WO2017057760A1 - Dispositif d'aimant supraconducteur et accessoire d'excitation d'aimant supraconducteur - Google Patents

Dispositif d'aimant supraconducteur et accessoire d'excitation d'aimant supraconducteur Download PDF

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Publication number
WO2017057760A1
WO2017057760A1 PCT/JP2016/079173 JP2016079173W WO2017057760A1 WO 2017057760 A1 WO2017057760 A1 WO 2017057760A1 JP 2016079173 W JP2016079173 W JP 2016079173W WO 2017057760 A1 WO2017057760 A1 WO 2017057760A1
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Prior art keywords
lead
excitation
superconducting coil
superconducting
superconducting magnet
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PCT/JP2016/079173
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English (en)
Japanese (ja)
Inventor
武夫 根本
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株式会社日立製作所
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Priority to JP2017543663A priority Critical patent/JP6488020B2/ja
Publication of WO2017057760A1 publication Critical patent/WO2017057760A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/04—Cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/30—Devices switchable between superconducting and normal states
    • H10N60/35—Cryotrons
    • H10N60/355—Power cryotrons
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/80—Constructional details
    • H10N60/81—Containers; Mountings

Definitions

  • the present invention relates to a superconducting magnet device and a superconducting magnet excitation tool.
  • a superconducting magnet device that generates a magnetic field by a superconducting phenomenon is used in a magnetic resonance imaging (MRI) device, a nuclear magnetic resonance (NMR) device, or the like.
  • MRI magnetic resonance imaging
  • NMR nuclear magnetic resonance
  • a superconductor wire such as niobium titanium (NbTi) or niobium tritin (Nb 3 Sn) is used.
  • high-temperature superconductors such as magnesium diboride (MgB 2 ), BSCCO, and YBCO (Y123) have been put into practical use.
  • excitation of a superconducting coil is performed by supplying an excitation current having a required current value from a power source through an excitation lead. After the excitation, the superconducting coil is disconnected from the power source, and the operation in the permanent current mode is continued. In the permanent current mode, a current continues to flow through a closed circuit superconducting coil without resistance, and a required magnetic field is generated. Thereafter, when the superconducting coil is demagnetized, the circuit loop is switched again.
  • a permanent current switch that is an element using a superconductor.
  • the thermal permanent current switch is configured such that a superconductor formed as a non-inductive winding can be heated by a resistance wire heater or the like. When the superconducting wire in the superconducting state below the transition temperature (critical temperature) is heated to a temperature exceeding the transition temperature, the switch is turned off.
  • the permanent current switch When exciting the superconducting coil in the superconducting magnet device, the permanent current switch is heated to a temperature exceeding the transition temperature, and the switch is turned off. Therefore, the superconducting coil that should be kept below the transition temperature is exposed to a heat load from the heated permanent current switch. Further, the superconducting coil is in a state of being thermally connected to a power source placed at room temperature via an excitation lead. Moreover, since the exciting current fed from the power source through the exciting lead is a large current, a Joule heat having a heat quantity that cannot be neglected can be transferred to the superconducting coil. Such a heat load gives a large cooling load to the refrigerator that cools the superconducting coil.
  • Patent Document 1 includes a superconducting coil, a permanent current switch, a first cryogenic refrigerator that cools the superconducting coil, another second cryogenic refrigerator that cools the permanent current switch, and a vacuum vessel.
  • a refrigerator-cooled superconducting magnet device is disclosed.
  • Patent Document 2 discloses a technique in which a detachable current lead portion is configured by a fixed connector, a movable connector, and an intermediate movable connector.
  • JP 2010-283186 A Japanese Unexamined Patent Publication No. 4-034905
  • the thermal connection between the superconducting coil and the power source can be disconnected during the operation in the permanent current mode.
  • the excitation lead when exciting the superconducting coil, the excitation lead must be thermally connected to a power source or the like. Therefore, it is still unavoidable that the cooling load of the superconducting coil refrigerator increases due to the intrusion heat entering through the excitation lead.
  • an object of the present invention is to provide a superconducting magnet device and a superconducting magnet excitation tool capable of suppressing heat transfer to the superconducting coil via the exciting lead and reducing the cooling load for the superconducting coil.
  • a superconducting magnet device includes a superconducting coil, a permanent current switch for switching between opening and closing of a circuit incorporating the superconducting coil, and a vacuum vessel containing the superconducting coil and the permanent current switch.
  • One end is connected to the superconducting coil and the other end is drawn to the outside of the vacuum container, the lead for the superconducting coil capable of supplying an exciting current to the superconducting coil, and the outside of the vacuum container.
  • a power supply for supplying an exciting current to the superconducting coil on the opposite side to the inner terminal connectable to the other end of the lead for the superconducting coil A movable connector portion that has an outer terminal connectable with an excitation lead to be connected, and moves forward and backward between a state in which the inner terminal and the outer terminal are connected and a state in which the outer terminal is not connected with expansion and contraction of the bellows;
  • the outer surface of the vacuum vessel provided with the movable connector portion supports the excitation lead and a lead refrigerator thermally connected to the excitation lead, and the outer surface of the vacuum vessel And a cover body capable of holding the exciting lead in an airtight state.
  • the superconducting magnet excitation tool includes an excitation lead connected to a power source for supplying an excitation current to the superconducting coil, a lead refrigerator thermally connected to the excitation lead, A support body that supports the excitation lead and the lead refrigerator, and is in close contact with the outer surface of the superconducting magnet device including the superconducting coil, and is capable of holding the excitation lead in an airtight state.
  • the present invention it is possible to provide a superconducting magnet device and a superconducting magnet excitation tool capable of suppressing heat transfer to the superconducting coil via the exciting lead and reducing the cooling load for the superconducting coil.
  • FIG. 1 is a cross-sectional view of the superconducting magnet device according to the first embodiment of the present invention.
  • a superconducting magnet device 100 includes a superconducting coil 1, a high heat conducting member 2, a permanent current switch 3, a terminal plate 3a, a superconducting coil refrigerator 4, a heat shield 5 and a laminated layer.
  • FIG. 1 shows a superconducting magnet apparatus 100 in a state where a superconducting magnet excitation tool 200 for exciting the superconducting coil 1 is attached to the outer surface of a vacuum vessel 7 provided with a movable connector plate 18.
