cable is twisted such that said length is half of said twist-pitch of said cable or a multiple thereof claim 1 , wherein the multiplier is an integer.3. The method of claim 1 , wherein said supporting surface has a plurality of non-linear regions spaced apart by linear regions.4. The method of claim 1 , wherein said support surface is shaped as a polygon.5. The method of claim 4 , wherein said polygon is selected from the group consisting of a triangle claim 4 , rectangle claim 4 , pentagon claim 4 , hexagon and octagon.6. The method of claim 1 , wherein said superconductor cable is enclosed within a flexible sheath ...

LAYOUT FOR MAGNET COILS WOUND WITH ANISOTROPIC SUPERCONDUCTOR, AND METHOD FOR LAYING OUT THE SAME

A layer wound magnet coil includes a central coil region and end coil regions adjoining the central coil region along an axial line of symmetry. The central coil region includes layers of coil windings of an anisotropic material. The end coil regions include layers of coil windings of the anisotropic superconducting material interspersed with layers of non-superconducting material. 2. The coil arrangement according to claim 1 , wherein the number of windings of the anisotropic superconductor in the fourth coil region or the number of windings of the anisotropic superconductor in the fifth coil region decreases toward the first axial edge or the second axial edge claim 1 , respectively claim 1 , in discrete steps along the axis of symmetry.3. The coil arrangement according to claim 1 , wherein the number of windings of the anisotropic superconductor in the fourth coil region or the number of windings of the anisotropic superconductor in the fifth coil region decreases toward the first axial edge or the second axial edge quasi-continuously along the axis of symmetry (z).4. The coil arrangement according to claim 1 , wherein windings in the first coil region are wound from a single claim 1 , continuous superconductor piece.5. The coil arrangement according to claim 1 , wherein the second coil region is wound with at least 20% fewer conductor windings than an axially adjoining coil region of the same geometry.6. The coil arrangement according to claim 5 , wherein the second coil region is wound with 40% to 60% fewer conductor windings than the axially adjoining coil region of the same geometry.7. The coil arrangement according to claim 6 , wherein the second coil region is wound with 50% fewer conductor windings than the axially adjoining coil region of the same geometry.8. The coil arrangement according to claim 1 , wherein the maximum of the field component Bin the windings of the anisotropic superconductor is at least 10% lower than a field component Bin the ...

SUPERCONDUCTING MAGNETS WITH THERMAL RADIATION SHIELDS

A cylindrical superconducting magnet has a number of axially-aligned annular coils of superconducting wire, arranged for cooling by thermal conduction through a cooled surface in mechanical contact with the coils. The coils are provided with a cryogenic radiation shield located between respective radially inner surfaces of the coils and respective axes of the coils. The cryogenic radiation shield is formed of a metal layer in thermal contact with the cooled surface. 1. A cylindrical superconducting magnet structure , comprising:a plurality of resin-impregnated, axially aligned annular coils of superconducting wire, each coil having an axis around which the coil is wound, and a radially outer surface and a radially inner surface;a tubular support structure at least partially surrounding the respective radially outer surfaces of said annular coils and having a larger diameter than said radially outer surfaces, each of said annular coils exhibiting a thermal resistance between the respective annular coil and the tubular support structure;a cooling arrangement in thermal communication with said tubular support structure that cools at least said tubular support structure to a cryogenic temperature; anda cryogenic radiation shield between the respective radially inner surfaces of the annular coil and the respective axes of the annular coils, said cryogenic radiation shield comprising a conformal layer of metal foil applied over the radially inner surface of each of said annular coils, and an electrically and thermally insulating layer interposed between each of said annular coils and said metal foil layer, and wherein said conformal layer of metal foil is also applied over axially facing surfaces of each of said annular coils, with said electrically and thermally insulating layer also interposed between each annular facing surface of each coil and said metal foil layer, with a thermal resistance between each metal foil layer and said tubular support structure being less ...

