JP2010267661A - Superconducting magnet device unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling efficiency in a superconducting coil without increasing a cost concerning a superconducting magnet device unit having a cooling means for cooling the superconducting coil. <P>SOLUTION: The superconducting magnet device unit includes a superconducting magnet device 10 and a heat absorber 20. The superconducting magnet device 10 includes: the superconducting coil 13; a freezing machine 18 for performing cooling to allow the superconducting coil 13 to be in a superconducting state; and load support bodies 15, 16 for supporting the superconducting coil 13. The heat absorber 20 includes: a heat absorption tank 21 for storing liquid helium; a heat-transfer member 22A for thermally connecting the heat absorption tank 21 to the superconducting coil 13; and a heat switch 23 for turning on/off the thermal connection between the heat absorption tank 21 and the superconducting coil 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a superconducting magnet device unit, and more particularly to a superconducting magnet device unit having cooling means for cooling a superconducting coil.

  A conventional superconducting magnet apparatus is shown in FIG. A superconducting magnet device 100 shown in the figure includes a superconducting coil 103, a heat transfer stage 104, a load support 105, a heat shield plate 107, a refrigerator 108, an iron core 110, and the like.

  The iron core 110 has airtightness and can be evacuated. Superconducting coil 103 is formed of a low-temperature superconducting wire. Further, the superconducting coil 103 is configured to be externally fed by a superconducting lead (not shown), whereby the superconducting coil 103 generates a magnetic field.

  The refrigerator 108 is a two-stage refrigerator, and the first stage 108 a is thermally connected to the heat shield plate 107, and the second stage 108 b is thermally connected to the superconducting coil 103 via the heat transfer stage 104. ing. The superconducting coil 103 is thermally connected to the heat transfer member 104. When the heat transfer member 104 is cooled by the refrigerator 108, the superconducting coil 103 is also cooled. Further, the heat shield plate 107 is cooled by the refrigerator 108 to block heat (radiant heat) transmitted from the outside of the apparatus to the superconducting coil 103.

  The load support 105 supports a load applied to the superconducting coil 103 when a magnetic field is generated. Since this load support 105 is directly connected to the superconducting coil 103 from the iron core 110 at room temperature, it becomes a heat intrusion source to the superconducting coil 103. Therefore, in order to suppress the heat intrusion into the superconducting coil 103, the load support 105 is thermally connected to the heat shield plate 107 cooled by the refrigerator 108.

JP 2004-281469 A JP 2001-167923 A

  In the conventional superconducting magnet device 100 described above, the refrigerator 108 is the only means for cooling the superconducting coil 103. In consideration of the startability of the superconducting magnet device 100, it is desirable that the time required for the superconducting coil 103 to be cooled until it becomes a superconducting state is shorter. As a method of shortening the cooling time in this way, a method of increasing the number of installed refrigerators 108 or a method of increasing the refrigerating capacity of the refrigerator 108 can be considered.

  However, these methods have a problem that the superconducting magnet device 100 is increased in size. Further, since the refrigerator 108 is expensive, there is a problem that the cost of the superconducting magnet device 100 increases when the number of the refrigerators 108 is increased.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a superconducting magnet device unit capable of improving the cooling efficiency of the superconducting coil without increasing the cost.

From the first point of view, the above problem is
A superconducting magnet device having a superconducting coil, a refrigerator that cools the superconducting coil into a superconducting state, and a load support that supports the superconducting coil;
This can be solved by a superconducting magnet device unit having a heat absorption device for absorbing heat of the superconducting coil and / or the load support.

In addition, the above problem is from the second point of view.
A superconducting magnet device having a superconducting coil, a refrigerator that cools the superconducting coil into a superconducting state, and a load support that supports the superconducting coil;
This can be solved by a superconducting magnet device unit having a heat absorption device that absorbs the heat of the load support.

  According to the disclosed superconducting magnet device unit, the superconducting coil has two cooling systems, such as a cooling system that is frozen by a refrigerator and a cooling system that is cooled by absorbing heat by a heat absorbing device. Can be efficiently cooled in a short time.

  Also, the heat absorption device absorbs the heat of the load support body, so that it is possible to reduce the heat from entering the superconducting magnet device from the outside via the load support member, and thus the superconducting coil can be efficiently and quickly It becomes possible to cool by.

