JP2015222750A - Superconducting magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superconducting magnet that can be reduced in size.SOLUTION: An yoke houses at least a part of a coil and at least a part of a support container 11, respectively. That is, a superconducting magnet 1 houses a part of a coil and support container 11 at the inside of the yoke, and a part of others is set at the outside of the yoke. Thus, the yoke can be reduced in size by the size of the coil and the support container 11 set at the outside. The support container 11 has notches 17A, 17B notched on the outer peripheral side of the coil, at the outside of the yoke. The support container 11 has a structure where the coil can be supported from the outer peripheral side, without having the notches 17A, 17B at the inside of the yoke.

Description

  The present invention relates to a superconducting electromagnet.

  Conventionally, a superconducting electromagnet described in Patent Document 1 is known. The superconducting electromagnet includes an annular coil, a coil frame that houses the coil, a refrigerator that cools the coil, and a yoke (iron core) that surrounds the coil. In this superconducting electromagnet, the load support extends in the radial direction from the wall surface of the yoke disposed on the outer peripheral side of the coil, and the load of the coil is supported by connecting the load support to the coil frame. Yes.

JP 2010-287792 A

  Here, conventionally, it is required to miniaturize the superconducting electromagnet. However, in the above-described superconducting electromagnet, the load support is arranged so as to extend in the radial direction between the coil frame and the yoke. As a result, the load support body projects greatly in the radial direction, which increases the size of the coil and the yoke that accommodates the load support body. As a result, there is a problem that the entire superconducting electromagnet becomes larger.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a superconducting electromagnet that can be reduced in size.

  A superconducting electromagnet according to the present invention includes an annular coil, a support container that covers the coil and extends along the circumferential direction of the coil, and a yoke that houses at least a part of each of the coil and the support container. The support container has a cutout portion cut out on the outer peripheral side of the coil outside the yoke.

  In the superconducting electromagnet according to the present invention, the yoke accommodates at least a part of each of the coil and the support container. That is, the superconducting electromagnet is configured such that a part of the coil and the support container are accommodated inside the yoke, and the other part is exposed outside the yoke. Thus, the yoke can be made smaller by the amount that the coil and the support container are exposed to the outside. Further, outside the yoke, an electromagnetic force is applied to the coil from the outer peripheral side toward the inner peripheral side. Therefore, in this part, since it is not necessary to support the coil from the outer peripheral side, the support container has a cutout part cut out on the outer peripheral side of the coil outside the yoke. In this way, the size of the protruding portion of the support container on the outer peripheral side can be omitted by providing the notch. On the other hand, an electromagnetic force directed from the inner peripheral side to the outer peripheral side of the coil acts inside the yoke. Therefore, in order to prevent the deformation of the coil, it is necessary to support the outer periphery of the coil inside the yoke. The support container has a structure in which the coil can be supported from the outer peripheral side without having a notch inside the yoke. In this way, by supporting the coil from the outer peripheral side with the support container, for example, as compared with the conventional configuration in which the load support for supporting the electromagnetic force of the coil is provided inside the yoke, the yoke is It can suppress overhanging to the outer peripheral side of a coil. As described above, the superconducting electromagnet can be reduced in size.

  The superconducting electromagnet according to the present invention may further include a load support portion connected to the support container outside the yoke. Since the load supporting portion can be disposed outside the yoke, it is possible to suppress the yoke from becoming large. In addition, since the notch is formed in the support container outside the yoke, the amount of protrusion of the support container to the outer peripheral side is smaller than that in the region where the notch is not formed. Since the load support portion is connected to the support container in such a notch formation region, the amount of protrusion of the load support portion to the outer peripheral side can be reduced. As described above, the superconducting electromagnet can be reduced in size.

  In the superconducting electromagnet according to the present invention, the load support portion is connected to the pair of sandwiching portions that sandwich the support container from the axial direction of the coil and the pair of sandwiching portions on the outer peripheral side of the coil, and is connected to the structure. And a support portion. With such a configuration, the amount of protrusion of the load support portion to the outer peripheral side can be reduced by arranging the column portion of the load support portion at a position close to the support container. As described above, the superconducting electromagnet can be reduced in size.