  • the superconducting magnet device 100 is a conduction cooling type superconducting magnet device using a refrigerator.
  • the superconducting coil 1 has a structure in which a superconducting wire made of a superconductor is wound around a bobbin.
  • Superconductors such as niobium titanium (NbTi) exhibiting a transition temperature below the boiling point of nitrogen, magnesium diboride (MgB 2 ), BSCCO, YBCO (Y123), etc. exhibiting a transition temperature higher than the boiling point of nitrogen, etc. Any of the high temperature superconductors can be applied.
  • an insulating layer is provided between the superconducting wire and the bobbin or between the superconducting wires to be electrically insulated from each other.
  • the high thermal conductive member 2 is thermally connected to the superconducting coil 1.
  • the high thermal conductive member 2 supports the permanent current switch 3 and the terminal plate 3a of the permanent current switch 3 together with the superconducting coil 1, and is also thermally connected to the permanent current switch 3 and the terminal plate 3a.
  • the high thermal conductive member 2 is formed of aluminum, copper, an alloy thereof, or the like having high thermal conductivity.
  • being thermally connected mainly means a state in which heat can be transferred through heat conduction in a solid phase or heat transfer between solid phases in contact with each other.
  • having high thermal conductivity means that the thermal conductivity at a temperature of 4K is 200 W / (m ⁇ K) or more.
  • the superconducting coil refrigerator 4 is a two-stage type including a first stage 4a and a second stage 4b.
  • a Gifford-McMahon (GM) refrigerator for example, a Stirling refrigerator, a pulse tube refrigerator, or the like can be used.
  • the cooling performance of the superconducting coil refrigerator 4 is, for example, 60 W at a temperature of 60K and 1 W at a temperature of 4K.
  • the superconducting coil refrigerator 4 is thermally connected to the superconducting coil 1. Specifically, the second stage 4 b of the superconducting coil refrigerator 4 is in contact with the high heat conductive member 2. The superconducting coil refrigerator 4 can conduct and cool the superconducting coil 1, the permanent current switch 3, and the terminal plate 3 a that are thermally connected to the high heat conducting member 2.
  • the permanent current switch 3 is an element that switches between opening and closing of a circuit in which the superconducting coil 1 is incorporated.
  • the permanent current switch 3 is, for example, a thermal permanent current switch in which a non-dielectrically wound superconducting wire is wound together with a resistance wire as a heater.
  • the superconducting wire of the permanent current switch 3 is connected to the superconducting wire drawn out from the superconducting coil 1, and a resistance wire (not shown) is drawn out to the terminal plate 3a.
  • the superconducting coil 1, the high heat conductive member 2, the permanent current switch 3, and the terminal plate 3a are covered over the entire surface by a laminated heat insulating material 6 in which a heat shield 5 is laminated on the inner surface side. Radiation heat directed from the outside toward the superconducting coil 1 and the like is shielded by the heat shield 5 and the laminated heat insulating material 6.
  • the heat shield 5 and the laminated heat insulating material 6 are thermally connected to the first stage 4 a of the superconducting coil refrigerator 4.
  • the heat shield 5 and the laminated heat insulating material 6 are conductively cooled by the superconducting coil refrigerator 4.
  • the vacuum vessel 7 accommodates the superconducting coil 1, the high heat conducting member 2, the permanent current switch 3, and the terminal plate 3a. Specifically, the laminated heat insulating material 6 covering the superconducting coil 1 and the like is accommodated inside separated from the inner surface of the vacuum vessel 7. The inside of the vacuum vessel 7 is in a high vacuum state, and the superconducting coil 1, the high heat conductive member 2, the permanent current switch 3, and the like are held in an adiabatic manner in the vacuum with few thermally connected portions. It is like that.
  • the superconducting coil lead 9 is connected to the superconducting coil 1 drawn to the permanent current switch 3, while the other end is drawn to the outside of the vacuum vessel 7.
  • the superconducting coil lead 9 is provided with a pair of electric wires on the input side and the output side. Hereinafter, these will be collectively described as the lead 9 for the superconducting coil.
  • the superconducting coil lead 9 is an electric wire that can be energized with an exciting current to the superconducting coil 1 by being electrically connected to a power source.
  • the superconducting coil 1 and the permanent current switch 3 are connected to the power supply in a parallel relationship on the circuit.
  • the permanent current switch lead 10 is an electric wire that can be energized with an operating current for the permanent current switch 3, that is, a current to the resistance wire, by being electrically connected to a power source.
  • the superconducting coil lead 9 and the permanent current switch lead 10 may be formed of a normal conductor such as copper or copper alloy having high thermal conductivity, or may be formed of a superconductor or a high-temperature superconductor. If the winding of the superconducting coil 1 is a high-temperature superconductor, the operating temperature of the superconducting coil 1 can be set to 15K or higher. For example, if the transition temperature is YBCO having a temperature of 90K or higher, the operating temperature of the superconducting coil 1 can be set to a temperature of 70K or higher. Usually, the refrigerating capacity of the refrigerator is proportional to the temperature of the object to be cooled.
  • the superconducting coil lead 9 and the permanent current switch lead 10, particularly the superconducting coil lead 9 with a high-temperature superconductor from the viewpoint of stably energizing by increasing the refrigerating capacity of the refrigerator. .
  • the current density at the design allowable current is 16 A / mm 2 at a temperature of about 4 K, and the thermal conductivity is 250 W / (m ⁇ K).
  • the current density at the design allowable current is 200 A / mm 2 and the thermal conductivity is 0.12 W / (m ⁇ K) at a temperature of about 4K. It becomes. That is, good conduction is realized by replacing the superconducting coil lead 9 and the permanent current switch lead 10 from a normal conductor to a superconductor.
  • a superconducting magnet excitation tool 200 for exciting the superconducting coil 1 is attached to the outer surface of the vacuum vessel 7 provided in the superconducting magnet device 100.
  • the superconducting magnet device 100 has a fixed connector plate 14, a fixed bellows 16, and a movable connector plate 18 at the mounting position of the superconducting magnet excitation tool 200.
  • FIG. 2 is an enlarged sectional view showing the superconducting magnet excitation tool according to the first embodiment of the present invention.
  • the fixed connector plate 14 hermetically closes a through hole 7c provided in the wall portion of the vacuum vessel 7, and is fixed to the wall portion of the vacuum vessel 7 from the inside by a screw 14b. Yes.
