Superconducting coil device

Abstract

To suppress heat input to a superconducting coil from an electrical connection member that electrically connects a plurality of superconducting coils, thereby preventing thermal destabilization of the superconducting coil.SOLUTION: A superconducting coil device includes a plurality of superconducting coils 11, a conductive electrical connection member 12 that electrically connects the plurality of superconducting coils 11, a heat transfer member 14 thermally connected to the electrical connection member 12 via an insulating member 13, and a cooling device 15 thermally connected to the heat transfer member 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a superconducting coil device configured by electrically connecting a plurality of superconducting coils. [Background technology]

[0002] Superconducting coils using superconductors are used in nuclear magnetic resonance (NMR) devices, magnetic resonance imaging (MRI) devices, rotating equipment such as motors and generators, bending electromagnets for accelerators, etc. In particular, in order to generate a high-intensity magnetic field or a highly uniform magnetic field distribution, a superconducting coil device may be configured by combining and arranging multiple superconducting coils. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-12182 A [Patent Document 2] JP 2020-136637 A [Patent Document 3] JP 2020-31119 A [Patent Document 4] JP 2000-114029 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such a superconducting coil device, it is necessary to electrically connect superconducting coils such as high-temperature superconducting coils to each other. However, when a connecting member is electrically connected to a superconducting coil by soldering or the like, the contact resistance between the superconducting coil and the connecting member becomes larger than the resistance of the superconducting coil. In addition, when the connecting member is a normal conductor, the resistance of the connecting member increases as the distance between the superconducting coils increases, i.e., the length of the connecting member increases, and a relatively large Joule heat is generated in the connecting member when electricity is applied. When the Joule heat in the connecting member is large, heat may penetrate into the superconducting coil, causing the superconducting coil to become locally hot near the connection with the connecting member. Such a local high temperature may cause thermal instability of the superconducting coil, causing the superconductor to quench and the superconducting coil to go into thermal runaway and burn out.

[0005] An embodiment of the present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a superconducting coil device that can suppress heat input to the superconducting coils from electrical connection members that electrically connect multiple superconducting coils, thereby preventing thermal instability of the superconducting coils. [Means for solving the problem]

[0006] A superconducting coil device in an embodiment of the present invention is characterized by comprising a plurality of superconducting coils, a conductive electrical connection member that electrically connects the plurality of superconducting coils, a heat transfer member that is thermally connected to the electrical connection member via an insulating member, and a cooling device that is thermally connected to the heat transfer member. Effect of the Invention

[0007] According to the embodiment of the present invention, it is possible to suppress heat input from an electrical connection member that electrically connects a plurality of superconducting coils to the superconducting coils, thereby preventing the superconducting coils from becoming thermally unstable. [Brief description of the drawings]

[0008] [Figure 1]1 is a schematic diagram showing the overall configuration of a superconducting coil device according to a first embodiment. [Diagram 2] FIG. 11 is a schematic diagram showing the overall configuration of a superconducting coil device according to a second embodiment. [Diagram 3] FIG. 11 is a schematic diagram showing electrical connection members and the like of a superconducting coil device according to a third embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] View from the V arrow in Figure 3. [Figure 6] FIG. 11 is a schematic diagram showing a heat transfer member and the like of a superconducting coil device according to a fourth embodiment. [Figure 7] FIG. 7 is a view taken along the arrow VII in FIG. [Figure 8] FIG. 8 is a view taken along the arrow VIII in FIG. [Figure 9] FIG. 13 is a schematic diagram showing the overall configuration of a superconducting coil device according to a fifth embodiment. [Figure 10] FIG. 13 is a schematic diagram showing the overall configuration of a superconducting coil device according to a sixth embodiment. [Figure 11] FIG. 11 is an enlarged view showing a schematic diagram of the microstructure of the insulating member shown in FIG. [Figure 12] FIG. 13 is a schematic diagram showing the overall configuration of a superconducting coil device according to a seventh embodiment. [Figure 13] FIG. 13 is a schematic diagram showing the overall configuration of a superconducting coil device showing a modified embodiment of FIG. 12. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [A] First embodiment (Fig. 1) Fig. 1 is a schematic diagram showing the overall configuration of a superconducting coil device according to the first embodiment. The superconducting coil device 10 shown in Fig. 1 is configured by electrically connecting a plurality of superconducting coils 11, and further includes, in addition to the superconducting coils 11, electrical connection members 12, insulating members 13, heat transfer members 14, and a cooling device 15.