  In the superconducting electromagnet according to the present invention, the support container may have a divided portion that is divided in the circumferential direction, and the divided portion may be provided outside the yoke. With such a structure, by disposing the insulating material in the divided portion, the electric loop of the support container in the circumferential direction can be blocked by the divided portion, and the generation of eddy current can be suppressed. Here, since the strength of the support container is reduced at the divided portion, a connection member is required. However, when the connection member is disposed inside the yoke, the magnetic path of the magnetic circuit becomes longer and the yoke becomes larger. Need arises. On the other hand, by providing the dividing portion of the support container outside the yoke, the connecting member is provided outside the yoke, and the yoke can be prevented from being enlarged.

  The superconducting electromagnet according to the present invention further includes a cooling member that is provided in the support container and cools the coil, and the cooling member has a divided portion that is divided in the circumferential direction. May be provided. With such a structure, by disposing the insulating material in the divided portion, the electric loop of the cooling member in the circumferential direction can be blocked by the divided portion, and the generation of eddy current can be suppressed. In addition, here, since the strength of the cooling member is reduced in the divided portion, a connection member is required. However, when the connection member is disposed inside the yoke, the magnetic path of the magnetic circuit becomes longer by that amount, and the yoke is There is a need to increase it. On the other hand, by providing the cooling member dividing portion outside the yoke, the connecting member is provided outside the yoke, and an increase in size of the yoke can be prevented.

  In the superconducting electromagnet according to the present invention, the cooling member may have a projecting portion that projects to the outer peripheral side of the coil outside the yoke, and the cooling member may be connected to the refrigerator at the projecting portion. With such a configuration, an increase in size of the yoke can be suppressed by arranging the structure for connecting the refrigerator and the cooling member outside the yoke.

  In the superconducting electromagnet according to the present invention, the divided portion of the cooling member may be provided on the opposite side of the protruding portion in the circumferential direction. According to such a structure, it becomes the structure by which the division part used as an insulation location in a cooling member is arrange | positioned on the opposite side of the circumferential direction with respect to the position where a refrigerator is connected. The cooling efficiency of the whole cooling member can be improved by disposing the insulating portion having a high thermal resistance at a position away from the refrigerator.

  According to the present invention, the superconducting electromagnet can be reduced in size.

FIG. 1 is a perspective view showing a magnet device employing a superconducting electromagnet according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a schematic configuration of the superconducting electromagnet shown in FIG. FIG. 3 is a perspective view showing a coil unit of the superconducting electromagnet of the present invention. FIG. 4 is a plan view of the coil unit. FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is an enlarged perspective view of the dividing portion. FIG. 8 is an enlarged perspective view of the dividing portion. FIG. 9 is a schematic plan view of the coil. FIG. 10 is a cross-sectional view for explaining the positional relationship between the divided portion of the cooling member and the divided portion of the support container.

  Hereinafter, an embodiment of a superconducting electromagnet according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a magnet device employing a superconducting electromagnet according to this embodiment. FIG. 2 is a schematic cross-sectional view showing a schematic configuration of the superconducting electromagnet shown in FIG. FIG. 3 is a perspective view showing a coil unit of a superconducting electromagnet. FIG. 4 is a plan view of the coil unit. FIG. 5 is a cross-sectional view taken along line IV-IV in FIG. 6 is a cross-sectional view taken along line VV in FIG. As shown in FIG. 1, the magnet device 100 is configured by arranging a pair of upper and lower superconducting electromagnets 1 so as to face each other and supporting the superconducting electromagnet 1 with a support base 101. The superconducting electromagnet 1 includes a cryostat 3 that is a vacuum container that accommodates the coil unit 2 shown in FIG. 3 and a yoke 4 provided outside the cryostat 3. The cryostat 3 of the upper superconducting electromagnet 1 and the cryostat 3 of the lower superconducting electromagnet 1 are opposed to each other while being reversed upside down, and are connected to each other via the support column 6 so as to be separated from each other. As shown in FIG. 2, the upper cryostat 3 and the lower cryostat 3 are connected by a cryostat connecting member 51. The magnet device 100 functions as a deflection magnet that switches the trajectory of the charged particle beam B passing between the pair of cryostats 3. For example, the magnet device 100 can switch the trajectory of the charged particle beam B emitted from the accelerator between the trajectory T1 and the trajectory T2. Examples of the accelerator that emits the charged particle beam B include a circular accelerator such as a ring cyclotron, an AVF cyclotron, a synchrotron, and a betatron, and a linear accelerator such as a linac.