  • Each of the other end of the superconducting coil lead 9 and the other end of the permanent current switch lead 10 passes through the fixed connector plate 14 and is drawn to the outside of the vacuum vessel 7, and is outside the fixed connector plate 14. It is aggregated so that terminal connection is possible.
  • the fixed bellows 16 stands on the outer surface of the vacuum vessel 7 so as to surround the other end of the superconducting coil lead 9 drawn out of the vacuum vessel 7 and the other end of the permanent current switch lead 10. It is installed.
  • the fixed bellows 16 has a tubular shape that can be expanded and contracted, and has airtightness in the tubular portion.
  • the fixed bellows 16 is made of stainless steel or the like.
  • the movable connector plate 18 airtightly covers the opening on the distal end side of the cylindrical fixed bellows 16.
  • the movable connector plate 18 is fixed to the distal end side of the fixed bellows 16 and is movable in a direction perpendicular to the fixed connector plate 14 as the fixed bellows 16 expands and contracts.
  • a superconducting coil lead adapter 19 and a permanent current switch lead adapter 20 are fixed to the movable connector plate 18.
  • the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20 are provided with a pair of adapters on the input side and the output side, which will be described below collectively.
  • the superconducting coil lead adapter 19 has an inner terminal 19 a that can be connected to the other end of the superconducting coil lead 9 on the inner side facing the outer surface of the vacuum vessel 7, that is, the inner side facing the fixed connector plate 14.
  • an outer terminal 19b that can be connected to the excitation lead 29 is provided on the opposite outer side.
  • the permanent current switch lead adapter 20 has an inner terminal 20 a that can be connected to the other end of the permanent current switch lead 10 on the inner side facing the outer surface of the vacuum vessel 7.
  • an outer terminal 20b that can be connected to the energization lead 30 is provided on the opposite side.
  • the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20 may be formed of a normal conductor such as copper or copper alloy having high thermal conductivity, or may be formed of a superconductor or a high-temperature superconductor. Good.
  • the movable connector plate 18 advances and retracts in the direction perpendicular to the fixed connector plate 14 with the expansion and contraction of the fixed bellows 16, and is connected to the leads of the inner terminals (19a, 20a) and the outer terminals (19b, 20b). It is possible to switch between a connection state where each terminal is connected and a non-connection state where each terminal is disconnected.
  • the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20 are electrically connected between the inner terminals (19a, 20a) and the outer terminals (19b, 20b). In this case, the exciting lead 29 and the superconducting coil lead 9 and the energizing lead 30 and the permanent current switch lead 10 are electrically connected in both input and output directions.
  • the movable connector plate 14 is formed of an insulating material. Alternatively, it is made of an appropriate material, and the contact surface with which each lead comes into contact is insulated by an insulating tape, an insulating washer or the like.
  • the superconducting magnet excitation tool 200 includes a cover body 25, an excitation lead 29, an energization lead 30, and a lead refrigerator 34.
  • the superconducting magnet excitation tool 200 is mounted on the outer surface of the vacuum vessel 7 provided with the movable connector plate 18 via the cover body 25.
  • the cover body 25 is a box-shaped cover having an opening.
  • the opening end of the cover body 25 extends in a bowl shape to the side to form a flange portion (fixed portion) 25a.
  • the flange portion 25 a is provided with a screw hole 25 b, and the cover body 25 is arranged so that the screw hole 25 b is flush with the screw hole 7 b provided on the outer surface of the vacuum vessel 7.
  • the flange portion 25a of the cover body 25 is detachably fixed to the vacuum container 7 by a screw 26 that is screwed into the screw hole 25b and the screw hole 7a.
  • the cover body 25 supports the excitation lead 29, the energization lead 30 and the lead refrigerator 34 on the outer surface of the vacuum vessel 7.
  • An O-ring (not shown) is interposed on the surface on the opening end side of the flange portion 25a of the cover body 25.
  • the cover body 25 is in close contact with the outer surface of the superconducting magnet device 100, that is, the outer surface of the vacuum vessel 7 via an O-ring, and the leading end side of the exciting lead 29, the leading end side of the energizing lead 30, the movable connector plate 18, the superconducting coil.
  • the lead adapter 19 for a permanent current, the lead adapter 20 for a permanent current switch, etc. can be kept airtight.
  • the cover body 25 has an exhaust hole 25c for evacuating the wall portion.
  • a main valve (V1) (not shown) to which a hose (H) of a vacuum pump can be connected and a break valve (V2) are connected to the exhaust hole 25c (see FIG. 3).
  • the inside of the cover body 25 is evacuated by a vacuum pump when exciting the superconducting coil 1.
  • an unillustrated vacuum gauge or compound gauge may be installed in the exhaust hole 25c or the main valve (V1).
  • a Pirani vacuum gauge or an ion vacuum gauge is preferable.
  • the cover body 25 has a through hole 25d at the top.
  • a base end side bellows 36 is erected on the outer surface of the top portion of the cover body 25 so as to surround the through hole 25d.
  • the proximal end bellows 36 has a tubular shape that can be expanded and contracted, and has airtightness in the tubular portion, and is formed of, for example, stainless steel.
  • the opening outside the base end side bellows 36 is airtightly covered by a base end side flange plate (movable fixed portion) 38.
  • a plurality of screw shafts 40 are suspended from the outer surface of the top portion of the cover body 25 around the base end side bellows 36.
  • the distal end side of the screw shaft 40 is loosely inserted into a through hole provided in the proximal end flange plate 38 and is fastened and fixed by a nut 41 that is screwed into the screw shaft 40.
  • the proximal end flange plate 38 is movably provided along the screw shaft 40, and the height from the top of the cover body 25 is increased by the expansion and contraction of the proximal end bellows 36 by adjusting the fixing position by the nut 41. Can be changed.
  • Each of the pair of input / output excitation leads 29 and each of the pair of input / output energization leads 30 are fixed to the base end side flange plate 38.
  • the exciting lead 29 and the energizing lead 30 penetrate the proximal end flange plate 38 and are fixed to the proximal end flange plate 38 on the respective proximal ends connected to the power source. Further, the excitation lead 29 and the energization lead 30 penetrate the intermediate flange plate 42 and the distal end side flange plate 43, and the distal end side flange plate 43, the proximal end side flange plate 38 and the distal end side are disposed at the respective distal end sides.