[0010] The superconducting coil 11 is, for example, a high-temperature superconducting coil formed by winding a high-temperature superconducting wire (not shown) around an axis C. A plurality of superconducting coils 11 are arranged apart from each other in the direction of the axis C without contacting each other. Although FIG. 1 shows an example in which two superconducting coils 11 are arranged, three or more superconducting coils 11 may be arranged. Furthermore, these superconducting coils 11 may be arranged in a circular or linear shape on the same plane or on different planes.

[0011] The electrical connection member 12 is made of a conductive material and electrically connects two of the multiple superconducting coils 11 together to connect the multiple superconducting coils 11 in series. Although an example in which the electrical connection member 12 connects the multiple superconducting coils 11 from the outer periphery side is illustrated, the electrical connection member 12 may connect the multiple superconducting coils 11 from the inner periphery side. Moreover, the electrical connection member 12 may connect the multiple superconducting coils 11 from the front side or back side.

[0012] One end of the heat transfer member 14 is thermally connected to the electrical connection member 12 via the insulating member 13, and the other end is thermally connected to a cooling device 15 such as a refrigerator. In the case of two superconducting coils 11, the heat transfer member 14 is connected to one electrical connection member 12 via the insulating member 13. In the case of three or more superconducting coils 11, when two of the superconducting coils 11 are connected to each other via one electrical connection member 12, one heat transfer member 14 may be connected to a plurality of electrical connection members 12 via the insulating member 13, or each of the plurality of heat transfer members 14 may be connected to each of the plurality of electrical connection members 12 individually via the insulating member 13. In the case of three or more superconducting coils 11, when two of the superconducting coils 11 are connected to each other via one electrical connection member 12, the heat transfer member 14 may be connected to one of the electrical connection members 12 via the insulating member 13.

[0013] Here, the insulating member 13 is an insulating film such as polyimide or a bulk body of highly thermally conductive insulating ceramics such as AlN (aluminum nitride), and this insulating member 13 is inserted into the boundary between the electrical connection member 12 and the heat transfer member 14 in a state where it is in surface contact with the curved surface portion 16 of the electrical connection member 12. Alternatively, the insulating member 13 may be an insulating tape such as polyimide, and this insulating tape may be attached to a part or the entire surface of the front surface (curved surface portion 16) of the electrical connection member 12, or to a part or the entire surface of the back surface of the heat transfer member 14.

[0014] Furthermore, the insulating member 13 may be a thermosetting resin such as melamine resin, urea resin, epoxy resin, silicone resin, or phenol resin, or a thermally conductive insulating grease such as silicone grease, which may be applied to the boundary surface between the electrical connection member 12 and the heat transfer member 14, or to the entire surface of each of the front surface of the electrical connection member 12 and the back surface of the heat transfer member 14. Furthermore, the electrical connection member 12 and the heat transfer member 14 may be impregnated with the above-mentioned thermosetting resin as the insulating member 13 and molded.

[0015] As configured as above, the first embodiment provides the following effect (1). (1) Electrical connection members 12 that electrically connect multiple superconducting coils 11 are cooled by conduction through cooling device 15 via insulating member 13 and heat transfer member 14. Therefore, the heat transfer distance from electrical connection members 12 to a cooling device can be shortened compared to the conventional case in which electrical connection members 12 are cooled by a cooling device via superconducting coils 11. Therefore, the thermal resistance from cooling device 15 to electrical connection members 12 can be reduced, and electrical connection members 12 can be efficiently cooled by conduction. As a result, concentrated heat input from the electrical connection members to superconducting coils 11 can be suppressed, and thermal instability of superconducting coils 11 can be prevented.