  The cryostat 3 has a rectangular annular shape. The yoke 4 is configured to accommodate at least a part of the cryostat 3 configured as described above. As shown in FIGS. 1 and 2, specifically, the long side portion of the cryostat 3 is surrounded by the yoke 4, and the short side portion of the cryostat 3 is exposed to the outside from the end face 4 a of the yoke 4. The The yoke 4 enters the wall portion 41 that covers the cryostat 3 from above (below in the case of the lower cryostat 3), the side wall portion 42 that covers the long side portion of the cryostat 3 from the outside, and the hollow portion in the center of the cryostat 3. And a protruding wall portion 43. With the above-described configuration, a part of the cryostat 3 is accommodated inside the yoke 4 and the other part is disposed outside the yoke 4. As a result, the yoke 4 accommodates at least a part of each of the coil 10 and the support container 11 described later. The coil 10 and the other part of the support container 11 are disposed outside the yoke 4.

  As shown in FIG. 3, the superconducting electromagnet 1 includes a coil unit 2 having a coil 10 (see FIG. 5) that generates magnetic flux, a load support portion 7 that supports the load of the coil unit 2, and a coil of the coil unit 2. A refrigerator 8 that cools 10 and a current introduction unit 9 that introduces current into the coil 10 of the coil unit 2 are provided. The coil unit 2 includes an annular coil 10, a support container 11 that covers the coil 10, and a cooling member 15 that cools the coil. The coil unit 2 is formed in an annular shape as a whole corresponding to the shape of the coil 10. The coil unit 2 (that is, the coil 10) according to the present embodiment has a substantially rectangular shape in plan view. The coil unit 2 (coil 10) has at least two different curvatures in the circumferential direction. Specifically, the coil unit 2 includes a maximum curvature portion 2A that faces each other, a curved side portion 2B that faces each other, a corner portion 2C that curves so as to connect the maximum curvature portion 2A and the curved side portion 2B, It has. In the present embodiment, the curvature of the maximum curvature portion 2A is set to infinity, so that the maximum curvature portion 2A extends linearly. However, the maximum curvature portion 2A may be curved so as to have a larger curvature than at least the curved side portion 2B and the corner portion 2C. The shape of the coil unit 2 (coil 10) is not particularly limited, and a D-shaped coil having a substantially D-shape may be employed, a race track coil may be employed, or a square coil may be employed. May be. Alternatively, the coil 10 has a shape like a broad bean (a shape in which an oval shape is generally curved, one long side is curved toward the outer peripheral side, and the other long side is curved toward the inner peripheral side. May be employed. The coil unit 2 (coil 10) may have a shape that is symmetric with respect to the center, or may have a shape that is asymmetric. In the following description, the words “upper” and “lower” are used with reference to the attitude of the superconducting electromagnet 1 in the state shown in FIG. However, the posture of the superconducting electromagnet 1 is not limited to that shown in FIG. 3 and may be changed as appropriate.

  The coil 10 has a configuration in which a superconducting wire is wound. A high temperature superconducting wire may be used as the superconducting wire. For example, Bi2223, Bi2212, Y123, MgB2, an oxide superconductor, or the like may be used as the high-temperature superconducting wire. A low temperature superconducting wire may be used as the superconducting wire. In the present embodiment, two-stage coils 10 are stacked in one coil unit 2.

  The support container 11 is an annular member that covers the coil 10 and extends along the circumferential direction of the coil 10. The support container 11 is made of SUS, aluminum alloy, FRP (fiber reinforced plastic), or the like. The support container 11 is configured to cover the periphery of the coil 10 in a sectional view of one side of the coil 10 (see FIG. 5). The support container 11 includes an end wall portion 12 that covers the coil 10 at one end side (here, the upper end) in the direction (axial direction) in which the central axis CL of the coil 10 shown in FIG. 3 extends, and the other end side (here, the axial direction). An end wall portion 13 that covers the coil 10 at the lower end), an inner peripheral wall portion 14 that covers the coil 10 on the inner peripheral side of the coil 10, and an outer peripheral wall portion 16 that covers the coil 10 on the outer peripheral side of the coil 10. . The end wall portion 12 is an annular plate member that is laminated on one end side in the axial direction with respect to the coil 10 and covers one end face of the coil 10. The end wall portion 13 is an annular plate member that is stacked on the other end side in the axial direction with respect to the coil 10 and covers the other end surface of the coil 10. The inner peripheral wall portion 14 is an annular member disposed on the inner peripheral side of the coil 10 so as to cover the inner peripheral surface of the coil 10. In the present embodiment, the inner peripheral wall portion 14 has a two-stage structure that is laminated between cooling members 15 described later. The outer peripheral wall portion 16 is a member disposed on the outer peripheral side of the coil 10 so as to cover the outer peripheral surface of the coil 10.