SUPERCONDUCTING MAGNET

A discharge pipe is connected to a refrigerant container from outside of a vacuum container, and discharges a vaporized refrigerant. A pair of external leads are electrically connected respectively to opposite ends of a superconducting coil from a position outside of the vacuum container, so as to cause a current to flow through the superconducting coil. A protection circuit is electrically connected to the superconducting coil, and consumes energy stored in the superconducting coil during quenching. The protection circuit is in contact with the discharge pipe outside of the vacuum container. 1. A superconducting magnet comprising:a superconducting coil;a refrigerant container to contain the superconducting coil in a state where the superconducting coil is immersed in a liquid refrigerant;a vacuum container to contain the refrigerant container;a discharge pipe connected to the refrigerant container from outside of the vacuum container, the discharge pipe discharging the refrigerant that has been vaporized;a pair of external leads electrically connected respectively to opposite ends of the superconducting coil from a position outside of the vacuum container, so as to cause a current to flow through the superconducting coil; anda protection circuit electrically connected to the superconducting coil, the protection circuit consuming energy stored in the superconducting coil during quenching,the protection circuit being in contact with the discharge pipe outside of the vacuum container, whereinthe protection circuit is wrapped around the discharge pipe outside of the vacuum container,the discharge pipe has a helical groove formed on its outer circumferential surface, with a direction in which the discharge pipe extends as an axial direction of a central axis of the groove, andthe protection circuit is wrapped around the discharge pipe so as to be located within the groove.2. (canceled)3. (canceled)4. The superconducting magnet according to claim 1 , whereinthe ...

SUPERCONDUCTING MAGNET SYSTEM

A superconducting magnet system including a coil former, superconducting coils supported by the coil former, and one or more thermally conductive tubes. The one or more thermally conductive tubes are embedded inside of the coil former. The one or more thermally conductive tubes are in thermal contact with the coil former and arranged to receive a cryogen. 1. A superconducting magnet system , comprising:a coil former;superconducting coils supported by the coil former; andone or more thermally conductive tubes embedded inside of the coil former, the one or more thermally conductive tubes being in thermal contact with the coil former and arranged to receive a cryogen.2. The superconducting magnet system of claim 1 , wherein the one or more thermally conductive tubes comprise a material having a higher melting point than a melting point of a material of the coil former.3. The superconducting magnet system of claim I claim 1 , wherein the one or more thermally conductive tubes are in physical contact with the coil former.4. The superconducting magnet system of claim 1 , wherein the one or more thermally conductive tubes comprise an inner layer and an outer layer claim 1 , the outer layer being in physical contact with the inner layer and metallurgically bonded with the coil former.5. The superconducting magnet system of claim 4 , wherein a material of the inner layer has a higher melting point than a melting point of a material of the outer layer.6. The superconducting magnet system of claim 4 , wherein a material of the outer layer has a larger thermal expansion coefficient than a thermal expansion coefficient of a material of the inner layer.7. The superconducting magnet system of claim 4 , wherein the material of the coil former comprises aluminum claim 4 , a material of the inner layer comprises stainless steel claim 4 , and a material of the outer layer comprises copper or brass.8. The superconducting magnet system of claim 1 , wherein the coil former comprises one ...

METHOD FOR ADJUSTING MAGNETIC RESONANCE IMAGING APPARATUS AND SUPERCONDUCTIVE MAGNET EXCITATION DOCK

An adjustment method of a magnetic resonance imaging apparatus includes: a cooling and excitation step in which work of transporting a superconducting magnet to a facility different from a facility where the superconducting magnet is to be installed, cooling a superconducting coil of the superconducting magnet with a refrigerant, and supplying a current from an external power supply for excitation is repeated until a predetermined rated current flows; a demagnetization and transportation step of demagnetizing the superconducting coil and transporting the superconducting magnet to the facility where the superconducting magnet is to be installed in a state where the superconducting coil is cooled by the refrigerant; and an installation step of installing the superconducting magnet in the facility where the superconducting magnet is to be installed and supplying a predetermined rated current from an external power supply to the superconducting coil in order to excite the superconducting coil. 116-. (canceled)17. An adjustment method of a magnetic resonance imaging apparatus including a superconducting magnet , comprising:a cooling and excitation step of temporarily installing the superconducting magnet, which is manufactured in advance and then is transported to a work facility site, at the work site facility and cooling a superconducting coil of the superconducting magnet with a refrigerant, wherein, at the work site facility, supplying a current from an external power supply for excitation to the superconducting coil is executed until a predetermined rated current flows; anda demagnetization and transportation step of demagnetizing the superconducting coil excited by the rated current as a preliminary step and transporting the superconducting magnet from the work site facility in a state where the superconducting coil is cooled by the refrigerant.18. The adjustment method according to claim 17 ,wherein a plant for condensing helium gas to liquid helium, a frame on ...