[0016] [B] Second embodiment (Fig. 2) 2 is a schematic diagram showing the overall configuration of a superconducting coil device according to the second embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[0017] The second embodiment of the superconducting coil device 20 differs from the first embodiment in that a flat portion 21 is formed on the electrical connection member 12, and an insulating member 13 that is thermally connected to a heat transfer member 14 is in surface contact with this flat portion 21.

[0018] 2, a flat portion 21 is formed on the surface of the electrical connection member 12, a flat portion 22 provided on the back surface of the insulating member 13 is in surface contact with this flat portion 21, and a flat portion 24 formed on the back surface of the heat transfer member 14 is in surface contact with a flat portion 23 provided on the surface of the insulating member 13. This increases the contact area between the electrical connection member 12, the insulating member 13, and the heat transfer member 14.

[0019] The planar portion 21 of the electrical connection member 12, the planar portions 22 and 23 of the insulating member 13, and the planar portion 24 of the heat transfer member 14 may have a planar shape having a step, for example, and may be divided into a plurality of planar portions, and may further be provided at an incline.

[0020] As configured as above, the second embodiment provides the following effect (2). (2) The electrical connection member 12 is conductively cooled by the heat transfer member 14 using the flat portion 21 of the electrical connection member 12, the flat portions 22 and 23 of the insulating member 13, and the flat portion 24 of the heat transfer member 14. In this manner, the contact area between the electrical connection member 12, the insulating member 13, and the heat transfer member 14 is increased, so that the thermal resistance from the heat transfer member 14 to the electrical connection member 12 is reduced, thereby enabling efficient conductive cooling of the electrical connection member 12. As a result, concentrated heat input from the electrical connection member to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0021] [C] Third embodiment (FIGS. 3 to 5) 3 is a schematic diagram showing electrical connection members and the like of a superconducting coil device according to the third embodiment. In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[0022] The superconducting coil device 30 of the third embodiment differs from the first embodiment in that a notch 31 is formed in a part of the electrical connection member 12, and a part of the heat transfer member 14 is fitted into this notch 31 via an insulating member 13.

[0023] That is, a notch 31 is formed in the upper part of the electrical connection member 12, and this notch 31 is formed in a groove shape into which the insulating member 13 is fitted over the entire width direction. Also, a groove-shaped notch 32 into which the heat transfer member 14 is fitted over the entire width direction is formed in the upper part of the insulating member 13. The heat transfer member 14 is fitted into the notch 32 of the insulating member 13, and the insulating member 13 is fitted into the notch 31 of the electrical connection member 12, so that the heat transfer member 14 is fitted into the notch 31 of the electrical connection member 12 via the insulating member 13.

[0024] As configured as above, the third embodiment provides the following advantages (3) and (4). (3) By fitting a part of the heat transfer member 14 into the cutout 31 of the electrical connection member 12 via the insulating member 13, the number of contact surfaces among the electrical connection member 12, the insulating member 13, and the heat transfer member 14 increases, so that the contact area among the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be increased. This reduces the thermal resistance from the heat transfer member 14 to the electrical connection member 12, and allows efficient conductive cooling of the electrical connection member 12. As a result, concentrated heat input from the electrical connection member to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0025] (4) Since a part of the heat transfer member 14 is fitted into the cutout portion 31 of the electrical connection member 12 via the insulating member 13, the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be integrated into a structure. Therefore, the mechanical strength of the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be improved.

[0026] [D] Fourth embodiment (FIGS. 6 to 8) 6 is a schematic diagram showing a heat transfer member and the like of a superconducting coil device according to the fourth embodiment. In the fourth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[0027] The superconducting coil device 40 of the fourth embodiment differs from the first embodiment in that a recess 41 is formed in a part of the heat transfer member 14, and an electrical connection member 12 is fitted into this recess 41 via an insulating member 13.