  Here, the support container 11 according to the present embodiment has cutout portions 17A and 17B cut out on the outer peripheral side of the coil 10 in a part in the circumferential direction. The notches 17A and 17B are formed by removing the outer peripheral wall 16 and notching the outer peripheral edges of the end walls 12 and 13. In the portion where the notches 17A and 17B are formed, the outer peripheral surface of the coil 10 is exposed from the support container 11 (see particularly FIGS. 3 and 6).

  In the region corresponding to the maximum curvature portion 2 </ b> A in the coil unit 2, the coil 10 is covered with the support container 11 on the outer peripheral side without forming a notch. In a region corresponding to the curved side portion 2B and the corner portion 2C on one end side of the maximum curvature portion 2A, the outer peripheral surface of the coil 10 is exposed by forming the notch portion 17A. In the region corresponding to the curved side portion 2B and the corner portion 2C on the other end side of the maximum curvature portion 2A, the outer peripheral surface of the coil 10 is exposed by forming the notch portion 17B.

  As shown in FIG. 4, a region of the coil unit 2 in which the cutout portion 17A is formed in the circumferential direction is referred to as a cutout portion formation region GE1. Of the coil unit 2, a region where the notch 17 </ b> B is formed in the circumferential direction is referred to as a notch forming region GE <b> 2. In the coil unit 2, regions where the notches 17 </ b> A and 17 </ b> B are not formed in the circumferential direction and the strength on the outer peripheral side of the support container 11 is ensured are referred to as reinforcement regions RE <b> 1 and RE <b> 2. In the present embodiment, the curved side 2B and the corner 2C correspond to the notch formation regions GE1 and GE2, and the maximum curvature 2A corresponds to the reinforcement regions RE1 and RE2. As shown in FIG. 1, in the coil unit 2, the reinforcement regions RE <b> 1 and RE <b> 2 are configured to be surrounded by the yoke 4, and the notch formation regions GE <b> 1 and GE <b> 2 are configured to be disposed outside the yoke 4. Is done. Therefore, in the coil unit 2 (that is, the coil 10 and the support container 11), a portion corresponding to the maximum curvature portion 2A is accommodated in the yoke 4, and portions corresponding to the curved side portion 2B and the corner portion 2C are included in the yoke 4. Located outside. In the present embodiment, the notch formation regions GE1 and GE2 are regions corresponding to the outside of the yoke 4, and the reinforcing regions RE1 and RE2 are regions corresponding to the inside of the yoke 4. . As shown in FIG. 9 (details will be described later), in a region corresponding to the inside of the yoke 4, an electromagnetic force F1 from the inner peripheral side to the outer peripheral side of the coil 10 acts, and the reinforcing regions RE1 and RE2 are arranged in the region. The In a region corresponding to the outside of the yoke 4, an electromagnetic force F <b> 2 is applied to the coil 10 from the outer peripheral side to the inner peripheral side, and the notch formation regions GE <b> 1 and GE <b> 2 are disposed in the region.

  In addition, the support container 11 does not need to be notched in the notches 17A and 17B until the coil 10 is completely exposed. The end surface on the outer peripheral side of the support container 11 in the notch formation regions GE1 and GE2 is at least the inner peripheral side from the end surface on the outer peripheral side of the support container 11 in the reinforcement regions RE1 and RE2 (that is, the end surface on the outer peripheral side of the outer peripheral wall portion 16). It suffices if they are arranged.

  The cooling member 15 is a member connected to the refrigerator 8 and is a member that cools the coil 10 by heat transfer from the refrigerator 8. The cooling member 15 is made of copper, aluminum, a copper alloy (such as brass or phosphor bronze), an aluminum alloy, or the like, which is a good heat conductive metal. The cooling member 15 is provided in the support container 11. The cooling member 15 is an annular plate member in which a plurality (three in this case) are laminated so as to sandwich each coil 10 from both sides in the axial direction. As shown in FIGS. 5 and 6, in the present embodiment, the end wall portion 12, the cooling member 15, the coil 10, and the cooling member 15 of the support container 11 are directed from one side (upper side) to the other side (lower side) in the axial direction. The coil 10, the cooling member 15, and the end wall portion 13 of the support container 11 are stacked in this order. The edge on the inner peripheral side of the cooling member 15 extends to the inner peripheral side from the coil 10 and is exposed from the inner peripheral surface of the support container 11. Further, the inner peripheral wall portion 14 of the support container 11 is disposed so as to be sandwiched between the inner peripheral edge portions of the cooling member 15.