  • the intermediate flange plate 42 is fixed at an intermediate position between the flange plate 43 and the flange plate 43.
  • a plurality of support shafts 44 hang from the inner surface of the top of the cover body 25.
  • the base end side of the support shaft 44 is fixed to the inner surface of the top portion in the vicinity of the through hole 25d.
  • the distal end side of the support shaft 44 is screwed into a screw groove of the flange-shaped flange member 45.
  • the flange member 45 is fixed to the opening end of the front end side bellows 46 erected on the front end side flange plate 43.
  • the material of the support shaft 44 is preferably glass fiber reinforced plastic (glass FRP (Fiber Reinforced Plastics)) or carbon fiber reinforced plastic (carbon FRP). This is because it has a low thermal conductivity as compared with a metal material having excellent mechanical strength.
  • the center of the tip side flange plate 43 is substantially fixed by a support shaft 44.
  • the exciting lead 29 and the energizing lead 30 fixed to the proximal end flange plate 38 have their respective distal ends installed on the movable connector plate 18 for the superconducting coil lead adapter 19 and the permanent current switch.
  • the lead adapter 20 is accurately positioned at a predetermined position facing the outer terminals (19b, 20b).
  • the proximal flange plate 38 is made of an insulating material.
  • the contact surface that is formed of an appropriate material and through which the exciting lead 29 or the energizing lead 30 penetrates and contacts is insulated by an insulating tape, an insulating washer, or the like.
  • the intermediate flange plate 42 and the front end side flange plate 43 are formed of a material having high thermal conductivity as well as insulation.
  • the contact surface is formed of a material having conductivity and high thermal conductivity, and the contact surface through which the exciting lead 29 and the energizing lead 30 are in contact is insulated by an insulating tape, an insulating washer, or the like. Examples of the material having high thermal conductivity as well as insulation include aluminum nitride and silicon carbide.
  • the exciting lead 29 is a rod such as a bus bar having conductivity.
  • the pair of input / output excitation leads 29 are formed by joining a low-temperature side lead 29a and a high-temperature side lead 29b in the longitudinal direction.
  • the material of the high temperature side lead 29b is preferably copper or a copper alloy in that it has excellent conductivity.
  • the material of the low temperature side lead 29a may be a normal conductor such as copper or copper alloy, but is preferably a superconductor, more preferably a high temperature superconductor.
  • the tip of the low temperature side lead 29a is preferably subjected to gold vapor deposition or gold plating from the viewpoint of reducing contact resistance.
  • the low temperature side lead 29a is formed of a high temperature superconductor having a transition temperature of about 90K or higher, the electrical resistance is substantially eliminated. That is, even when an excitation current of about 500 A is applied, heat generation can be substantially prevented.
  • the intrusion heat transmitted through the excitation lead 29 is normally expected to be about 0.2 W, but it is weak and does not cause a problem.
  • the pair of input / output excitation leads 29 are electrically connected to input / output terminals of an excitation current power source (not shown) on the base end side protruding from the base end side flange plate 38 to the outside of the cover body 25.
  • the exciting current power source is a power source for supplying an exciting current having a required current value to the superconducting coil 1.
  • the input / output pair of energization leads 30 are electrically connected to input / output terminals of an operating current power source (not shown) on the base end side protruding from the base end side flange plate 38 to the outside of the cover body 25.
  • the operating current power source is a power source for supplying an operating current to the permanent current switch 3, that is, for energizing a resistance wire as a heater.
  • the lead refrigerator 34 is a two-stage type including a first stage 34a and a second stage 34b.
  • a refrigerating machine 34 for example, a Gifford-McMahon (GM) refrigerator, a Stirling refrigerator, a pulse tube refrigerator, or the like can be used.
  • the cooling performance of the lead refrigerator 34 is, for example, that the lowest temperature reached by the second stage 34b reaches a temperature of 5K.
  • the lead refrigerator 34 is thermally connected to an input / output pair of excitation leads 29 and an input / output pair of energization leads 30.
  • the second stage 34 b of the refrigerating machine 34 is in contact with the plate-like first heat conducting member 51.
  • the second heat conducting member 52 having flexibility and high thermal conductivity connected to the first heat conducting member 51 and the front end side flange plate 43 connected to the second heat conducting member 52 are provided upright.
  • the front end side flange plate 43 is thermally connected to the third heat conducting member 53.
  • the first stage 34 a of the lead refrigerator 34 is in contact with the annular fourth heat conducting member 54. And it is thermally connected to the intermediate flange plate 42 through a fifth heat conducting member 55 having flexibility and high thermal conductivity coupled to the fourth heat conducting member 54.
  • the first heat conducting member 51, the third heat conducting member 53, and the fourth heat conducting member 54 are, for example, high heat conductors such as copper and copper alloys having high heat conductivity, such as a plate shape, a cylindrical shape, and an annular shape. It is formed in a predetermined shape.
  • the second heat conductive member 52 and the fifth heat conductive member 55 are formed in a flexible state by forming a thin wire of a high heat conductor such as copper or copper alloy having high heat conductivity into a net shape or the like. ing. That is, the lead refrigerator 34 is connected to the excitation lead 23 via the flexible second heat conductive member 52 and fifth heat conductive member 55.
  • the excitation lead 23 and the energization lead 28 are fixed integrally with the distal end side flange plate 22, the intermediate flange plate 19, and the proximal end side flange plate 24 while being conductively cooled by the lead refrigerator 34.
  • the height from the connector plate 14 can be changed.
  • FIG. 3 shows a state in which a superconducting magnet excitation tool is mounted on the superconducting magnet device
  • FIG. 4 shows a state in which each lead is connected
  • FIG. 5 shows a state in which the superconducting magnet excitation tool is removed from the superconducting magnet device.
  • 3, 4, and 5 sequentially show operations and operations in the method of using the superconducting magnet excitation tool.
  • illustration of the power source and the vacuum pump is omitted.
  • a superconducting magnet excitation tool 200 is mounted on the outer surface of the vacuum vessel 7 provided with the movable connector plate 18. That is, the cover body 25 and the vacuum vessel 7 of the superconducting magnet excitation tool 200 are fixed in close contact with a predetermined mounting position so that the inside of the cover body 25 is airtight. At this time, the base end side flange plate 38 protrudes with a height outside the cover body 25, that is, the distal end portion of the excitation lead 29 and the distal end portion of the energization lead 30 are the top portion of the cover body 25. Keep it in a closed position. In addition, the superconducting coil 1, the permanent current switch 3, and the like included in the superconducting magnet device 100 are sufficiently cooled below the transition temperature.