SUPERCONDUCTING MAGNET COIL SYSTEM

The invention relates to a superconducting magnet coil system comprising a first electrical mesh (M) and a second electrical mesh (M), which are interconnected in series with one another, wherein the first electrical mesh (M) comprises in a first path an HTS (high temperature superconductor) coil section (A) and, in series therewith, a first main coil section (A) and in a second path a quench protection element (Q), which bridges the series connection of HTS coil section (A) and first main coil section (A). The first main coil section (A) comprises a conductor comprising superconducting filaments in a matrix. The second electrical mesh (M) comprises a neighbouring main coil section (A) comprising a conductor comprising superconducting filaments in a matrix. The neighbouring main coil section (A) is that main coil section of an electrical mesh different from the first electrical mesh which, in a radial direction outwards, lies closest to the first main coil section (A) of the first electrical mesh. The magnet coil system is characterized in that, in the case of a quench, the conductors of the main coil sections (A, A, A) each generate a specific power input (LT/2π)*1/ρ, wherein the specific power input of the conductor of the first main coil section (A) of the first electrical mesh (M) is higher than the specific power input of the conductor of the neighbouring main coil section (A) of the second electrical mesh (M). Consequently, using HTS superconductor material, it is possible to provide a magnet coil system with which particularly high field strengths can be generated and/or which has a small structural size. 1. A superconducting magnet coil system having a plurality of electrical meshes interconnected in series , the system comprising:a first electrical meshhaving, in a first path, an HTS coil section and, in a series connection therewith, a first main coil section with a conductor comprising superconducting filaments in a matrix, and having, in a second path, a ...

APPARATUS AND METHOD FOR CURRENT CONDITIONING, USING A PRIMARY COIL COUPLED TO SECONDARY COILS OF SUPERCONDUCTING MATERIAL, WITH SMOOTHED TRANSITIONS

An apparatus () for current conditioning, having—a primary coil () of electrically conducting material, and—a plurality of secondary coils (-) of superconductor material, with the secondary coils inductively coupled to the primary coil, wherein at least a part of the secondary coils are arranged laterally shifted to each other with respect to a direction () of a primary magnetic flux () of the primary coil. At least a part of the secondary coils are arranged axially shifted to each other with respect to the direction () of a primary magnetic flux () of the primary coil (). At least for the part of the secondary coils that are laterally shifted to each other, electrically insulating material () is provided between the secondary coils. The current conditioning apparatus allows a smoother increase of the inductance of the primary coil when the primary current increases. 1. An apparatus for current conditioning , comprising:a primary coil of electrically conducting material, and wherein at least the secondary coils of a first part of the secondary coils are arranged laterally shifted with respect to each other in a direction of a primary magnetic flux of the primary coil,', 'wherein at least the secondary coils of a second part of the secondary coils are arranged axially shifted with respect to each other in the direction of the primary magnetic flux of the primary coil, and, 'a plurality of secondary coils of superconductor material, with the secondary coils inductively coupled to the primary coil,'}electrically insulating material provided between each of the secondary coils of the first part of the secondary coils.2. The apparatus according to claim 1 ,wherein the secondary coils are arranged in a plurality of layers which are arranged successively with respect to each other along the direction of the primary magnetic flux of the primary coil, with each layer comprising plural ones of the secondary coils,wherein in at least one of the layers, at least some of the ...