  Next, the divided structure of the support container 11 and the cooling member 15 will be described. 7 and 8 are enlarged perspective views of the dividing portion.

  The support container 11 includes divided portions 18A and 18B that are divided in the circumferential direction. The division part 18A is provided in the notch part formation region GE1. The division part 18B is provided in the notch part formation region GE2. In the present embodiment, the divided portions 18A and 18B are formed at the center position in the circumferential direction of the curved side portion 2B. As shown in FIG. 7, the divided portion 18 </ b> A is configured by providing slits extending from the inner peripheral side toward the outer peripheral side with respect to the end wall portions 12 and 13 of the support container 11. In the slit, one cut surface and the other cut surface of the end wall portions 12 and 13 are spaced apart from each other in the circumferential direction. In the dividing portion 18A, the insulating material 31 is disposed in the slit. As the insulating material 31, plastic, FRP, ceramic (alumina or the like), polyimide, polycarbonate, or the like is employed. As a result, the electrical loops of the end wall portions 12 and 13 are cut at the dividing portion 18A. The positions of the slit of the end wall portion 12 and the slit of the end wall portion 13 in the circumferential direction are the same. In the dividing portion 18A, the divided one end wall portions 12 and 13 and the other end wall portions 12 and 13 are connected by a connecting member 33 arranged across the slit. Note that the end wall portions 12 and 13 and the connecting member 33 are prevented from flowing through the one end wall portions 12 and 13 through the connecting member 33 to the other end wall portions 12 and 13. The space is insulated by interposing an insulating material. In the figure, the gray scaled portion indicates an insulating material. The connecting member 33 is connected to the end wall portions 12 and 13 by bolt fastening or the like. Also in the dividing portion 18B, the support container 11 is divided by the same dividing structure as that of the dividing portion 18A. However, in the dividing portion 18B, the end wall portions 12 and 13 are not electrically divided because a conductive material is disposed in the slit instead of an insulating material.

  The cooling member 15 has division parts 21A and 21B divided in the circumferential direction. The division part 21A is provided in the notch part formation region GE1. The division part 21B is provided in the notch part formation region GE2. In the present embodiment, the divided portions 21A and 21B are formed at the center position in the circumferential direction of the curved side portion 2B. That is, the divided portions 21A and 21B are disposed at the same position in the circumferential direction as the divided portions 18A and 18B of the support container 11. As shown in FIG. 7, the dividing portion 21 </ b> A is configured by providing each cooling member 15 with a slit extending from the inner peripheral side toward the outer peripheral side. In the slit, one cut surface of the cooling member 15 and the other cut surface are opposed to each other in the circumferential direction. In the dividing portion 21A, the insulating material 31 is disposed in the slit. As the insulating material 31, plastic, FRP, ceramic (alumina or the like), polyimide, polycarbonate, or the like is employed. As a result, the electric loop of the cooling member 15 is cut at the dividing portion 21A. The positions of the slits of the cooling members 15 in the circumferential direction are the same. Further, the position of the slit provided in the cooling member 15 (that is, the position of the dividing portion 21A) is the same as the position of the slit provided in the support container 11 (ie, the position of the dividing portion 18A). Note that “same” here does not require the positions and sizes of the slits to be completely the same, and the insulating material 31 of the slit of the support container 11 and the insulating material of the slit of the cooling member 15 in plan view. What is necessary is just to arrange | position in the position close | similar to the extent which 31 overlaps at least partially.

  The cooling member 15 has an overhanging portion 22 that protrudes to the outer peripheral side of the coil 10 at the position of the dividing portion 21A (that is, the notch portion forming region GE1). The overhanging portion 22 is formed on both one of the divided cooling members 15 and the other cooling member 15. The overhang portion 22 is provided so as to extend a predetermined distance along the circumferential direction from the position of the dividing portion 21A. The overhanging portion 22 of the uppermost cooling member 15, the overhanging portion 22 of the middle cooling member 15, and the overhanging portion 22 of the lowermost cooling member 15 are connected to each other by a column 25 extending in the vertical direction.