  • the hose H of the vacuum pump is connected to the main valve V1 installed in the exhaust valve 25c of the cover body 25, and the inside of the cover body 25 is evacuated by the vacuum pump.
  • the degree of vacuum inside the cover body 25 is preferably 10 Pa or less.
  • the refrigerating machine 34 is operated.
  • the first stage 34a and the second stage 34b of the refrigerating machine 34 are cooled to a sufficiently low temperature that is preferably lower than the transition temperature of the excitation lead 29, the superconducting coil lead 9 and the like, and excitation inside the cover body 25 is performed.
  • the lead 29 for electricity and the lead 30 for electricity supply are cooled.
  • the proximal end flange plate 38 fixing the exciting lead 29 and the energizing lead 30 is pushed in, and the proximal end flange plate 38 is moved to the cover body 25 side.
  • the proximal flange plate 38 is pushed in, first, the leading end of the excitation lead 29 and the leading end of the energization lead 30 are fixed to the movable connector plate 18 and the superconducting coil lead adapter 19 and the permanent lead, respectively.
  • the current switch lead adapter 20 is connected to each outer terminal (19b, 20b).
  • the proximal flange plate 38 when the proximal flange plate 38 is further pushed in, the movable connector plate 18 approaches the fixed connector plate 14 side with the compression of the fixed bellows 16. Then, the respective inner terminals (19a, 20a) of the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20 fixed to the opposite side of the movable connector plate 18 are superconducting drawn to the fixed connector plate 14. The other end of the coil lead 9 and the other end of the permanent current switch lead 10 are connected to each other.
  • the proximal end flange plate 38 is fastened to the screw shaft 40 by the nut 41 in a state where such a connection is made, and the height is fixed.
  • each of the input / output terminals of the excitation current power source is electrically connected to the base end side of the pair of input / output excitation leads 29, and the operating current power source is input to the base end side of the pair of input / output energization leads 30.
  • Each of the output terminals is electrically connected.
  • the permanent current switch 3 operates by supplying an operating current to a terminal plate 3a associated with the permanent current switch 3 by feeding from an operating current power source. For example, when a superconducting wire provided in the thermal permanent current switch 3 is heated to a resistance temperature or higher by energizing the resistance wire, an electrical resistance is generated and the permanent current switch 3 is turned off. When the permanent current switch 3 is turned off, the superconducting coil 1 is supplied with an exciting current having a necessary current value from an exciting current power source.
  • the permanent current switch 3 After the excitation current has been supplied, the permanent current switch 3 is switched to the ON state.
  • the permanent current switch 3 is switched by operating power supply from the operating current power source. For example, when the resistance heating of the superconducting wire provided in the thermal permanent current switch 3 is stopped by stopping the power supply from the operating current power supply, the permanent current switch 3 is turned on by conduction cooling by the superconducting coil refrigerator 4. It becomes a state.
  • the exciting current to the superconducting coil 1 is gradually reduced to stop power feeding.
  • the exciting current flowing through the superconducting coil 1 continues to flow cyclically through the permanent current switch 3 in the ON state, and the operation is in the permanent current mode.
  • the exciting current power source, the operating current power source, and the superconducting magnet excitation tool 200 can be removed from the superconducting magnet device 100.
  • the proximal end flange plate 38 to which the excitation lead 29 and the energization lead 30 are fixed is pulled out of the cover body 25.
  • the movable connector plate 18 is separated from the fixed connector plate 14 with the extension of the fixed bellows 16.
  • the inner terminals (19a, 20a) of the lead adapter 19 for the superconducting coil and the lead adapter 20 for the permanent current switch fixed to the movable connector plate 18 are the leads for the superconducting coil drawn out to the fixed connector plate 14, respectively. 9 and the other end of the permanent current switch lead 10 are pulled out from each other to be in a disconnected state.
  • the leading end portion of the exciting lead 29 and the leading end portion of the energizing lead 30 are the superconducting coil lead adapter 19 and the permanent current switch fixed to the movable connector plate 18, respectively.
  • the lead adapter 20 is disconnected from the outer terminals (19b, 20b) and is in a disconnected state. That is, each of the exciting lead 29 and the superconducting coil 1 and between the energizing lead 30 and the permanent current switch 3 are not in a thermally connected state. As a result, heat transfer from the outside to the superconducting coil 1 and the permanent current switch 3 through the exciting lead 29 and the energizing lead 30 is blocked.
  • the lead refrigerator 34 may be stopped after the proximal flange plate 38 is pulled out and the heat transfer to the superconducting coil 1 is interrupted. Further, the pulled-out proximal end side flange plate 38 may be fastened and fixed to the screw shaft 40 by the nut 41.
  • the terminals of the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20 are connected is confirmed based on the electrical resistance between the input and output of the exciting lead 29 and the energizing lead 30. It is possible. That is, if the electrical resistance is infinite, it can be confirmed that it is in a disconnected state. It is also possible to check based on temperature changes of the first stage 34a and the second stage 34b of the refrigerating machine 34. That is, if the temperature drop rate of the first stage 34a and the second stage 34b in the lead freezer 34 in operation is increased, it can be confirmed that the state is switched to the disconnected state. Further, the cover body 25 may be confirmed by providing a window portion through which the height of the movable connector plate 18 can be seen.
  • the break valve V2 (see FIG. 3) is opened, and the cover body is opened. Break the vacuum inside 25. Then, the superconducting magnet excitation tool 200 is removed by removing the screw 26 screwed into the cover body 25.
  • a protective cover 58 is attached as necessary.
  • the protective cover 58 may be fastened and fixed with the screw 26 at the same mounting position as the superconducting magnet excitation tool 200.
  • the energizing lead 30 and the permanent current switch 3 are connected between the exciting lead 29 and the superconducting coil 1 in the permanent current mode or the like. It is possible to leave the space not thermally connected. Therefore, heat transfer from the external room temperature space to the superconducting coil 1 and the permanent current switch 3 via the excitation lead 29 and the energization lead 30 can be satisfactorily suppressed. As a result, the heat load applied to the superconducting coil refrigerator 4 can be suppressed, and the cooling load associated with cooling the superconducting coil 1 to a predetermined temperature below the transition temperature can be reduced.