METHOD FOR CHARGING AN HTS SHIM DEVICE AND MAGNET ARRANGEMENT

A method for charging an HTS shim device in a cryostat having a room temperature bore using a charging device. A shim switch temporarily interrupts the superconducting state in a section of an HTS shim conductor path. The charging device includes a primary circuit with a normal-conducting charging coil and the conductor path forms a secondary circuit. A current change in the secondary circuit results from a change in magnetic flux generated by the charging coil through the secondary circuit. In a first phase the shim switch is opened to interrupt the superconducting state in a section of the conductor path, the charging coil is positioned in the bore, and the current in the primary circuit is changed; in a second phase, the conductor path is superconductingly closed; in a third phase, the current in the primary circuit is changed and/or the charging coil is removed from the bore. 1. A method for charging a high-temperature superconductor (HTS) shim device of a superconducting magnet coil system arranged in a cryostat having a room temperature bore with a charging device , the HTS shim device comprising at least one superconductingly closed HTS shim conductor path (C , C , . . . , C) and a shim switch (S , S , . . . , S) configured to temporarily interrupt the superconducting state in a section of the HTS shim conductor path ,{'sub': 1', 'm, 'wherein the charging device comprises at least one normal-conducting charging coil (P, P, . . . , P), at least one power supply and supply lines and forms at least one primary circuit, and the HTS shim device forms at least one secondary circuit, and'}{'sub': 1', 'm', '1', 'n, 'claim-text': [{'b': '1', 'sub': 1', 'n', '1', 'n', '1', 'm, 'in a first phase (Ph) in any order, at least temporarily opening the shim switch (S, S, . . . , S) for interrupting the superconducting state in a section of the HTS shim conductor path (C, C, . . . , C), positioning the charging coil (P, P, . . . , P) in the room temperature bore of the ...

Magnet Apparatus

A magnet apparatus which comprises a first vacuum chamber, a second vacuum chamber, a first magnet disposed within the first vacuum chamber such that the first magnet can be thermally isolated from the exterior of the first vacuum chamber, and a load connector extending from the first vacuum chamber into the second vacuum chamber so that a load on the first magnet can be transferred to the second vacuum chamber, wherein the load connector is in thermal contact with the first magnet and can be thermally isolated from the exterior of the first vacuum chamber and the exterior of the second vacuum chamber. 1. A magnet apparatus comprising:a first vacuum chamber;a second vacuum chamber;a first magnet disposed within the first vacuum chamber such that the first magnet is thermally isolatable from the exterior of the first vacuum chamber;a load connector extending from the first vacuum chamber into the second vacuum chamber so that a load on the first magnet is transferable to the second vacuum chamber, wherein the load connector is in thermal contact with the first magnet and is thermally isolatable from the exterior of the first vacuum chamber and the exterior of the second vacuum chamber,further comprising a cap for the load connector, wherein the first vacuum chamber comprises a sealing arrangement through which the load connector extends, and wherein the second vacuum chamber is provided between the cap and the sealing arrangement.2. The apparatus of further comprising a radiation shield provided between the load connector and the cap.3. The apparatus of further comprising a further radiation shield between the first magnet and an inner wall of the first vacuum chamber.4. The apparatus of wherein the radiation shield provided between the load connector and the cap is thermally coupled to the radiation shield in the first vacuum chamber.5. The apparatus of wherein a first thermally insulating coupling is provided between the load connector and said further radiation ...

No-Insulation Multi-Width Winding for High Temperature Superconducting Magnets

An HTS magnet having a stack of a plurality of double-pancake (DP) coils is disclosed, with each DP coil having a first superconducting coil and a second superconducting coil. The plurality of DP coils have varying widths, with DP coils with the widest widths at the top and bottom of the stack, and DP coils with the narrowest coils located substantially at a midpoint of the stack. The DP coils omit turn-to-turn insulation, or have minimal turn-to-turn insulation. 1. A high temperature superconducting magnet comprising: a first pancake coil wound of a plurality of adjoining winding turns of a superconductor material into a cylindrical structure; and', 'a second pancake coil wound of a plurality of adjoining winding turns of said superconductor material into a cylindrical structure,', 'wherein said first pancake coil is stacked upon said second pancake coil, and said first pancake coil and said second pancake coil each omit a turn-to-turn insulation, and, 'a stack of a plurality of double-pancake (DP) coils, each DP coil comprising a first DP coil having a first width and a first amount of superconductor disposed at a top of said stack;', 'a second DP coil having a second width and a second amount of superconductor disposed at a bottom of said stack; and', 'a third DP coil having a third width and a third amount of superconductor disposed substantially at a midpoint of said stack,, 'said stack comprisingwherein said first amount of superconductor is substantially equal to said second amount of superconductor, said third amount of superconductor is substantially less than said first amount of superconductor, said first width is substantially equal to said second width, and said third width is substantially narrower than said first width.2. (canceled)3. The device of claim 1 , wherein said plurality of DP coils substantially omit stabilizer conductor.4. The device of claim 1 , wherein said plurality of DP coils each have a substantially similar outer diameter.5. The ...

