Cold mass cryogenic cooling circuit inlet path avoidance of direct conductive thermal engagement with substantially conductive coupler for superconducting magnet

A cold mass for a superconducting magnet system in one example comprises a superconducting magnet, a cryogenic cooling circuit, and a magnet and cooling circuit support. The magnet and cooling circuit support comprises a substantially conductive coupler that serves to couple the superconducting magnet and the cryogenic cooling circuit. The cryogenic cooling circuit comprises an inlet path and a substantially upward outlet path. The inlet path avoids direct conductive thermal engagement with the substantially conductive coupler. The substantially upward outlet path comprises direct conductive thermal engagement with the substantially conductive coupler.

Permanent magnet assembly and method of making thereof

An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.

Superconductive magnet including a cryocooler coldhead

A magnet, such as an open or closed magnet, has a first assembly with at least one superconductive main coil and with a first vacuum enclosure enclosing the main coil(s). A first cryocooler coldhead has a rigid first housing and is generally vertically aligned. A first flexible bellows is vertically aligned, has a first end attached to the first housing of the first cryocooler coldhead and has a second end attached to the first vacuum enclosure of the first assembly.

Superconductive magnet including a cryocooler coldhead

A magnet, such as an open or closed magnet, has a first assembly with at least one superconductive main coil and with a first vacuum enclosure enclosing the main coil(s). A first cryocooler coldhead has a rigid first housing and is generally vertically aligned. A first flexible bellows is vertically aligned, has a first end attached to the first housing of the first cryocooler coldhead and has a second end attached to the first vacuum enclosure of the first assembly.

Methods for making low resistivity joints

Method for joining wires using low resistivity joints is provided. More specifically, methods of joining one or more wires having superconductive filaments, such as magnesium diboride filaments, are provided. The wires are joined by a low resistivity joint to form wires of a desired length for applications, such in medical imaging applications.

Apparatus and method for producing a compression molded product

A compression molding apparatus includes a mold of a first material having a first coefficient of thermal expansion and a plug of a second material having a second coefficient of thermal expansion different from the first coefficient of thermal expansion. The mold has a cavity into which the plug is placed such that the mold and plug are disposed relative to one another providing a gap therebetween having a first volume for holding a body that at least partially fills the gap when the mold and plug are at a first temperature and for molding the body into a molded product when the mold and plug are subjected to a second temperature that causes one of the first and second materials of the mold and plug to change in size more than the other and thereby change the gap to a second volume different from the first volume and compress the body.

Low eddy current cryogen circuit for superconducting magnets

A low eddy current cryogen circuit for superconducting magnets including at least a first cooling coil made of an electrically conducting material and having at least one electrical isolator incorporated in the first cooling coil. The electrical isolator is located to inhibit induced eddy current loops due to inductive coupling of the first cooling coil with eddy current inducing field sources.

Permanent magnet assembly and method of making thereof

An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.

Permanent magnet assembly and method of making thereof

An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.

LOW EDDY CURRENT CRYOGEN CIRCUIT FOR SUPERCONDUCTING MAGNETS

A low eddy current cryogen circuit for superconducting magnets including at least a first cooling coil made of an electrically conducting material and having at least one electrical isolator incorporated in the first cooling coil. The electrical isolator is located to inhibit induced eddy current loops due to inductive coupling of the first cooling coil with eddy current inducing field sources.