[0028] That is, a recess 41 is formed in the lower part of the heat transfer member 14, and this recess 41 is formed in a groove shape into which the insulating member 13 is fitted over the entire periphery. Also, a groove-shaped recess 42 into which the upper part of the electrical connection member 12 is fitted over the entire periphery is formed in the lower part of the insulating member 13. The electrical connection member 12 is fitted over the entire upper periphery into the recess 42 of the insulating member 13, and the insulating member 13 is fitted over the entire periphery into the recess 41 of the heat transfer member 14, so that the electrical connection member 12 is fitted into the recess 41 of the heat transfer member 14 via the insulating member 13. At this time, the entire upper periphery of the electrical connection member 12 is surrounded by the heat transfer member 14.

[0029] As configured as above, the fourth embodiment provides the following advantages (5) and (6). (5) The electrical connection member 12 is fitted into the recess 41 of the heat transfer member 14 via the insulating member 13, and the number of contact surfaces between the electrical connection member 12, the insulating member 13, and the heat transfer member 14 is increased, so that the contact area between the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be increased. This reduces the thermal resistance from the heat transfer member 14 to the electrical connection member 12, and the electrical connection member 12 can be efficiently cooled by conduction. Furthermore, the entire upper periphery of the electrical connection member 12 is surrounded by the heat transfer member 14 via the insulating member 13, so that the electrical connection member 12 is also cooled by radiation from the portion surrounded by the heat transfer member 14. For these reasons, the electrical connection member 12 can be cooled more efficiently, and as a result, concentrated heat input from the electrical connection member to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0030] (6) Since the upper part of the electrical connection member 12 is fitted into the recess 41 of the heat transfer member 14 via the insulating member 13, the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be integrated into a structure. Therefore, the mechanical strength of the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can be improved.

[0031] [E] Fifth embodiment (FIG. 9) 9 is a schematic diagram showing the overall configuration of a superconducting coil device according to the fifth embodiment. In the fifth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[0032] The difference between the superconducting coil device 50 of the fifth embodiment and the first embodiment is that boundary members 51 and 52 having excellent adhesion to the boundary surfaces of at least one of the boundaries between the electrical connection member 12 and the insulating member 13 and the boundary between the insulating member 13 and the heat transfer member 14, for example, at both boundaries.

[0033] That is, boundary member 51 is disposed at the boundary between electrical connection member 12 and insulating member 13, and is in close contact with boundary surface 53 of electrical connection member 12 and boundary surface 54 of insulating member 13. Moreover, boundary member 52 is disposed at the boundary between insulating member 13 and heat transfer member 14, and is in close contact with boundary surface 55 of insulating member 13 and boundary surface 56 of heat transfer member 14.

[0034] These boundary members 51 and 52 are made of a thermosetting resin such as melamine resin, urea resin, epoxy resin, silicone resin, or phenol resin, or a thermally conductive grease such as silicone grease, and are applied to the boundary surfaces 53, 54, 55, and 56. The boundary members 51 and 52 may be made of a metal with good thermal conductivity such as Au, Ag, Cu, or In, and may be inserted between the boundary surfaces 53 and 54 and between the boundary surfaces 55 and 56, respectively. The boundary members 51 and 52 of the fifth embodiment can also be installed at the boundary surfaces of the insulating members 13 of the first to fourth embodiments.

[0035] As configured as above, the fifth embodiment provides the following effect (7). (7) The boundary member 51 is disposed between the boundary surface 53 of the electrical connection member 12 and the boundary surface 54 of the insulating member 13, and the boundary member 52 is disposed between the boundary surface 55 of the insulating member 13 and the boundary surface 56 of the heat transfer member 14. This improves the adhesion between the boundary member 51 and the boundary surface 53 of the electrical connection member 12 and the boundary surface 54 of the insulating member 13, and also improves the adhesion between the boundary member 52 and the boundary surface 55 of the insulating member 13 and the boundary surface 56 of the heat transfer member 14. As a result, the electrical connection member 12, the insulating member 13, and the heat transfer member 14 can increase the actual contact area using the boundary members 51 and 52, thereby reducing the thermal resistance. Therefore, the overall heat transfer coefficient of the system consisting of the electrical connection member 12, the insulating member 13, and the heat transfer member 14 is improved, and the electrical connection member 12 can be efficiently conductively cooled. As a result, concentrated heat input from the electrical connection members to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0036] [F] Sixth embodiment (FIGS. 10 and 11) 10 is a schematic diagram showing the overall configuration of a superconducting coil device according to the sixth embodiment. In the sixth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[0037] The superconducting coil device 60 of the sixth embodiment differs from the first embodiment in that the insulating member 61 is made of a composite insulator that is a combination of one or more elements selected from the following groups: ceramics including elements such as carbides, nitrides, oxides, and borides; and thermosetting resins including elements such as melamine resin, urea resin, epoxy resin, silicone resin, and phenol resin.