  The overhang portion 22 has a bent portion 23 that is bent so as to extend in the axial direction of the coil 10 at the position of the divided portion 21A. As shown in FIG. 8, the overhang portion 22 of the uppermost cooling member 15 is provided with a bent portion 23 that is bent so as to extend upward. A bent portion 23 that is bent so as to extend downward is provided on the overhang portion 22 of the cooling member 15 at the lowest stage. The middle cooling member 15 is not provided with the bent portion 23. The bent portion 23 of the one cooling member 15 and the bent portion 23 of the other cooling member 15 face each other in the circumferential direction at the position of the divided portion 21A. A sheet-like insulating material 32 is disposed between the pair of opposing bent portions 23. As the insulating material 32, plastic, FRP, ceramic (alumina or the like), polyimide, polycarbonate or the like is employed. The pair of bent portions 23 are connected to each other by bolt fastening or the like.

  Also in the division part 21B, the cooling member 15 is divided by the same division structure as the division part 21A. However, in the divided portion 21B, a conductive material, not an insulating material, is disposed in the slit, and a conductive material, not an insulating material, is disposed between the bent portions 23. Therefore, the cooling member 15 is electrically divided. It has not been. Further, the extending portion 22 </ b> A of one cooling member 15 divided by the dividing portion 21 has a longer extension distance in the circumferential direction than the other extending portion 22. This overhanging portion 22 </ b> A functions as a connection portion with the refrigerator 8. Therefore, the cooling member 15 is connected to the refrigerator 8 at the overhanging portion 22A.

  In contrast to the coil unit 2 configured as described above, the refrigerator 8 and the current introduction unit 9 are connected to the coil unit 2 in the notch formation region GE2. In the present embodiment, the refrigerator 8 and the current introduction part 9 are arranged at positions corresponding to the outer peripheral side of the curved side part 2B in the notch part formation region GE2.

  The refrigerator 8 is thermally connected to the cooling member 15 via the heat transfer connection portion 26 in the notch portion formation region GE2. The heat transfer connection portion 26 is connected to an overhang portion 22A (see FIG. 4) that protrudes to the outer peripheral side in the vicinity of the division portion 21B. In the present embodiment, one refrigerator 8 is provided for the coil unit 2. Of the divided portions of the cooling member 15, the divided portion 21 </ b> A related to the insulating portion is provided on the opposite side of the protruding portion 22 </ b> A to which the refrigerator 8 is connected in the circumferential direction. That is, the dividing portion 21A related to the insulating portion is formed on the opposite side of the refrigerator 8 with the central axis CL interposed therebetween. Here, the dividing portion 21B formed on the refrigerator 8 side is not an insulating material having a large thermal resistance but a conductive material having a small thermal resistance. Therefore, even if there is only one refrigerator 8, the entire coil unit 2 can be satisfactorily cooled without being hindered by the dividing portion 21 </ b> B.

  The current introduction part 9 is electrically connected to the coil 10 via the conductive connection part 27 in the notch part formation region GE2. In the present embodiment, one current introduction portion 9 is provided for the coil unit 2. Further, among the divided portions of the support container 11, the divided portion 18 </ b> A related to the insulating portion is provided on the opposite side of the current introduction portion 9 in the circumferential direction. That is, the divided portions 18 </ b> A and 21 </ b> A related to the insulating portions are formed on the opposite side of the current introduction portion 9 with the central axis CL interposed therebetween.

  The load support portion 7 is connected to the support container 11 in the notch portion formation regions GE1 and GE2. In this embodiment, the load support part 7 is provided in the corner | angular part 2C of the four corners of the coil unit 2 among the notch part formation area GE1, GE2. The load support portion 7 is connected to the pair of sandwiching portions 36 that sandwich the support container 11 from the axial direction of the coil 10, and to the pair of sandwiching portions 36 on the outer peripheral side of the coil 10, and to the column portion 37 that is connected to the yoke 4. And. The clamping portion 36 disposed on the upper side is in contact with the upper surface of the end wall portion 12 of the support container 11 and is connected to the end wall portion 12 by bolt fastening or the like. The holding portion 36 disposed on the lower side is in contact with the lower surface of the end wall portion 13 of the support container 11 and is connected to the end wall portion 13 by bolt fastening or the like. Moreover, a part of each clamping part 36 is extended toward the outer peripheral side rather than the end wall parts 12 and 13. FIG. The column portion 37 extends in the vertical direction at a position on the outer peripheral side of the coil unit 2 and is connected to the pair of clamping portions 36. Further, the support column 37 extends upward from the upper clamping unit 36 and is connected to the structure 40. In addition, the structure 40 which is a connection target object of the support | pillar part 37 will not be specifically limited if it can receive a load, However, The wall surface etc. of the cryostat 3 may be sufficient. The column portion 37 extends below the lower clamping portion 36 and is connected to a structure such as a wall surface of the cryostat 3.