METHODS FOR MAKING LOW RESISTIVITY JOINTS

Method for joining wires using low resistivity joints is provided. More specifically, methods of joining one or more wires having superconductive filaments, such as magnesium diboride filaments, are provided. The wires are joined by a low resistivity joint to form wires of a desired length for applications, such in medical imaging applications. 1. A method of joining wires , the method comprising:introducing a magnesium diboride joint material to an end of a first wire and an end of a second wire at a joint area, wherein at least one of the first and second wires comprises superconductive magnesium diboride filaments; andaffecting the joint area such that the end of the first wire and the end of the second wire are electrically and mechanically coupled through the joint material.2. The method claim 1 , as set forth in claim 1 , wherein each of the first and second wires comprises superconductive magnesium diboride filaments.3. The method claim 1 , as set forth in claim 1 , wherein the first wire comprises magnesium diboride filaments and the second wire comprises filaments that do not comprise magnesium diboride.4. The method claim 3 , as set forth in claim 3 , wherein the filaments of the second wire are superconductive.5. The method claim 1 , as set forth in claim 1 , wherein affecting the joint area comprises at least one of a mechanical process claim 1 , a thermal process claim 1 , a chemical process claim 1 , or combinations thereof.6. The method claim 1 , as set forth in claim 1 , wherein affecting the joint area comprises deforming the joint area to densify the filaments of each of the first and second wires and the magnesium diboride joint material.7. The method claim 1 , as set forth in claim 1 , wherein affecting the joint area comprises heating the joint area to sinter the filaments of each of the first and second wires and the magnesium diboride joint material.8. The method claim 1 , as set forth in claim 1 , wherein affecting the joint area comprises at ...

Method and apparatus for magnetizing a permanent magnet

A magnetizing coil unit and a method of making a magnetizing coil unit is provided. The coil includes a solenoid coil having a coiled copper sheet in which the width of the copper sheet is equal to the height of the solenoid coil. A magnetizing assembly includes a plurality of magnetizing coil units.

Method and apparatus for magnetizing a permanent magnet

A magnetizing coil unit and a method of making a magnetizing coil unit is provided. The coil includes a solenoid coil having a coiled copper sheet in which the width of the copper sheet is equal to the height of the solenoid coil. A magnetizing assembly includes a plurality of magnetizing coil units.

Cold mass with discrete path substantially conductive coupler for superconducting magnet and cryogenic cooling circuit

A cold mass for a superconducting magnet system in one example comprises a superconducting magnet, a cryogenic cooling circuit, and a magnet and cooling circuit support. The magnet and cooling circuit support comprises a substantially conductive coupler in a discrete path that serves to couple the superconducting magnet and the cryogenic cooling circuit.

Low noise MRI scanner

A low noise imaging apparatus for producing Magnetic Resonance (MR) images of a subject and for substantially minimizing acoustic noise generated during imaging is provided. The imaging apparatus comprises a magnet assembly, a gradient coil assembly, and a rf coil assembly, wherein at least one of the magnet assembly, the gradient coil assembly and the rf coil assembly are configured to reduce the generation and transmission of acoustic noise.

Low eddy current cryogen circuit for superconducting magnets

A low eddy current cryogen circuit for superconducting magnets including at least a first cooling coil made of an electrically conducting material and having at least one electrical isolator incorporated in the first cooling coil. The electrical isolator is located to inhibit induced eddy current loops due to inductive coupling of the first cooling coil with eddy current inducing field sources.

Permanent magnet assembly and method of making thereof

An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.

Multiple ring polefaceless permanent magnet and method of making

A permanent magnet assembly for an imaging apparatus having a permanent magnet body having a first surface and a stepped second surface which is adapted to face an imaging volume of the imaging apparatus, wherein the stepped second surface contains at least four steps.

Low resistivity joints for joining wires and methods for making the same

Method for joining wires using low resistivity joints is provided. More specifically, methods of joining one or more wires having superconductive filaments, such as magnesium diboride filaments, are provided. The wires are joined by a low resistivity joint to form wires of a desired length for applications, such in medical imaging applications.