[0038] For example, as shown in Fig. 11, the insulating member 61 is configured by dispersing and mixing spherical ceramic powder 62a and rod-shaped ceramic powder 62b in a thermosetting resin 63. The ceramics constituting the insulating member 61 are not limited to the ceramic powders 62a and 62b, and may be a powder in a flake shape or the like, and the average particle size is not limited. In addition, the ceramics constituting the insulating member 61 are preferably SiC, SiO2, Si3N4, Al2O3, or AlN, which have high thermal conductivity.

[0039] As configured as above, the sixth embodiment provides the following effect (8). (8) The insulating member 61 is made of a composite insulator that is made by selecting and combining one or more elements from a group that belongs to ceramics and a group that belongs to thermosetting resins. Since the insulating member 61 contains a thermosetting resin, the insulating member 61 has improved adhesion to the boundary surface between the insulating member 61 and the electrical connection member 12 and the boundary surface between the insulating member 61 and the heat transfer member 14, as in the case of the boundary members 51 and 52 of the fifth embodiment, and the actual contact area can be increased. Furthermore, since the thermosetting resin of the insulating member 61 can be spread thinly before it hardens, the thickness of the insulating member 61 can be reduced.

[0040] As described above, the actual contact area between the electrical connection member 12, the insulating member 61, and the heat transfer member 14 can be increased, and the insulating member 61 can be made thinner, so that the thermal resistance from the heat transfer member 14 to the electrical connection member 12 can be reduced, and the electrical connection member 12 can be efficiently cooled by conduction. As a result, concentrated heat input from the electrical connection member to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0041] [G] Seventh embodiment (FIGS. 12 and 13) 12 is a schematic diagram showing the overall configuration of a superconducting coil device according to the seventh embodiment. In the seventh embodiment, the same parts as those in the first and fifth embodiments are denoted by the same reference numerals as those in the first and fifth embodiments, and the description thereof will be simplified or omitted.

[0042] The seventh embodiment of the superconducting coil device 70 differs from the first embodiment in that, as shown in FIG. 12 , an insulating member 13 is disposed between the electrical connection member 12 and the heat transfer member 14, and compression members 71 are disposed in contact with the respective surfaces of the electrical connection member 12 and the heat transfer member 14 opposite the insulating member 13, and these compression members 71 are fastened and fixed by fastening members 72 consisting of bolts 72a and nuts 72b, thereby mechanically applying a compressive stress to the insulating member 13 via the electrical connection member 12 and the heat transfer member 14.

[0043] The compression member 71 is made of an insulating material such as glass fiber reinforced plastic. Although the fastening member 72 is made of the bolt 72a and the nut 72b, it may be a fastener such as a clamp. When the insulating member 13 is made of a thermosetting resin or the insulating member 61 of the sixth embodiment, the insulating member 13 is provided with a thin thickness by applying a compressive stress by the compression member 71 and the fastening member 72 before solidification.

[0044] 13, the boundary member 51 of the fifth embodiment may be disposed at the boundary between the electrical connection member 12 and the insulating member 13, and the boundary member 52 of the fifth embodiment may be disposed at the boundary between the insulating member 13 and the heat transfer member 14, or either one of these boundary members 51 and 52 may be disposed. The boundary members 51 and 52 disposed in this manner are provided with a thin thickness by applying a compressive stress by the compression member 71 and the fastening member 72, similar to the insulating member 13, and the adhesion between the boundary member 51 and the electrical connection member 12 and the insulating member 13, and between the boundary member 52 and the insulating member 13 and the heat transfer member 14 is improved.