FIG. 1 is a configuration diagram showing a state before starting the superconducting magnet apparatus unit according to the first embodiment of the present invention. FIG. 2 is a configuration diagram showing a coil cooling state of the superconducting magnet device unit according to the first embodiment of the present invention. FIG. 3 is a configuration diagram showing a coil operating state of the superconducting magnet apparatus unit according to the first embodiment of the present invention. FIG. 4 is a configuration diagram showing a state before starting of the superconducting magnet device unit according to the second embodiment of the present invention. FIG. 5 is a block diagram showing the coil cooling state of the superconducting magnet device unit according to the second embodiment of the present invention. FIG. 6 is a block diagram showing the coil operating state of the superconducting magnet device unit according to the second embodiment of the present invention. FIG. 7 is a block diagram of a superconducting magnet device unit which is a modification of the first and second embodiments of the present invention. FIG. 8 is a configuration diagram of a conventional superconducting magnet device.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a superconducting magnet device unit 1A according to the first embodiment of the present invention. A superconducting magnet device unit 1A shown in the figure is applied to, for example, a deflection electromagnet for a proton beam therapy device gantry. The superconducting magnet device unit 1A is generally composed of a superconducting magnet device 10 and a heat absorbing device 20.

  The superconducting magnet device 10 is a refrigerator-cooled superconducting magnet device. In short, the superconducting magnet device 10 includes an iron core 12, a superconducting coil 13, a vacuum side load support 15, an air side load support 16, a heat shield plate 17, a refrigerator 18, and the like. Have.

  The iron core 12 is an airtight container and is connected to a vacuum pump (not shown). By moving this vacuum pump, the inside of the iron core 12 is in a vacuum state. The iron core 30 functions as a yoke for guiding the magnetic flux generated in the superconducting coil 13, and thus the magnetic flux generated in the superconducting coil 13 can be made uniform by providing the iron core 30.

  The superconducting coil 13 is disposed inside the iron core 12. The superconducting coil 13 is formed of a superconducting wire, and in this embodiment is formed of a high temperature superconducting wire. As the high-temperature superconducting wire of the superconducting coil 13, for example, Bi2223, Bi2212, Y123, MgB2, FeAs, oxide superconductor, or the like can be used. The superconducting coil 13 is configured to be wound around a winding frame 13a. In the present embodiment, a high-temperature superconducting wire is used as the superconducting wire, but a configuration using a low-temperature superconducting wire can also be used.

  The superconducting coil 13 is fed using a current line (not shown). In this current line, a material having high electrical conductivity (for example, copper, aluminum, etc.) is used between the iron core 12 and the heat shield plate 17, and a superconducting current lead is used between the heat shield plate 17 and the superconducting coil 13. It is done.

  The refrigerator 18 is fixed to the iron core 12. In the present embodiment, a Gifford McMahon type (GM type) refrigerator is used as the refrigerator 18. This GM type refrigerator 18 is configured such that a displacer reciprocates in a cylinder by driving an internal motor. And by the reciprocating movement of this displacer, it is set as the structure which carries out adiabatic expansion of the high-pressure refrigerant | coolant supplied from the refrigerator compressor which is not shown in figure, and this generates cold.

  The GM refrigerator 18 is a two-stage refrigerator. The first stage 18 a is connected to the heat shield plate 17, and the second stage 18 b is connected to the superconducting coil 13 via the heat transfer stage 14. The heat conduction stage 14 is cooled to about 70K to 110K by the first stage portion 18a of the refrigerator 18. Further, the heat transfer stage 14 thermally connected to the superconducting coil 13 is cooled to about 10K to 40K by the two-stage portion 18b. Therefore, the superconducting coil 13 connected to the heat conducting stage 14 is cooled by the refrigerator 18 to realize a superconducting state.

  In the present embodiment, the load support that supports the superconducting coil 13 includes a vacuum side load support 15 and an atmosphere side load support 16. The load supports 15 and 16 are made of a high-strength insulating material (GFRP, CFRP, etc.).

  Further, one end portion of the vacuum side load support 15 is fixed to the heat conduction stage 14, and the other end portion is inserted into a hole portion 25 formed in the iron core 12. The atmosphere-side load support 16 is configured to be movable in the direction of arrows Z1 and Z2 in the drawing by a driving mechanism (not shown).