COOLING SYSTEM AND METHOD FOR COOLING SUPERCONDUCTING MAGNET DEVICES

A cooling system and method for cooling superconducting magnet coils are provided. One magnet system for a superconducting magnet device includes a cooling system having at least one coil support shell, a plurality of superconducting magnet coils supported by the at least one coil support shell and a plurality of cooling tubes thermally coupled to the at least one coil support shell. The magnet system also includes a cryorefrigerator system fluidly coupled with the plurality of cooling tubes forming a closed circulation cooling system. 1. A magnet system for a superconducting magnet device , the magnet system comprising:at least one coil support shell;a plurality of superconducting magnet coils supported by the at least one coil support shell;a plurality of cooling tubes thermally coupled to the at least one coil support shell; anda cryorefrigerator system fluidly coupled with the plurality of cooling tubes forming a closed circulation cooling system.2. The magnet system of claim 1 , wherein the cryorefrigerator system comprises a non-venting system.3. The magnet system of claim 1 , wherein the cryorefrigerator system comprises a vent having a venting pressure higher than a normal boil-off venting level.4. The magnet system of claim 1 , wherein the cryorefrigerator system comprises at least one Helium gas tank.5. The magnet system of claim 4 , wherein the Helium gas tank stores less than about 300 liters of Helium gas at about 30 atmosphere (atm).6. The magnet system of claim 4 , wherein the Helium gas tank is toroidal shaped and surrounds the at least one coil support shell.7. The magnet system of claim 1 , wherein the cryorefrigerator system comprises at least one liquid Helium tank.8. The magnet system of claim 7 , wherein the liquid Helium tank stores about 10 liters of liquid Helium.9. The magnet system of claim 7 , wherein the liquid Helium tank comprises a hermetically sealed inlet port.10. The magnet system of claim 1 , further comprising a thermal shield ...

RETRACTABLE CURRENT LEAD

A current lead assembly for minimizing heat load to a conduction cooled superconducting magnet during a ramp operation is provided. The current lead assembly includes a vacuum chamber having a through hole to enable a retractable current lead having a retractable contact to penetrate within the vacuum chamber. A superconducting magnet is arranged inside of the vacuum chamber and includes a magnet lead. A current contact is arranged inside of the vacuum chamber beneath the through-hole and is coupled to the magnet lead via a thermal connector. The current contact is supported by a thermal isolation support structure coupled to an inside wall of the vacuum chamber. An actuator assembly is provided to contact the retractable contact with the current contact, where connection occurs at ambient temperature inside of the thermal isolation support structure. 1. A current lead assembly for a superconducting magnet , comprising:a vacuum chamber having a through hole;a superconducting magnet arranged inside of the vacuum chamber and having a magnet lead;a current contact arranged inside of the vacuum chamber beneath the through-hole;a thermal connector having one end coupled to the magnet lead and another end coupled to the current contact;a thermal isolation support structure coupled to an inside wall of the vacuum chamber to support the current contact beneath the through-hole;a retractable current lead sealably penetrating the vacuum chamber via the through hole and having a retractable contact; andan actuator assembly, coupled to the vacuum chamber and the retractable current lead, arranged to contact the retractable contact with the current contact, wherein the contact occurs at ambient temperature inside of the thermal isolation support structure.2. The current lead assembly of claim 1 , wherein the actuator assembly is arranged to separate the retractable contact of the retractable current lead from the current contact upon completion of a magnet ramp operation.3. The ...