WIRELESS POWER CHARGING APPARATUS USING SUPERCONDUCTING COIL

Wireless power transmitting and receiving apparatuses are described, using a superconducting coil for a resonant coil, and wireless power charging systems using the same. Wireless power charging systems described include a power source, a wireless power transmitter connected with the power source, a wireless power receiver, and a battery connected with the wireless power receiver. The wireless power transmitter includes a source coil connected with the power source, a superconducting transmitting coil into which electricity is induced by a magnetic field generated when electricity flows through the source coil, and a first conductive cooling device connected with the superconducting transmitting coil. The wireless power receiver includes a superconducting receiving coil that uses frequency resonance between the coils, a load coil into which electricity is induced by a magnetic field generated when electricity flows through the superconducting receiving coil, and a second conductive cooling device connected with the superconducting receiving coil. 2. The wireless power charging system of claim 1 , wherein the superconducting transmitting coil is spirally wound claim 1 , and the source coil is arranged to surround the outside of the spirally wound superconducting transmitting coil.3. The wireless power charging system of claim 1 , wherein the wireless power transmitter comprises:a first temperature sensor sensing a temperature of the superconducting transmitting coil; anda first controller controlling the first conductive cooling device such that the temperature of the superconducting transmitting coil is maintained at a threshold temperature or lower, based on the temperature measured by the first temperature sensor.4. The wireless power charging system of claim 1 , wherein the source coil is a superconducting coil claim 1 , and the first conductive cooling device is connected with the superconducting source coil and cools the superconducting source coil.5. The ...

Superconducting Magnet and Nuclear Magnetic Resonance Device

There is provided a superconducting magnet in which magnetization caused by a shielding current of a superconducting winding is eliminated whereby the current to be supplied to the superconducting winding is uniformized, and thus uniformity of the central magnetic field is secured. The superconducting magnet has a superconducting winding composed of a superconductor, and an outer AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an outer side the superconducting winding; and an AC current is supplied to the outer AC winding thereby applying an AC magnetic field in a direction perpendicular to a direction of magnetization caused in the superconducting winding by the shielding current, and thus the magnetization is eliminated. Also, the superconducting magnet has an inner AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an inner side of the superconducting winding layer. 1. A superconducting magnet , comprising:a superconducting winding composed of a superconductor; and a magnetic field application unit configured to apply an AC magnetic field in a direction perpendicular to a direction of magnetization caused by a shielding current in the superconducting winding.2. The superconducting magnet according to claim 1 , whereinthe magnetic field application unit applies the AC magnetic field; and has an AC winding to which an AC current is supplied so that current flow directions at an outer side of the superconducting winding and at an inner side thereof are opposite to each other.3. The superconducting magnet according to claim 2 , whereinthe magnetic field application unit has an outer AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an outer side of the superconducting winding; and an AC current is supplied to the outer AC winding.4. The superconducting magnet according to ...