  Further, a bellows 19 serving as a partition wall is provided inside the hole 25, and the hole 25 is defined by the bellows 19 on the vacuum side and the atmosphere side. Therefore, the inside of the iron core 12 is maintained in a vacuum. The bellows 19 has a bellows shape, and is configured to be displaceable in the directions of arrows Z1 and Z2 in the drawing while maintaining the vacuum state in the iron core 12. The end on the Z2 direction side of the vacuum side load support 15 and the end on the Z1 direction side of the atmosphere side load support 16 are configured to face each other via a bellows 19.

  The heat shield plate 17 is provided so as to surround the superconducting coil 13. The heat shield plate 17 is thermally connected to the first stage portion 18a of the refrigerator 18 as described above. Therefore, by providing the heat shield plate 17, the radiant heat entering the superconducting coil 13 can be reduced. The heat shield plate 17 is made of a material having excellent heat transfer characteristics such as copper or aluminum.

  Next, the heat absorbing device 20 will be described.

  The heat absorbing device 20 includes a heat absorbing tank 21, a heat transfer member 22 </ b> A, and a heat switch 23. The endothermic tank 21 functions as an accommodating portion in which liquid helium serving as a refrigerant is accommodated. The heat absorption tank 21 is supplied with liquid helium from a liquid helium supply means (not shown).

  The heat transfer member 22A is formed of a material having high thermal conductivity (for example, copper, aluminum, etc.). One end of the heat transfer member 22 </ b> A is thermally connected to the heat absorption tank 21, and the other end is thermally connected to the heat conduction stage 14 disposed in the iron core 12. The heat transfer member 22A is configured to be covered with a heat insulating material in order to prevent external heat from entering. As this heat insulating material, for example, a multilayer heat insulating material (MLI) can be used.

  Further, a thermal switch 23 is provided in the middle of the heat transfer member 22A. The heat switch 23 is a switch that thermally connects (ON) and releases (OFF) the heat transfer member 22A on the heat absorption tank 21 side and the heat transfer member 22A on the heat conduction stage 14 side. When the heat switch 23 is turned ON, the heat conduction stage 14 and the heat absorption tank 21 are thermally connected, so that the heat of the heat conduction stage 14 is absorbed by the heat absorption tank 21 via the heat transfer member 22A, and thus the heat conduction stage. 14 is cooled. Further, when the thermal switch 23 is turned off, the heat conduction stage 14 and the endothermic tank 21 are thermally shut off.

  Next, the operation of the superconducting magnet device unit 1A will be described.

  FIG. 1 shows a state before the superconducting magnet device 10 is activated (referred to as a pre-activation state). In the state before the start-up, the refrigerator 18 is stopped and the power supply to the superconducting coil 13 is also stopped. In this state, the endothermic tank 21 is supplied with liquid helium from the connected liquid helium supply means. Therefore, the internal temperature of the endothermic tank 21 is about 4.2K to 5.0K. The capacity of the endothermic tank 21 is set based on the cooling temperature of the superconducting coil 13, the volume of the heat conducting stage 14, and the like.

  On the other hand, the heat switch 23 constituting the heat absorbing device 20 is in an OFF state in the state before starting. Therefore, the superconducting coil 13 (heat conduction stage 14) and the endothermic tank 21 are in a thermally separated state. Therefore, the superconducting coil 13 is not cooled (heat absorption) by the heat absorption tank 21 in the state before starting. Further, the atmosphere side load support 16 is moved in the Z2 direction by the driving device, and therefore the vacuum side load support 15 and the atmosphere side load support 16 are in a separated state.

  FIG. 2 shows a state in which the superconducting magnet device 10 is activated and the superconducting coil 13 is being cooled (hereinafter referred to as a coil cooling state). In the coil cooling state, the refrigerator 18 is activated, the first stage 18 a cools the heat shield plate 17, and the second stage 18 b cools the superconducting coil 13 via the heat conduction stage 14. In addition, when the refrigerator 18 is performing the cooling process, the refrigerator 18 is shown in black in the drawing.

  On the other hand, the heat switch 23 constituting the heat absorbing device 20 is switched from OFF to ON when the superconducting magnet device unit 1A is in the coil cooling state. Thereby, the superconducting coil 13 (heat conduction stage 14) and the heat absorption tank 21 are thermally connected, and the heat of the heat conduction stage 14 is absorbed by the heat absorption tank 21 through the heat transfer member 22A. Thereby, the superconducting coil 13 is cooled by the heat absorption tank 21 together with the refrigerator 18. When the heat switch 23 is turned on and the heat absorption tank 21 is performing the cooling (heat absorption) process of the superconducting coil 13, the heat transfer member 22A is shown in black in the drawing.