SYSTEMS AND METHODS FOR STORING AND DISTRIBUTING GASES

A system includes a storage tank storing gas. The storage tank includes a storage tank interface portion made from a first material. The system also includes a nozzle that includes a nozzle interface portion and a first portion. The first portion is made from a second material different from the first material. Additionally, the system includes a connection formed by coupling the storage tank interface portion and the nozzle interface portion to one another, and the connection is configured to maintain a leak rate of the gas equal to or less than 1×10standard cubic centimeters per second (std. cc/s). 1. A system comprising:a storage tank storing gas and comprising a storage tank interface portion made from a first material; anda nozzle comprising a nozzle interface portion and a first portion, wherein the first portion is made from a second material different from the first material; and{'sup': '−4', 'a connection formed by coupling the storage tank interface portion and the nozzle interface portion to one another, wherein the connection is configured to maintain a leak rate of the gas equal to or less than 1×10standard cubic centimeters per second (std. cc/s).'}2. The system of claim 1 , wherein the connection is a friction weld.3. The system of claim 1 , wherein the first material is aluminum claim 1 , and the second material is stainless steel.4. The system of claim 3 , wherein the nozzle interface portion is made from the first material.5. The system of claim 1 , wherein the storage tank is made from the first material and a third material claim 1 , wherein the third material comprises carbon fiber.6. The system of claim 1 , wherein the connection is configured to maintain the leak rate equal to or less than 1×10std. cc/s.7. The system of claim 1 , wherein the connection comprises a threaded connection.8. The system of claim 7 , comprising an epoxy disposed around and sealing the threaded connection.9. The system of claim 7 , comprising a gasket claim 7 , ...

SYSTEMS FOR PRODUCING PRECISION MAGNETIC COIL WINDINGS

A system for producing precision magnetic coil windings is provided. The system includes a wire disposing assembly having a support, an axial traverser sub-assembly, and a support arm. The support is configured to receive a plurality of turns of a wire. The axial traverser sub-assembly is operatively coupled to the support. The support arm includes a wire disposing device. The system further includes a linear stage, a monitoring unit, a feedback unit, and a controller unit. The linear stage is operatively coupled to the support arm. Moreover, the controller unit is configured to axially position an incoming portion of the wire and provide reference trajectories for tracking. 1. A system configured to produce precision magnetic coil windings , comprising: a support configured to receive a plurality of turns of a wire, wherein the support is configured to rotate;', 'an axial traverser sub-assembly operatively coupled to the support, wherein a rate of motion of the axial traverser sub-assembly is coupled to a speed of rotation of the support;', 'a support arm comprising a wire disposing device configured to guide a portion of the wire being disposed on a surface of the support;, 'a wire disposing assembly, comprisinga linear stage operatively coupled to the support arm;a monitoring unit; anda controller unit configured to axially position an incoming portion of the wire and provide reference trajectories for tracking.2. The system of claim 1 , wherein the monitoring unit comprises a feedback unit configured to provide a real-time feedback of a position of the wire on the support and a rotational position of the support.3. The system of claim 2 , and wherein the feedback unit comprises a stage encoder claim 2 , a wire position estimator claim 2 , a wire profiler claim 2 , or combinations thereof.4. The system of claim 2 , wherein the feedback unit comprises a spindle encoder configured to provide data representative of an angular position of a spindle.5. The system of ...

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 ...

Magnetic coil support in magnetic resonance imaging method and apparatus

An imaging device may include multiple magnetic coils to generate a magnetic field. Additionally, the imaging device may include an outer support affixed to at least one coil of the plurality of magnetic coils and an axial support between at least two coils of the plurality of magnetic coils, wherein the outer support and the axial support operatively share a load corresponding to the generated magnetic fields.

FORCE REDUCED MAGNETIC SHIM DRAWER

An MRI scanner can include a magnet assembly forming a central magnetic field area, and a slot for receiving a shim drawer formed within the central magnetic field area. There can be included a shim drawer received within the slot. The shim drawer can be configured to carry one or more metal shim and the shim drawer can be formed of conductive material. 1. An MRI scanner comprising:a magnet assembly forming a central magnetic field area;a slot for receiving a shim drawer, the slot formed within the central magnetic field area;a shim drawer received in the slot, wherein the shim drawer is configured to carry one or more metal shim, wherein the shim drawer includes conductive material.2. The MRI scanner of claim 1 , wherein the shim drawer is formed of aluminum.3. The MRI scanner of claim 1 , wherein the shim drawer includes an insulator coating for reducing or preventing metal to metal contact between the shim drawer and the one or more conductive shim.4. The MRI scanner of claim 1 , wherein the MRI scanner includes one or more conductive shims carried by the conductive shim drawer claim 1 , the one or more conductive shim is formed of iron.5. The MRI scanner of claim 1 , wherein the one or more conductive shim includes an insulator coating for reducing or preventing metal to metal contact between the shim drawer and the one or more conductive shim.6. The MRI scanner of claim 1 , including the shim drawer and a second shim drawer claim 1 , the second shim drawer including conductive material claim 1 , wherein the MRI scanner is configured so that the shim drawer and the second shim drawer are electrically connected.7. The MRI scanner of claim 1 , including the shim drawer and a second shim drawer claim 1 , the second shim drawer including conductive material claim 1 , wherein the MRI scanner is configured so that the shim drawer and the second shim drawer are electrically connected at first and second spaced apart locations to define a closed conductive current path ...