  • the superconducting magnet excitation tool 200 includes a lead refrigerator 34 that can cool the excitation lead 29 and the energization lead 30. Therefore, when connecting between the exciting lead 29 and the superconducting coil 1 and between the energizing lead 30 and the permanent current switch 3, the temperature gradient between them can be kept small. Further, by conducting cooling through the exciting lead 29, the energizing lead 30, the superconducting coil lead adapter 19 and the permanent current switch lead adapter 20, the superconducting coil lead 9, the permanent current switch lead 10, or The superconducting coil 1 and the permanent current switch 3 can be conductively cooled.
  • the superconducting magnet excitation tool 200 is detachable. Therefore, a single machine can be used for exciting a plurality of superconducting magnet devices 100, and the plurality of superconducting magnet devices 100 can be operated at low cost.
  • the refrigerating machine 34 is provided in the detachable superconducting magnet exciting tool 200, it is sufficient that the superconducting magnet apparatus 100 is provided with the superconducting coil refrigerator 4. Therefore, it is advantageous in that the manufacturing cost is also reduced.
  • the superconducting magnet device 100 can be operated, transported, traded, etc. with the superconducting magnet excitation tool 200 attached. That is, if the superconducting magnet device 100 is provided with the exciting lead 29, the energizing lead 30, the lead refrigerator 34, and the cover body 25, the base end side flange plate 38 is drawn and pushed. The action of blocking intrusion heat through the excitation lead 29 and the energization lead 30 can be obtained.
  • the superconducting magnet apparatus 100 can be suitably used for an MRI apparatus or the like.
  • the superconducting magnet device 100 can be operated in the permanent current mode in a state where heat penetration through the exciting lead 29 and the energizing lead 30 is reduced. Therefore, quenching is prevented, and it is useful in that an excellent MRI apparatus that does not include power supply noise in imaging can be realized.
  • FIG. 6 is a cross-sectional view showing an example of a superconducting magnet excitation tool according to the second embodiment of the present invention.
  • the superconducting magnet device 100A according to the second embodiment is provided with a fitting recess 18a and a guide portion 18b at the mounting position on the outer surface of the vacuum vessel 7.
  • the movable connector plate 18A is provided.
  • a superconducting magnet excitation tool 200A for exciting the superconducting coil 1 is attached to the outer surface of the vacuum vessel 7 provided in the superconducting magnet device 100A according to the second embodiment.
  • the lead refrigerator 34A is indirectly fixed to the excitation lead 29 and the energization lead 30, and the lead refrigerator 34A is the excitation lead 29 or It is provided integrally with the energization lead 30 so as to be able to advance and retreat.
  • the refrigerating machine 34A is fixed to the front end side flange plate 43A having a heat transfer connecting member (heat transfer portion) 60 provided so as to be thermally connectable to the movable connector plate 18A.
  • the superconducting magnet excitation tool 200A in the form shown in FIG. 6 includes a single-stage lead refrigerator 34A.
  • a movable connector plate 18 ⁇ / b> A to which a superconducting coil lead adapter 19 and a permanent current switch lead adapter 20 are fixed is provided at the attachment position of the superconducting magnet excitation tool 200 ⁇ / b> A on the outer surface of the vacuum vessel 7. ing.
  • the illustration of the permanent current switch lead adapter 20, the energization lead 30, and the permanent current switch lead 10 is omitted. These are separately installed and connected in the same manner as the superconducting coil lead adapter 19, the exciting lead 29, and the superconducting coil lead 9.
  • the movable connector plate 18A has a fitting recess 18a that is thinned in a cylindrical shape at the center of the outer surface. Moreover, it has the guide part 18b in the periphery of the opening end of the fitting recessed part 18a.
  • the guide portion 18b is annularly provided with a height from the outer surface of the movable connector plate 18A, and surrounds the fitting recess 18a.
  • the inner peripheral surface of the guide portion 18b is tapered from the outside of the movable connector plate 18A toward the fitting recess 18a, and is continuous with the inner peripheral surface of the fitting recess 18a.
  • the front end portion of the heat transfer connecting member 60 is guided to the fitting recess 18a along the inner circumferential surface of the guide portion 18b.
  • the superconducting magnet excitation tool 200A includes a cover body 25A, an excitation lead 29, an energization lead 30 (not shown), and a single-stage lead refrigerating machine 34A.
  • the cover body 25A has a flange portion 25a and an exhaust hole 25c similar to the cover body 25, and has a through hole 25d at the top.
  • a plurality of screw shafts 40 are suspended from the outer surface of the top portion of the cover body 25A around the base end side bellows 36A, and the tip end side of the screw shaft 40 is a through hole provided in the base end side flange plate 38A. It is loosely inserted into the hole and fastened.
  • Each of the input / output pair of excitation leads 29 and the input / output pair of energization leads 30 are fixed to the proximal end side flange plate 38A.
  • the lead refrigerator 34A includes a first stage 34a on the inner side facing the movable connector plate 18A.
  • a Gifford-McMahon (GM) refrigerator for example, a Gifford-McMahon (GM) refrigerator, a Stirling refrigerator, a pulse tube refrigerator, or the like can be used.
  • GM Gifford-McMahon
  • the refrigerating machine 34A is fixed to the proximal end flange plate 38A through the proximal end flange plate 38A that fixes the excitation lead 29 and the energization lead 30 (not shown).
  • the height of the base end side flange plate 38 ⁇ / b> A from the top of the cover body 25 ⁇ / b> A is variable as the base end side bellows 36 is expanded and contracted by adjusting the fixing position by the nut 41. That is, the refrigerating machine 34A is provided so as to be integrated with the exciting lead 29 and the energizing lead 30 so as to advance and retreat toward the opening of the cover body 25A.
  • a leading end flange plate (heat conducting member) 43A having rigidity and high thermal conductivity is fixed to the first stage 34a of the refrigerating machine 34A.
  • Each of the excitation lead 29 and the energization lead 30 passes through the front end side flange plate 43A, and is fixed to the front end side flange plate 43A at each front end side. That is, the leading end flange plate 43 ⁇ / b> A having rigidity and high thermal conductivity thermally connects the lead refrigerator 34 ⁇ / b> A to the excitation lead 29 and the energization lead 30.