  Further, the atmosphere side load support 16 is maintained in a state of moving in the Z2 direction, and therefore the vacuum side load support 15 and the atmosphere side load support 16 are in a separated state. Although the atmosphere side load support 16 is located on the atmosphere side at room temperature, by separating the vacuum side load support 15 from the atmosphere side load support 16, the atmosphere side load support 16 is externally connected to the superconducting coil 13. It is possible to prevent the heat from entering.

  FIG. 3 shows a state in which the superconducting coil 13 is cooled to the superconducting state and is supplied with power to generate a magnetic field (hereinafter referred to as a coil operating state). In the coil operating state, the refrigerator 18 maintains cooling of the heat shield plate 17 and the superconducting coil 13. In addition, the heat switch 23 is also maintained in the ON state, so that the heat of the heat conduction stage 14 is absorbed by the heat absorption tank 21 through the heat transfer member 22A. Thereby, the superconducting coil 13 maintains the state cooled by the refrigerator 18 and the endothermic tank 21.

  On the other hand, since the superconducting coil 13 generates a magnetic field in the coil operating state, a load is applied to the superconducting coil 13 by the generated magnetic force. In particular, in the present embodiment, since the iron core 12 that is a magnetic body is provided so as to cover the superconducting coil 13, a large load is applied to the superconducting coil 13.

  Therefore, in the present embodiment, when the superconducting magnet device unit 1A is in the coil operating state, the vacuum side load support 15 and the atmosphere side load support 16 are connected. Specifically, the drive device connected to the atmosphere-side load support 16 moves the atmosphere-side load support 16 in the arrow Z1 direction until the superconducting magnet device 10 enters the coil operating state.

  Thus, the atmosphere side load support 16 first comes into contact with the bellows 19, but the bellows 19 has a bellows shape and can change in the directions of arrows Z 1 and Z 2, so the atmosphere side load support 16 covers the bottom of the bellows 19. It moves toward the vacuum side load support 15 while pressing. And the atmosphere side load support body 16 will be in the state connected with the vacuum side load support body 15 via the bellows 19 in between.

  The drive device that drives the atmosphere side load support 16 has a strong structure and is set to support the load applied to the superconducting coil 13. Therefore, even when the vacuum side load support 15 and the atmosphere side load support 16 are separated, the load of the superconducting coil 13 is connected to each load support 15, 16 by connecting the load supports 15, 16. 16 is reliably supported.

  On the other hand, the superconducting magnet device 10 may temporarily stop the generation of a magnetic field (hereinafter referred to as a standby state). In this standby state, power supply to the superconducting coil 13 is stopped, so that the load applied to the superconducting coil 13 due to the magnetic field is temporarily lost. However, the refrigerator 18 keeps cooling the superconducting coil 13 so that it can be restarted immediately, and the heat switch 23 also keeps the ON state by continuing the cooling of the superconducting coil 13 by the endothermic tank 21 ( This is the same state as in FIG.

  On the other hand, the atmosphere side load support 16 is moved away from the vacuum side load support 15 by moving in the Z2 direction by the driving device. Thereby, it is possible to prevent external heat from being transmitted to the vacuum side load support 15 via the vacuum side load support 15, thereby increasing the cooling efficiency of the heat conduction stage 14 by the refrigerator 18 and the endothermic tank 21. Can do.

  As described above, the superconducting magnet device unit 1 </ b> A according to the present embodiment cools the superconducting coil 13 in the coil cooling state by cooling with the refrigerator 18 and also by the heat absorbing device 20.

  That is, the heat absorption device 20 thermally connects the heat absorption tank 21 and the superconducting coil 13 (heat conduction stage 14) by turning on the heat switch 23, and absorbs the heat of the superconducting coil 13 into the heat absorption tank 21. The cooling process is performed. Therefore, it is possible to cool the superconducting coil 13 to a temperature at which the superconducting coil 13 is brought into a superconducting state in a short time as compared with the configuration in which the superconducting coil 13 is cooled only by the refrigerator 18. Moreover, since it is not necessary to provide a plurality of expensive refrigerators 18, the superconducting magnet device 10 can be reduced in size and cost.