Electromagnetic Pulse Source Using Quenching Superconducting Magnet

An electromagnetic pulse source comprises a superconducting magnet comprising a coil of superconducting material. At least a portion of the windings of the coil are separated by an electric conductor. A charging circuit is coupled to the two terminals to drive a current through the coil to charge the superconducting magnet and configured to charge the coil to a condition such that the coil enters a quench condition where current flows from one turn of the coil to another turn of the coil through the electric conductor. The quench event may cause a loss of inductance and resulting electromagnetic radiation. A receiver circuit comprising an inductive element is positioned so that the inductive element is mutually-coupled to the coil and the electromagnetic radiation causes a voltage to be induced across the inductive element. 1. A system comprising:a superconducting magnet comprising a coil of superconducting material, the coil comprising two electrical terminals, wherein at least a portion of the windings of the coil are separated by an electric conductor;a charging circuit coupled to the two terminals to drive a current through the coil to charge the superconducting magnet, and configured to charge the coil to a condition such that the coil enter a quench condition where current flows from one turn of the coil to another turn of the coil through the electric conductor, wherein a loss of inductance due to the quench condition causes electromagnetic radiation; anda receiver circuit comprising an inductive element positioned so that the inductive element is mutually-coupled to the coil and the electromagnetic radiation causes a voltage to be induced across the inductive element.2. The system of wherein the charging circuit comprises a current source to drive current through the coil.3. The system of wherein the charging circuit is configured to drive a current through the coil that exceeds a superconducting threshold of the coil to initiate the quench condition.4. The ...

FAST INDUCTIVE HEATERS FOR ACTIVE QUENCH PROTECTION OF SUPERCONDUCTING COIL

An active quench protection system for a superconducting coil in a magnet includes a quench detector. An inductive heating device is configured to generate an electric field to inductively heat a portion of the superconducting coil. A processor can generate a quench signal responsive to the detection of a quench by the quench detector to cause the inductive heating device to generate the electric field to inductively heat a portion of the superconducting coil. A quench power source can supply a time varying current to the inductive heating device to generate the electric field responsive to a quench signal from the processor. A magnet and a method for the active quench protection of a superconducting coil in a magnet are also disclosed. 1. An active quench protection system for a superconducting coil in a magnet , comprising:a quench detector;an inductive heating device configured to generate an electric field to inductively heat a portion of the superconducting coil;a processor for generating a quench signal responsive to the detection of a quench by the quench detector to cause the inductive heating device to generate the electric field to inductively heat a portion of the superconducting coil; and,a quench power source for supplying a time varying current to the inductive heating device to generate the electric field responsive to a quench signal from the processor.2. The quench protection system of claim 1 , wherein the inductive heating device comprises circular coiled conductor portions.3. The quench protection system of claim 1 , wherein the inductive heating device comprises radial conductor portions.4. The quench protection system of claim 1 , wherein the inductive heating device comprises circular dipole conductor portions.5. The quench protection system of claim 1 , wherein the inductive heating device comprises a planar conductor portion.6. The quench protection system of claim 1 , wherein the inductive heating device generates an oscillating electric ...

SUPERCONDUCTING WIRE AND SUPERCONDUCTING COIL

A superconducting wire has a tape-like shape, and includes a superconducting layer. An amount of heat required to raise temperature from 77 K to 300 K, for a unit region having a length of 1 m and a width of 4 mm in the superconducting wire, is more than or equal to 200 J and less than or equal to 500 J. 1. A superconducting wire with a tape-like shape , comprising a superconducting layer , whereinan amount of heat required to raise temperature from 77 K to 300 K, for a unit region having a length of 1 m and a width of 4 mm in the superconducting wire, is more than or equal to 200 J and less than or equal to 500 J.2. The superconducting wire according to claim 1 , wherein the superconducting wire has a mean thermal conductivity at a temperature of 77 K of more than or equal to 100 W/(m·K).3. The superconducting wire according to claim 1 , whereinthe superconducting wire comprises a substrate layer having a first surface and a second surface opposite to the first surface,the superconducting layer has a third surface and a fourth surface opposite to the third surface, and is disposed on the substrate layer such that the third surface faces the second surface, andthe superconducting wire further comprises a coating layer disposed on the first surface and on the fourth surface.4. A superconducting coil comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the superconducting wire according to ; and'}an insulator, whereinthe superconducting wire is wound to have a spiral shape with a space being interposed between windings of the superconducting wire, andthe space is filled with the insulator. The present invention relates to a superconducting wire and a superconducting coil.Conventionally, a superconducting wire disclosed in Japanese Patent Laying-Open No. 2015-28912 (PTL 1) has been known. The superconducting wire described in PTL 1 includes a substrate, a superconducting layer disposed on a main surface of the substrate with an intermediate layer being ...