  • the front end side flange plate 43A has a heat transfer connecting member 60 suspended from the movable connector plate 18A on the surface facing the movable connector plate 18A.
  • the heat transfer connecting member 60 has a proximal end fixed to the surface of the distal side flange plate 43A facing the movable connector plate 18A, and is fitted to the distal end of the fitting recess 18a of the movable connector plate 18A. Part 60a.
  • the heat transfer connecting member 60 is provided integrally with the exciting lead 29 and the energizing lead 30 fixed to the front end side flange plate 43A so as to be able to advance and retract toward the opening of the cover body 25A. Then, the fitting portion 60a of the heat transfer connecting member 60 is fitted into the fitting recess 18a, so that the first stage 34a of the lead refrigerator 34A and the movable connector plate 18A can be thermally connected. Yes.
  • the front end flange plate 43A and the heat transfer connecting member 60 are heat conductive members having rigidity and high thermal conductivity, and are preferably formed of aluminum nitride or silicon carbide.
  • Aluminum nitride or silicon carbide has a thermal conductivity of 300 W / (m ⁇ K) or more and 500 W / (m ⁇ K) or less at a temperature of 100K, and a thermal conductivity of 200 W / (m ⁇ K) or more and 300 W at a temperature of 50K. It is preferable to reach below / (m ⁇ K).
  • the tip side flange plate 43A and the heat transfer connecting member 60 are made of conductive, high heat conductor such as copper or copper alloy, and contact with other members as shown by shading in the following drawings.
  • the surface may be insulated with an insulating tape, an insulating washer or the like.
  • the exciting lead 29 and the superconducting coil 1 are used in the permanent current mode and the like, as in the superconducting magnet device 100 and the superconducting magnet exciting tool 200.
  • the energization lead 30 and the permanent current switch 3 can be in a state of not being thermally connected. Therefore, heat transfer from the external room temperature space to the superconducting coil 1 and the permanent current switch 3 through the exciting lead 29 and the energizing lead 30 can be satisfactorily suppressed.
  • the heat load applied to the superconducting coil refrigerator 4 can be suppressed, and the cooling load associated with cooling the superconducting coil 1 to a predetermined temperature below the transition temperature can be reduced.
  • the refrigerating machine 34A is provided so as to be able to advance and retreat toward the opening of the cover body 25A, and the exciting lead 29 and the energization are conducted via a heat conducting member (front end side flange plate 43A) having rigidity and high thermal conductivity.
  • the lead 30 is thermally connected. Therefore, the heat transfer resistance can be kept low compared with the case where the heat conducting member having flexibility (second heat conducting member, fifth heat conducting member) is used like the superconducting magnet exciting tool 200 described above, and for exciting.
  • the cooling load accompanying the cooling of the lead 29, the energizing lead 30, etc. is further reduced.
  • the lead refrigerator 34A is supported by the cover body 25A integrally with the excitation lead 29 and the energization lead 30. Therefore, as compared with the superconducting magnet excitation tool 200, the internal structure of the cover body 25A is simplified. In other words, it is advantageous in that the total area of joints that exert heat transfer resistance and the number of components are reduced, and the cooling efficiency is excellent and the configuration is suitable for downsizing.
  • FIG. 7 is a cross-sectional view showing an example of a superconducting magnet excitation tool according to the third embodiment of the present invention.
  • the superconducting magnet device 100B according to the third embodiment includes a fitting recess 18a and a guide portion 18b at the mounting position on the outer surface of the vacuum vessel 7, as in the superconducting magnet device 100A.
  • the movable connector plate 18A is provided.
  • a superconducting magnet excitation tool 200B for exciting the superconducting coil 1 is attached to the outer surface of the vacuum vessel 7 provided in the superconducting magnet device 100B according to the third embodiment.
  • the lead refrigerator 34B is indirectly fixed to the exciting lead 29 and the energizing lead 30 (not shown), similarly to the superconducting magnet exciting tool 200A.
  • the lead refrigerator 34B is provided integrally with the excitation lead 29 and the energization lead 30 so as to be able to advance and retreat.
  • the superconducting magnet excitation tool 200B is different from the superconducting magnet excitation tool 200A in that a two-stage lead refrigerator 34B is provided as a lead refrigerator.
  • the superconducting magnet excitation tool 200B includes a cover body 25A, an excitation lead 29, an energization lead 30, and a two-stage lead refrigerating machine 34B.
  • the cover body 25A has a flange portion 25a and an exhaust hole 25c similar to the cover body 25, and has a through hole 25d at the top.
  • a plurality of screw shafts 40 are suspended from the outer surface of the top portion of the cover body 25A around the base end side bellows 36A, and the tip end side of the screw shaft 40 is a through hole provided in the base end side flange plate 38A. It is loosely inserted into the hole and fastened.
  • Each of the input / output pair of excitation leads 29 and the input / output pair of energization leads 30 are fixed to the proximal end side flange plate 38A.
  • the lead refrigerator 34B includes a first stage 34a and a second stage 34b on the inner side facing the movable connector plate 18A.
  • a Gifford-McMahon (GM) refrigerator for example, a Stirling refrigerator, a pulse tube refrigerator, or the like can be used in the same manner as the lead refrigerator 34 described above.
  • GM Gifford-McMahon
  • the refrigerating machine 34B is fixed to the proximal end flange plate 38A through the proximal end flange plate 38A to which the excitation lead 29 and the energization lead 30 are fixed.
  • the height of the base end side flange plate 38 ⁇ / b> A from the top of the cover body 25 ⁇ / b> A is variable as the base end side bellows 36 is expanded and contracted by adjusting the fixing position by the nut 41. That is, the lead refrigerator 34B is provided integrally with the excitation lead 29 and the energization lead 30 so as to advance and retreat toward the opening of the cover body 25A, similarly to the lead refrigerator 34A.
  • a leading end flange plate (heat conducting member) 43A having rigidity and high thermal conductivity is fixed to the first stage 34a of the refrigerating machine 34B.
  • Each of the excitation lead 29 and the energization lead 30 passes through the front end side flange plate 43A, and is fixed to the front end side flange plate 43A at each front end side. That is, the leading end flange plate 43 ⁇ / b> A having rigidity and high thermal conductivity thermally connects the lead refrigerator 34 ⁇ / b> A to the excitation lead 29 and the energization lead 30.