[0045] As configured as above, the seventh embodiment provides the following advantages (9) and (10). (9) The insulating member 13 disposed between the electrical connection member 12 and the heat transfer member 14 is applied with a compressive stress by fastening and fixing the compression members 71, which are disposed on the surfaces of the electrical connection member 12 and the heat transfer member 14 opposite the insulating member 13, with the fastening members 72. This improves the adhesion of the boundary between the electrical connection member 12 and the insulating member 13 and the boundary between the insulating member 13 and the heat transfer member 14, thereby increasing the actual contact area of ​​the electrical connection member 12, the insulating member 13, and the heat transfer member 14. Furthermore, when the insulating member 13 is made of a thermosetting resin, it is provided thin due to the compressive stress.

[0046] For these reasons, the thermal resistance from the heat transfer member 14 to the electrical connection member 14 can be reduced, so that the electrical connection member 12 can be efficiently cooled by conduction. As a result, concentrated heat input from the electrical connection member to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be prevented.

[0047] (10) When the boundary member 51 is disposed between the electrical connection member 12 and the insulating member 13, and the boundary member 52 is disposed between the insulating member 13 and the heat transfer member 14, the compressive stress is applied to the boundary members 51 and 52 by the compression member 71 and the fastening member 72, similarly to the insulating member 13. This improves the adhesion between the boundary member 51 and the electrical connection member 12 and the insulating member 13, and between the boundary member 52 and the insulating member 13 and the heat transfer member 14. This, together with the boundary members 51 and 52 being provided thin, further reduces the thermal resistance from the heat transfer member 14 to the electrical connection member 12, and therefore the electrical connection member 12 can be more efficiently cooled by conduction. As a result, concentrated heat input from the electrical connection members to the superconducting coil 11 can be suppressed, and thermal instability of the superconducting coil 11 can be further prevented.

[0048] Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the gist of the invention, and these substitutions, changes, and combinations are included in the scope and gist of the invention, as well as in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0049] 10...superconducting coil device, 11...superconducting coil, 12...electrical connection member, 13...insulating member, 14...heat transfer member, 15...cooling device, 16...curved surface portion, 20...superconducting coil device, 21, 22, 23, 24...flat portion, 30...superconducting coil device, 31, 32...cutout portion, 40...superconducting coil device, 41, 42...recess, 50...superconducting coil device, 51, 52...boundary member, 53, 54, 55, 56...boundary surface, 60...superconducting coil device, 61...insulating member, 70...superconducting coil device, 71...compression member, 72...fastening member

Claims

1. A plurality of superconducting coils are arranged; a conductive electrical connection member that electrically connects the plurality of superconducting coils; a heat transfer member thermally connected to the electrical connection member via an insulating member; and a cooling device thermally connected to the heat transfer member.

2. 2. The superconducting coil device according to claim 1, characterized in that the electrical connection member has a flat or curved surface portion, and an insulating member thermally connected to the heat transfer member is in surface contact with the flat or curved surface portion.

3. 3. The superconducting coil device according to claim 1, wherein said electrical connection member is provided with a notch, and a heat transfer member is fitted into said notch via an insulating member.

4. 3. The superconducting coil device according to claim 1, wherein the heat transfer member has a recess, and an electrical connection member is fitted into the recess via an insulating member.

5. 5. The superconducting coil device according to claim 1, wherein a boundary member is arranged at at least one of a boundary between the electrical connection member and the insulating member and a boundary between the insulating member and the heat transfer member, the boundary member being in close contact with a boundary surface of the boundary.

6. The superconducting coil device according to any one of claims 1 to 5, characterized in that the insulating member is composed of a composite insulator obtained by selecting and combining one or more elements from each of a group belonging to ceramics and a group belonging to thermosetting resins.

7. the insulating member is disposed between the electrical connection member and the heat transfer member; a compression member is disposed on each of the electrical connection member and the heat transfer member on a side opposite to the insulating member; The superconducting coil device according to any one of claims 1 to 6, characterized in that the compression member is configured to be fastened and fixed by a fastening member, thereby applying a compressive stress to the insulating member via the electrical connection member and the heat transfer member.

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