SYSTEMS AND METHODS FOR COOLING A SUPERCONDUCTING SWITCH USING DUAL COOLING PATHS

A persistent current switch system is presented. One embodiment of the persistent current switch system includes a vacuum chamber having a winding unit and dual cooling paths. The dual cooling paths are configured to circulate a coolant flow. The dual cooling paths are defined by a first cooling path and a second cooling path. The first cooling path includes a solid thermal component disposed in direct contact with the winding unit and the second cooling path includes a cooling tube disposed in direct contact with the winding unit and configured to circulate a coolant therein. The dual cooling paths cool the temperature of the winding unit below the threshold temperature to transition the persistent current switch system from the first mode to the second mode. A method of for cooling a winding unit in a persistent current switch system and a switching system including dual cooling paths are also disclosed. 1. A persistent current switch system comprising:a vacuum chamber;a winding unit disposed in the vacuum chamber and configured to switch the persistent current switch system from a first mode to a second mode when a temperature associated with the winding unit is below a threshold temperature;a first cooling path comprising a solid thermal component in direct contact with the winding unit and a second cooling path comprising a cooling tube disposed in direct contact with the winding unit and configured to circulate a coolant therein, the first cooling path and the second cooling path defining dual cooling paths to cool the temperature of the winding unit below the threshold temperature to transition the persistent current switch system from the first mode to the second mode.2. The persistent current switch system as claimed in claim 1 , further comprising a flow control component disposed to control a flow of the coolant in the cooling tube.3. The persistent current switch system as claimed in claim 2 , wherein the flow control component is a cryogenic valve.4. ...

INTEGRATED COOLING CIRCUIT FOR USE WITH A SUPERCONDUCTING MAGNET

The present disclosure relates to using an integrated cooling circuit to provide both forced-flow pre-cooling functionality and closed-loop thermosiphon cooling for persistent mode operation of a superconducting magnet. In one embodiment, the integrated cooling circuit shares a single set of cooling tubes for use with both the forced-flow pre-cooling circuit as well as the closed-loop operating-state cooling circuit. 1. A cryogenic cooling system , comprising:a superconducting magnet comprising a set of magnet coils disposed on a cylindrical coil support structure; and a recondensor configured to recondense cryogen from vapor to liquid;', 'a first line configured to allow cryogen to be added to the cooling system and connecting to the recondensor, wherein a first end of the first line is outside of a vacuum vessel;', 'a storage vessel in fluid communication with the recondensor and configured to hold cryogen;', 'a plurality of cooling tubes in fluid communication with the storage vessel and configured to cool the set of magnet coils during operation;', 'a return line configured to convey cryogen from the plurality of cooling tubes to the recondensor;', 'a second line in fluid communication with the return line, wherein a first end of the second line is outside of the vacuum vessel;', 'a mode selector valve provided on the return line;', 'a first valve provided on the first line; and', 'a second valve provided on the second line;, 'a cooling system configured to cool at least the set of magnet coils, the cooling system has an operational mode and a pre-cooling mode, wherein the cooling system compriseswherein in the pre-cooling mode the mode selector valve is closed, the first valve is open, and the second valve is open so that cryogen flows in through one of the first line or the second line, through the cooling tubes, the storage vessel, and the recondensor, and out through the other of the first line or the second line.2. The cryogenic cooling system of claim 1 , ...