  • the second stage 34b of the refrigerating machine 34B protrudes inwardly through the distal end side flange plate 43A and facing the movable connector plate 18A.
  • the second stage 34b of the lead refrigerator 34B is thermally connected to the heat transfer connection member 60B that hangs down toward the movable connector plate 18A.
  • the heat transfer connecting member 60B has a base end fixed to the second stage 34b of the lead refrigerator 34B, and has a fitting portion 60a fitted to the fitting recess 18a of the movable connector plate 18A at the tip. ing.
  • the heat transfer connecting member 60B is provided integrally with the exciting lead 29 and the energizing lead 30 fixed to the front end flange plate 43A so as to be able to advance and retract toward the opening of the cover body 25A. Then, the fitting portion 60a of the heat transfer connecting member 60B is fitted into the fitting recess 18a, so that the second stage 34b of the lead refrigerator 34B and the movable connector plate 18A can be thermally connected. Yes.
  • the material of the heat transfer connection member 60 ⁇ / b> B can be selected similarly to the heat transfer connection member 60.
  • the energization lead 30 and the permanent current switch 3 can be in a state of not being thermally connected. Therefore, heat transfer from the external room temperature space to the superconducting coil 1 and the permanent current switch 3 through the exciting lead 29 and the energizing lead 30 can be satisfactorily suppressed.
  • the heat load applied to the superconducting coil refrigerator 4 can be suppressed, and the cooling load associated with cooling the superconducting coil 1 to a predetermined temperature below the transition temperature can be reduced.
  • the refrigerating machine 34B is provided so as to be able to advance and retreat toward the opening of the cover body 25A, heat transfer is performed via a heat conductive member (front end side flange plate 43A) having rigidity and high thermal conductivity. Resistance is kept low. Further, it is advantageous in that the internal structure of the cover body 25A is simplified. Further, since the lead refrigerator 34B is of a two-stage type, the exciting lead 29 and the energizing lead 30 are effectively conductively cooled by the second stage, which has a lower reached temperature than the first stage. can do.
  • the heat transfer connecting member 60B is shortened compared to the heat transfer connecting member 60 provided in the one-stage type and has good heat conduction, so that effective heat absorption through the movable connector plate 18A is possible. This is advantageous.
  • the structure of the above superconducting magnet device and superconducting magnet excitation tool can be replaced or changed to various structures as long as the effects of the present invention are not hindered.
  • the permanent current switch lead 10 is drawn out to the fixed connector plate 14, the permanent current switch lead adapter 20 is fixed to the movable connector plate 18, and the energization lead 30 is used. Is provided in the superconducting magnet excitation tool.
  • these configurations for electrically connecting the permanent current switch 3 and the operating current power source may not be provided in the superconducting magnet excitation tool. That is, the operating current to the permanent current switch 3 is lower than that of the lead through which the exciting current is passed, and may be energized via another electrical path.
  • the superconducting magnet device is a conduction cooling type superconducting magnet device using a refrigerator.
  • the present invention may be applied to an immersion cooling type superconducting magnet apparatus using a refrigerant.
  • a configuration in which a refrigerant storage container containing a refrigerant such as liquid helium is arranged inside the heat shield 5 and the superconducting coil 1 and the permanent current switch 3 are immersed in the refrigerant and cooled can be adopted.
  • the lead corresponding to the superconducting coil lead 9 and the permanent current switch lead 10 is in a state of being penetrated through the refrigerant storage container and drawn to the outside.
  • the superconducting coil refrigerator 4 may be omitted and may be used for recondensing the refrigerant.
  • superconducting coil lead adapter 19 and permanent current switch lead adapter 20 are provided, so that the superconducting magnet excitation tool can be detachably attached. Therefore, it is possible to obtain the same effect as the superconducting magnet device and the superconducting magnet excitation tool.
  • Such an immersion cooling type superconducting magnet device is suitable when a superconductor (low-temperature superconductor) such as niobium titanium (NbTi) is used for the superconducting coil 1.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

L'objet de la présente invention est de fournir un dispositif d'aimant supraconducteur et un accessoire d'excitation d'aimant supraconducteur qui peut supprimer le transfert de chaleur à une bobine supraconductrice par l'intermédiaire d'un conducteur d'excitation et peut réduire la charge de refroidissement pour une bobine supraconductrice. Un dispositif d'aimant supraconducteur (100) comprend : une bobine supraconductrice (1) ; un commutateur de courant permanent (3) ; un récipient sous vide (7) ; un conducteur (9) de bobine supraconductrice qui peut alimenter la bobine supraconductrice en courant d'excitation ; des soufflets (16) ; et un connecteur mobile (18) qui a une borne côté interne qui peut se connecter au conducteur (9) de bobine supraconductrice sur un côté qui fait face à une surface externe du récipient sous vide (7) et une borne côté externe qui peut se connecter à un conducteur d'excitation (29) sur le côté opposé, le connecteur mobile (18) se déplaçant en effectuant un mouvement de va-et-vient, par l'intermédiaire de la dilatation et de la contraction des soufflets fixes (16), entre un état dans lequel la borne côté interne et la borne côté externe sont connectées et un état dans lequel la borne côté interne et la borne côté externe ne sont pas connectées. Un accessoire (200) d'excitation d'aimant supraconducteur comprend : un conducteur d'excitation (29) ; un refroidisseur (34) de conducteur ; et un corps (25) de couvercle. L'accessoire (200) d'excitation d'aimant supraconducteur est monté sur le dispositif d'aimant supraconducteur (100), sur sa surface externe sur laquelle est disposé le connecteur mobile (18).
PCT/JP2016/079173 2015-10-02 2016-09-30 Dispositif d'aimant supraconducteur et accessoire d'excitation d'aimant supraconducteur WO2017057760A1 (fr)

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US11508506B2 (en) * 2016-04-12 2022-11-22 Koninklijke Philips N.V. Lead and thermal disconnect for ramping of an MRI or other superconducting magnet
CN112133514A (zh) * 2019-06-25 2020-12-25 布鲁克瑞士股份公司 具有弹簧弹性的、导热的连接元件的低温恒温器组件
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JP7385329B1 (ja) 2023-06-30 2023-11-22 株式会社関東技研 霧箱

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