  Next, a second embodiment of the present invention will be described.

  4 to 6 show a superconducting magnet device unit 1B according to the second embodiment. FIG. 4 shows the superconducting magnet device unit 1B in a state before starting, FIG. 5 shows the superconducting magnet device unit 1B in the coil cooling state, and FIG. 6 shows the superconducting magnet device unit 1B in the coil operating state. Yes. 4 to 6, the same reference numerals are given to the components corresponding to those shown in FIGS. 1 to 3, and the description thereof will be omitted.

  In the first embodiment described above, the heat transfer member 22A constituting the heat absorption device 20 is connected to the heat conduction stage 14 provided with the superconducting coil 13, and the heat of the superconducting coil 13 is transferred to the heat absorption tank 21 via the heat transfer member 22A. The superconducting coil 13 is cooled by absorbing the heat.

  In contrast, the present embodiment is characterized in that the heat transfer member 22 </ b> B constituting the heat absorbing device 20 is connected to the atmosphere side load support 16. The heat transfer member 22B is configured to maintain the connection state even when the atmosphere-side load support 16 moves in the directions of arrows Z1 and Z2.

  In this embodiment, the heat absorption tank 21 constituting the heat absorption device 20 absorbs heat from the atmospheric load support 16 to prevent heat from entering the superconducting coil 13 from the atmospheric load support 16 at room temperature. To do. For this reason, the endothermic amount absorbed by the endothermic tank 21 is smaller than that of the first embodiment, and hence the volume of the endothermic tank 21 can be reduced as compared with the first embodiment.

  Next, the operation of the superconducting magnet device unit 1B configured as described above will be described. FIG. 4 shows a state before activation. In the pre-startup state, the atmosphere side load support 16 is moved in the Z2 direction by the driving device, and thus is separated from the vacuum side load support 15.

  Further, in the state before starting, the heat switch 23 is OFF, and therefore the heat absorption tank 21 and the atmosphere side load support 16 are in a state of being thermally shut off. Therefore, the atmosphere side load support 16 is not endothermic (cooled) by the endothermic tank 21 in the state before starting. Also in the present embodiment, liquid helium is supplied to the endothermic tank 21 in this pre-activation state.

  FIG. 5 shows the coil cooling state. In the coil cooling state, the refrigerator 18 is activated to cool the heat shield plate 17 and the superconducting coil 13. At this time, also in the present embodiment, the thermal switch 23 is switched from OFF to ON, and the atmosphere-side load support 16 and the endothermic tank 21 are thermally connected. Therefore, the heat of the atmosphere side load support 16 is absorbed by the heat absorption tank 21 via the heat transfer member 22A.

  Thereby, in the coil cooling state, it is possible to more reliably prevent the external heat set to room temperature from being transferred to the superconducting coil 13 via the atmosphere side load support 16. By effectively preventing heat intrusion from the outside in this way, the cooling efficiency of the superconducting coil 13 by the refrigerator 18 is increased, and thus the superconducting coil 13 can be cooled to a temperature at which a superconducting state can be realized in a short time. it can. Moreover, in this coil cooling state, the atmosphere side load support body 16 is maintaining the state which moved to Z2 direction.

  In the present embodiment, the configuration is shown in which the atmosphere-side load support 16 is separated from the vacuum-side load support 15 in the coil cooling state, but the atmosphere-side load support 16 is connected to the vacuum-side load support 15. It is good also as the structure which carried out. With this configuration, the atmosphere-side load support 16 is thermally connected to the superconducting coil 13 via the vacuum-side load support 15, so that the heat of the superconducting coil 13 is absorbed (cooled) by the endothermic tank 21. Is possible. Thereby, the cooling efficiency of the superconducting coil 13 can be improved.

  FIG. 6 shows the coil operating state. Since the superconducting coil 13 generates a magnetic field in the coil operating state, a load is applied to the superconducting coil 13 due to this. For this reason, the atmosphere side load support 16 is moved in the Z1 direction by the driving device, and is connected to the vacuum side load support 15 via the bellows 19. Thereby, the load applied to the superconducting coil 13 is supported by the load supports 15 and 16.