SUPERCONDUCTING MAGNET WITH IMPROVED THERMAL AND ELECTRICAL STABILITIES AND METHOD FOR MANUFACTURING THE SAME

Disclosed is a superconducting magnet with improved thermal and electrical stabilities and a method for manufacturing the same. The superconducting magnet includes a bobbin disposed at a center of the superconducting magnet, a superconducting winding wound around an outer face of the bobbin, and an epoxy impregnated at an exterior of the superconducting winding, wherein the epoxy contains carbon nanotubes. 1. A superconducting magnet comprising:a bobbin defining a central portion of the superconducting magnet;a superconducting winding wound around an outer face of the bobbin; andan epoxy surrounding the superconducting winding such that the superconducting winding is impregnated in the epoxy,wherein the epoxy contains carbon nanotubes.2. The superconducting magnet of claim 1 , wherein the carbon nanotubes are subjected to surface treatment such that the carbon nanotubes are dispersed in the epoxy.3. The superconducting magnet of claim 2 , wherein the surface-treatment of the carbon nanotubes includes heat-treating the carbon nanotubes in a solution containing sulfuric acid and nitric acid to form a COOH functional group on surfaces of the carbon nanotubes.4. The superconducting magnet of claim 1 , wherein a content of the carbon nanotubes is in a range of 0.1 to 5 wt % based on a total weight of the epoxy.5. A method for manufacturing a superconducting magnet claim 1 , the method comprising:providing a bobbin defining a central portion of the superconducting magnet;winding a superconducting wire around an outer face of the bobbin to form a superconducting winding; andimpregnating the superconducting winding with an epoxy such that the epoxy surrounds the superconducting winding,wherein the epoxy contains carbon nanotubes.6. The method of claim 5 , wherein the carbon nanotubes are subjected to surface treatment such that the carbon nanotubes are dispersed in the epoxy at an increased dispersity.7. The method of claim 6 , wherein the surface-treatment of the carbon ...

DEVICE FOR DETECTING QUENCH IN SUPERCONDUCTING COIL

A device for detecting a quench in a superconducting coil according to one aspect of the invention includes a first superconducting coil and a second superconducting coil that are connected in series. The first superconducting coil and the second superconducting coil have the same shape. A first axis of the first superconducting coil and a second axis of the second superconducting coil are arranged at the same position and in the same direction, and the position of the first superconducting coil and the position of the second superconducting coil in the direction of the first and second axes are the same. The length of a winding wire of the first superconducting coil and the length of a winding wire of the second superconducting coil are equal to each other. 1. A device for detecting a quench in a superconducting coil comprising:a first superconducting coil and a second superconducting coil that are connected in series,an intermediate tap is provided between the first superconducting coil and the second superconducting coil,wherein the first superconducting coil and the second superconducting coil have the same shape,wherein a first axis of the first superconducting coil and a second axis of the second superconducting coil are arranged at the same position and in the same direction, and a position of the first superconducting coil and a position of the second superconducting coil in the direction of the first and second axes are the same, andwherein a length of a winding wire of the first superconducting coil and a length of a winding wire of the second superconducting coil are equal to each other.2. The device for detecting a quench in a superconducting coil according to claim 1 ,wherein the winding wire of the first superconducting coil and the winding wire of the second superconducting coil are adjacent to each other.3. The device for detecting a quench in a superconducting coil according to claim 2 ,wherein the winding wire of the first superconducting coil and ...