Superconducting magnet with improved support structure

【課題】マグネットの安定性の改善を達成するような改良型の支持構造をもつ超伝導マグネットを提供すること。 【解決手段】少なくとも１つの超伝導コイルと、該超伝導コイルに結合された少なくとも１つの支持部材と、これら超伝導コイルと支持部材の間にある少なくとも１つのコンプライアント界面と、を含むような超伝導マグネットについて記載している。超伝導コイルは半径方向を規定している。超伝導コイルは、半径方向と実質的に直交した軸方向で超伝導コイルを支持している。コンプライアント界面は、超伝導マグネットが付勢されたときに半径方向に移動するように構成されている。 【選択図】図１

Systems and methods for storing and distributing gases

A system includes a storage tank storing gas. The storage tank includes a storage tank interface portion made from a first material. The system also includes a nozzle that includes a nozzle interface portion and a first portion. The first portion is made from a second material different from the first material. Additionally, the system includes a connection formed by coupling the storage tank interface portion and the nozzle interface portion to one another, and the connection is configured to maintain a leak rate of the gas equal to or less than 1×10−4 standard cubic centimeters per second (std. cc/s).

Cooling system and method for superconducting magnets

A method for cooling a superconducting magnet enclosed in a cryostat of a magnetic resonance imaging system comprises introducing a gas into a cooling path in the cryostat from an input portion outside the cryostat. A heat exchanger in the cooling path is cooled by a refrigerator outside the cryostat. The gas at the heat exchanger is cooled as a cold gas or is condensed at the heat exchanger into a liquid cryogen. The cold gas or liquid cryogen from the heat exchanger flows through at least a connection tube to a magnet cooling tube, which is in thermal contact with the superconducting magnet. Heat from the superconducting magnet is removed by warming the cold gas into warm gas or by the boiling the liquid cryogen into boiled-off gas. The warm gas or boiled-off gas is transmitted back to the heat exchanger to re-cool the warm gas or re-condense the boiled-off gas for further cooling the superconducting magnet to a superconducting temperature. The input portion is closed to make the cooling path as a closed-loop for maintaining the superconducting magnet below the superconducting temperature.

Low eddy current cryogen circuit for superconducting magnets

A low eddy current cryogen circuit for superconducting magnets including at least a first cooling coil (102) made of an electrically conducting material and having at least one electrical isolator (104) incorporated in the first cooling coil (102). The electrical isolator (104) is located to inhibit induced eddy current loops due to inductive coupling of the first cooling coil (102) with eddy current inducing field sources.

Systems and methods for cooling a superconducting switch using dual cooling paths

A persistent current switch system is presented. One embodiment of the persistent current switch system includes a vacuum chamber having a winding unit and dual cooling paths. The dual cooling paths are configured to circulate a coolant flow. The dual cooling paths are defined by a first cooling path and a second cooling path. The first cooling path includes a solid thermal component disposed in direct contact with the winding unit and the second cooling path includes a cooling tube disposed in direct contact with the winding unit and configured to circulate a coolant therein. The dual cooling paths cool the temperature of the winding unit below the threshold temperature to transition the persistent current switch system from the first mode to the second mode. A method of for cooling a winding unit in a persistent current switch system and a switching system including dual cooling paths are also disclosed.