  As described above, the divided portions 18A and 18B, the divided portions 21A and 21B, and the overhang portion 22 are provided in the notch portion formation regions GE1 and GE2, and the load support portion 7, the overhang portion 22, the refrigerator 8, and the current The introduction part 9 is connected to the coil unit 2 at the notch part formation regions GE1, GE2. That is, the divided portions 18 </ b> A and 18 </ b> B and the divided portions 21 </ b> A and 21 </ b> B are provided outside the yoke 4, and the overhanging portion 22 projects to the outer peripheral side outside the yoke 4. In addition, the load support portion 7, the overhang portion 22, the refrigerator 8, and the current introduction portion 9 are connected to the coil unit 2 outside the yoke 4.

  Next, the operation and effect of the superconducting electromagnet 1 according to this embodiment will be described.

  In the superconducting electromagnet 1 according to the present embodiment, the yoke 4 accommodates at least a part of each of the coil 10 and the support container 11. That is, the superconducting electromagnet 1 is configured such that a part of the coil 10 and the support container 11 is accommodated inside the yoke 4 and the other part is exposed outside the yoke 4. Thus, the yoke 4 can be made smaller by the amount that the coil 10 and the support container 11 are exposed to the outside. As shown in FIG. 9, an electromagnetic force F <b> 2 that works from the outer peripheral side to the inner peripheral side acts on the coil 10 outside the yoke 4. Therefore, since it is not necessary to support the coil 10 from the outer peripheral side in this portion, the support container 11 has notches 17A and 17B cut out on the outer peripheral side of the coil outside the yoke 4. Thus, the size of the protrusion of the support container to the outer peripheral side can be omitted by providing the notches 17A and 17B. On the other hand, an electromagnetic force F <b> 1 acting from the inner peripheral side to the outer peripheral side of the coil 10 works inside the yoke 4. Therefore, in order to prevent the deformation of the coil 10, it is necessary to support the outer side of the coil 10 inside the yoke 4. The support container 11 has a structure capable of supporting the coil 10 from the outer peripheral side without having the notches 17A and 17B inside the yoke 4. In this way, by supporting the coil from the outer peripheral side with the support container 11, for example, as in the prior art, a (rod-shaped) load support for supporting the electromagnetic force of the coil 10 is provided inside the yoke. In comparison, the yoke 4 can be prevented from protruding to the outer peripheral side of the coil 10. As described above, the superconducting electromagnet 1 can be reduced in size.

  The superconducting electromagnet 1 according to this embodiment further includes a load support portion 7 connected to the support container 11 outside the yoke 4. Since the load support portion 7 can be disposed outside the yoke 4, it is possible to suppress the yoke 4 from becoming large. Further, in the notch portion forming regions GE1 and GE2 outside the yoke 4, the notch portions 17A and 17B are formed in the support container 11 and compared with the reinforcing regions RE1 and RE2 in which the notches 17A and 17B are not formed. Thus, the amount of protrusion of the support container 11 to the outer peripheral side is small. Since the load support portion 7 is connected to the support container 11 in the notch formation regions GE1 and GE2, the amount of the load support portion 7 projecting to the outer peripheral side can be reduced. As described above, the superconducting electromagnet 1 can be reduced in size.

  In the superconducting electromagnet 1 according to the present embodiment, the load support portion 7 is connected to a pair of sandwiching portions 36 that sandwich the support container 11 from the axial direction of the coil 10 and a pair of sandwiching portions 36 on the outer peripheral side of the coil 10. In addition, a column portion 37 connected to the structure 40 is provided. With such a configuration, the protruding portion 37 of the load support portion 7 can be reduced by arranging the column portion 37 of the load support portion 7 at a position close to the support container 11. For example, as shown in FIG. 6, by adjusting the position of the column portion 37 so that the dimension L between the column portion 37 and the outer peripheral surface of the coil 10 is as small as possible, The amount of overhanging can be suppressed. In addition, when the load support part 7 is arrange | positioned in reinforcement area | region RE1, RE2, it is necessary to arrange | position the support | pillar part 37 to the outer peripheral side rather than the outer peripheral wall part 16 of the support container 11. FIG. Therefore, the amount of overhang of the load support portion 7 is increased by disposing the support column portion 37 on the outer peripheral side by the thickness of the outer peripheral wall portion 16. As described above, according to this embodiment, the superconducting electromagnet 1 can be downsized.