CONDUCTIVE COOLING-TYPE PERSISTENT CURRENT SWITCH, MRI APPARATUS AND NMR APPARATUS

A technical problem is to turn a persistent current switch on and off at high speed with less heat input. The invention relates to a conductive cooling-type persistent current switch, including: a superconductive wire through which a current is passed; a cooling stage which cools the superconductive wire; and a heater which heats the superconductive wire, wherein the superconductive wire is placed between faces which are each formed by the cooling stage and the heater, a core of the superconductive wire is magnesium diboride , and a base material placed around an outer periphery of the core is a material having a resistivity of 10 μΩcm or more at 40 K. 1. A conductive cooling-type persistent current switch , comprising:a superconductive wire through which a current is passed;a cooling stage which cools the superconductive wire; anda heater which heats the superconductive wire, whereinthe superconductive wire is placed between faces which are each formed by the cooling stage and the heater, a core of the superconductive wire is magnesium diboride, and a base material placed around an outer periphery of the core is a material having a resistivity of 10 μΩcm or more at 40 K.2. The conductive cooling-type persistent current switch according to claim 1 , wherein a thermal resistor is placed between the cooling stage and the wire.3. The conductive cooling-type persistent current switch according to claim 1 , wherein the base material is niobium-titanium or stainless steel.4. The conductive cooling-type persistent current switch according to claim 2 , wherein the thermal resistor is a resin or FRP.5. The conductive cooling-type persistent current switch according to claim 1 , wherein an a-axis length of a crystalline structure of the magnesium diboride is within a range of 0.3062 to 0.3080 nm.6. The conductive cooling-type persistent current switch according to claim 1 , wherein the core comprises magnesium oxide.7. The conductive cooling-type persistent current switch ...

APPARATUS AND METHODS FOR CHANGING THE MAGNETISATION OF A SUPERCONDUCTOR

A superconducting circuit having: a charging loop; a load loop including a superconductor; a superconducting connection which is simultaneously part of the charging loop and the load loop; and a controller to control a state of the connection between a first and second conductive states. In both the first and second states the connection is in a superconducting state, but a resistance or impedance of the superconducting connection is higher in the first conductive state than in the second conductive state such that the superconducting circuit is configured to induce flux flow between the charging loop and the load loop when the connection is its first conductive state, and inhibits flux flow between the charging loop and the load loop when the connection is its second conductive state; in particular wherein the superconducting connection operates in a flux flow regime in the first conductive state. 1. A superconducting circuit comprising:a charging loop;a load loop comprising a superconductor;a superconducting connection which is simultaneously part of said charging loop and said load loop; anda controller to control a state of said connection between a first conductive state and a second conductive state wherein in both said first and second states the connection is in a superconducting state, and wherein a resistance or impedance of said superconducting connection is higher in said first conductive state than in said second conductive state;such that said superconducting circuit is configured to induce flux flow between said charging loop and said load loop when said connection is in said first conductive state, and to inhibit flux flow between said charging loop and said load loop when said connection is in said second conductive state.2. The superconducting circuit as claimed in claim 1 , wherein said superconducting connection operates in a flux flow regime in said first conductive state.3. The superconducting circuit as claimed in claim 1 , wherein said ...

Spiral-Grooved, Stacked-Plate Superconducting Magnets And Related Construction Techniques

Described herein are concepts, system and techniques which provide a means to construct robust high-field superconducting magnets using simple fabrication techniques and modular components that scale well toward commercialization. The resulting magnet assembly—which utilizes non-insulated, high temperature superconducting tapes (HTS) and provides for optimized coolant pathways—is inherently strong structurally, which enables maximum utilization of the high magnetic fields available with HTS technology. In addition, the concepts described herein provide for control of quench-induced current distributions within the tape stack and surrounding superstructure to safely dissipate quench energy, while at the same time obtaining acceptable magnet charge time. The net result is a structurally and thermally robust, high-field magnet assembly that is passively protected against quench fault conditions. 1. A stacked-plate magnet assembly comprising:a first electrically conductive plate having provided therein at least one groove having a spiral shape;a second electrically conductive plate disposed over said first plate, said second plate having provided at least a groove having a spiral shape such that when a first surface of the first plate is disposed over a first surface of the second plate, said grooves form a spiral channel having an opening at a first end thereof on the first plate, a helical shaped path to the second plate, and an out-going path on the second electrically conductive plate;an electrically insulating material disposed between the first and second plates;a non-insulated (NI) high temperature superconductor (HTS) tape stack having a length such that said NI HTS tape stack may be disposed in the channel formed by the grooves of said first and second electrically conductive plates such that said NI HTS tape stack forms a continuous path from a first outer-most surface of the first electrically conductive plate to a second outer-most surface of the second ...