A cryogenically cooled current lead assembly for a superconducting magnet and its method of use

A current lead assembly 14 and its cooling method, suitable for a superconducting magnet, comprises at least one current lead 16, 18 with at least one thermal device 30 coupled to a portion 24 of the lead 16, 18, where the said thermal device 30 includes a cryogen fluid flow path 32 extending through it and is arranged to cool the said portion 24 of the current lead. The cooled portion 24 of the current lead is the cold end portion of the lead, which, in use, may be electrically connected to a conductive winding 124, 126 of a superconducting magnet. The thermal device 30 may be made of metal or a metal alloy such as copper, aluminium, silver or brass and it may be an integral portion of a current lead 16, 18. Both positive and negative current leads 16, 18 may be involved with the cooling system. The cooling system may avoid the use of an electrical insulating material between the cooling device 30 and the current leads 16, 18 by either providing separate cooling systems for each of the leads 16, 18 or by providing electrical insulation 48 between portions of the cooling system. Electrical isolation tube portions 48 may be used in the cooling system. The cryogenic fluid may be a liquid/gas and the cooling system may include a cryogenic liquid container 42 and/or a boiled-off gas re-condenser.

Low resistivity joints for joining superconducting wires

A low resistivity joint is made between two wires 116, 118, or 152, 154 having superconductive filaments 126, 156, at least one having magnesium diboride filaments. A joint material 168, also including magnesium diboride is used. The filaments may be exposed before joining, and may be welded together, heated and/or compressed. The wires can be used in medical imaging applications.

Superconducting magnet assembly and fabricating method

Cooling system and method for cooling superconducting magnet devices

Cryogenic system and method for superconducting magnets

Wind turbine having superconducting generator and method of operating the same

A wind turbine is presented. The wind turbine includes a rotor having a plurality of blades. The wind turbine further includes a shaft coupled to the rotor. Moreover, the wind turbine includes a superconducting generator coupled to the rotor via the shaft. The superconducting generator includes an armature configured to be rotated via the shaft. The superconducting generator further includes a stationary field disposed concentric to and radially outward from the armature.

Gerät der bildgebenden magnetischen Resonanz mit geringer Lärmemission

Pol für einen MRI-Magneten aus laminierten Teilen, ein Verfahren zur Herstellung des Pols und eine Form zum Verkleben der Teile des Pols

格納式電流リード

【課題】伝導冷却式超伝導マグネットにおいて良好な電気接続を確立しかつ熱負荷を最小限にする。 【解決手段】電流リードアセンブリ（１０）は、格納式接触子（１７）を有する格納式電流リード（１８）の真空チェンバ（１２）内部への貫通を可能にする貫通孔（２０）を有する真空チェンバ（１２）を含む。超伝導マグネット（１４）は、真空チェンバ（１２）の内部に配列され、マグネットリード（３４）を含む。真空チェンバ（１２）の内部で貫通孔（２０）の下側に電流接触子（３２）を配列させており、この電流接触子は熱コネクタ（３６）を介してマグネットリード（３４）に結合させている。電流接触子（３２）は真空チェンバ（１２）の内壁に結合させた断熱支持構造（３８）によって支持される。断熱支持構造（３８）の内部の外界温度で格納式接触子（１７）を電流接触子（３２）と接触させるためにアクチュエータアセンブリ（２６）を設けている。 【選択図】図１

Pol für einen MRI-Magneten aus laminierten Teilen, ein Verfahren zur Herstellung des Pols und eine Form zum Verkleben der Teile des Pols

超伝導マグネットのための冷媒システム及び方法

【課題】完全な閉鎖系で包含する冷媒体積が非常に小さい冷媒システムを提供すること。 【解決手段】超伝導マグネット向けの冷媒システムは閉ループ冷却経路を備える。閉ループ冷却経路は超伝導マグネットに熱的に結合させたマグネット冷却チューブを備える。マグネット冷却チューブは冷媒流通路を備える。閉ループ冷却チューブはさらに、チューブ区画を通じてマグネット冷却チューブに流体結合させた再凝縮器と、マグネット冷却チューブと再凝縮器の間に流体結合させた液体冷媒コンテナと、を備える。接続チューブを通じてマグネット冷却チューブに少なくとも１つの気体タンクを流体結合させている。 【選択図】図１