  Moreover, although the atmosphere side load support body 16 is located in the atmosphere side, in this embodiment, the atmosphere side load support body 16 is connected to the heat absorption apparatus 20 via the heat transfer member 22B. The thermal switch 23 constituting the heat absorbing device 20 is switched to the ON state in the coil operating state. Therefore, the heat of the atmosphere side load support 16 is absorbed by the heat absorption tank 21 via the heat transfer member 22B, and the atmosphere side load support 16 is cooled. Thereby, even if the atmosphere side load support 16 is connected to the vacuum side load support 15, external heat is not conducted to the superconducting coil 13 via the load supports 15, 16.

  As described above, the superconducting magnet device unit 1B according to the present embodiment connects the atmosphere-side load support 16 to the heat absorption device 20, so that external heat is applied to the superconducting coil 13 via the atmosphere-side load support 16. Heat transfer can be prevented, and thus the superconducting coil 13 can be brought into a superconducting state in a short time. Moreover, since it is not necessary to provide a plurality of expensive refrigerators 18, the superconducting magnet device 10 can be reduced in size and cost.

  FIG. 7 shows a superconducting magnet device unit 1C which is a modification of the superconducting magnet device units 1A and 1B according to the first and second embodiments. In the first embodiment, the heat absorption device 20 is connected only to the superconducting coil 13, and in the second embodiment, the heat absorption device 20 is connected only to the atmosphere side load support 16.

  However, the connection of the heat absorption device 20 is not limited to the configuration in which the heat absorption device 20 is connected to only one of the superconducting coil 13 or the atmosphere side load support 16, and the heat absorption device 20 is connected to the superconducting coil 13 and the like as in this modification. It is good also as a structure connected to both the atmosphere side load supports 16. At this time, the thermal switch 23 selectively selects the heat transfer member 22C connected to the heat absorption tank 21 as the heat transfer member 22A connected to the superconducting coil 13 or the heat transfer member 22B connected to the atmospheric load support 16. It is configured to be connectable to.

  Also in the superconducting magnet device unit 1C according to the above-described modification, the superconducting coil 13 can be brought into the superconducting state in a short time in the coil cooling state, and the increase in size and cost of the device can be suppressed.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

  For example, the heat transfer members 22 </ b> A and 22 </ b> B may be configured to be detachable from the superconducting magnet device 10 using a thermal connector or the like, and thereby the heat absorbing device 20 may be detachable from the superconducting magnet device 10. .

1A to 1C Superconducting magnet device unit 10 Superconducting magnet device 12 Iron core 13 Superconducting coil 14 Heat conduction stage 15 Vacuum side load support 16 Atmosphere side load support 17 Heat shield plate 18 Refrigerator 19 Bellows 20 Endothermic device 21 Endothermic tank 22A, 22B , 22C Heat transfer member 23 Thermal switch

Claims (8)

A superconducting magnet device having a superconducting coil, a refrigerator that cools the superconducting coil into a superconducting state, and a load support that supports the superconducting coil;
A superconducting magnet device unit comprising: a heat absorbing device that absorbs heat of the superconducting coil. The endothermic device is
An accommodating portion in which a refrigerant is accommodated;
The superconducting magnet device unit according to claim 1, further comprising a heat conducting member that thermally connects the housing portion and the superconducting coil. The endothermic device is
The superconducting magnet device unit according to claim 1, further comprising a thermal switch that performs ON / OFF of heat absorption from the superconducting coil to the housing portion. A superconducting magnet device having a superconducting coil, a refrigerator that cools the superconducting coil into a superconducting state, and a load support that supports the superconducting coil;
A superconducting magnet device unit comprising a heat absorption device for absorbing heat of the load support. The endothermic device is
An accommodating portion in which a refrigerant is accommodated;
The superconducting magnet device unit according to claim 4, further comprising a heat conductive member that thermally connects the housing portion and the load support. The endothermic device is
The superconducting magnet device unit according to claim 4 or 5, further comprising a heat switch that performs ON / OFF of heat absorption from the load support to the housing portion. Separating the load support body into a vacuum side load support body and an atmosphere side load support body and providing a partition that defines the vacuum side and the atmosphere side, and the vacuum side load support body and the atmosphere side load support body are provided with It is configured to be able to connect and disconnect through the partition wall,
The superconducting magnet device unit according to any one of claims 4 to 6, wherein the heat absorption device is thermally connected to the atmospheric load support.   The superconducting magnet apparatus unit according to any one of claims 1 to 7, wherein the refrigerant is liquid helium.

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