  In the superconducting electromagnet 1 according to the present embodiment, the support container 11 includes divided portions 18A and 18B that are divided in the circumferential direction, and the divided portions 18A and 18B are notched portion forming regions GE1, which are outside the yoke 4. It is provided in GE2. With such a structure, by disposing the insulating material 31 in the divided portion 18A, the electrical loop of the support container 11 in the circumferential direction can be blocked by the divided portion 18A, and the generation of eddy currents can be suppressed. it can. Here, since the strength of the support container 11 is reduced in the divided portions 18A and 18B, a connection member is required. However, when the connection member is disposed inside the yoke 4, the magnetic path of the magnetic circuit becomes longer correspondingly. The yoke 4 needs to be enlarged. On the other hand, by providing the divided portions 18A and 18B of the support container 11 outside the yoke 4, the connection member is provided outside the yoke 4, and the yoke 4 can be prevented from being enlarged.

  The superconducting electromagnet 1 according to the present embodiment further includes a cooling member 15 that is provided in the support container 11 and cools the coil 10. The cooling member 15 includes divided portions 21A and 21B that are divided in the circumferential direction, and the divided portions 21A and 21B are provided in the notch forming regions GE1 and GE2 that are outside the yoke 4. With such a structure, by disposing the insulating material 31 in the divided portion 21A, the electric loop of the cooling member 15 in the circumferential direction can be blocked by the divided portion 21A, and the generation of eddy current can be suppressed. it can. Here, since the strength of the cooling member 15 is lowered in the divided portions 21A and 21B, a connection member is required. However, when the connection member is disposed inside the yoke 4, the magnetic path of the magnetic circuit becomes longer correspondingly. The yoke 4 needs to be enlarged. On the other hand, by providing the divided portions 21A and 21B outside the yoke, the connecting member is provided outside the yoke, and the yoke can be prevented from being enlarged. Further, by providing the divided portions 21A and 21B of the cooling member 15 in the notch portion forming regions GE1 and GE2, the following effects can be obtained. Since the insulating material 31 has poor thermal conductivity (lower than the cooling member 15), there is a risk that a temperature difference will occur in the divided portion 21A of the cooling member 15. In order to prevent this, a method of increasing the heat transfer area, that is, a method of increasing the cooling member 15 and the insulating material 31, can be considered. In this case, the yoke 4 also needs to be increased. Therefore, by providing the dividing portion 21A outside the yoke 4, it is possible to prevent the yoke 4 from becoming large and to suppress the occurrence of a temperature difference in the dividing portion 21A.

  In the superconducting electromagnet 1 according to the present embodiment, the cooling member 15 has an overhang portion 22 that protrudes to the outer peripheral side of the coil 10 in the notch portion formation regions GE1 and GE2, and the cooling member 15 is formed in the overhang portion 22. The refrigerator 8 is connected. With such a configuration, the structure for connecting the refrigerator 8 and the cooling member 15 can be prevented from projecting to the outer peripheral side.

  In the superconducting electromagnet 1 according to the present embodiment, the divided portion 21A of the cooling member 15 related to the insulating portion is provided on the opposite side of the protruding portion 22A to which the refrigerator 8 is connected in the circumferential direction. According to such a structure, it becomes the structure by which the division part 21A used as the insulation location in the cooling member 15 is arrange | positioned on the opposite side of the circumferential direction with respect to the position where the refrigerator 8 is connected. The cooling efficiency of the whole cooling member 15 can be improved by disposing an insulating portion having a high thermal resistance at a position away from the refrigerator 8.

  The present invention is not limited to the embodiment described above.

  For example, in the above-described embodiment, the divided portions 21A and 21B of the cooling member 15 and the divided portions 18A and 18B of the support container 11 are arranged at the same position in the circumferential direction. That is, the insulating part of the cooling member 15 and the insulating part of the support container 11 are arranged at the same position in the circumferential direction. It may replace with this and may arrange | position the insulation location (namely, division | segmentation part) of the cooling member 15 and the insulation location (namely, division | segmentation part) of the support container 11 in a different position in the circumferential direction. However, in this case, as shown in FIG. 10B, the cooling member 15 and the support container 11 are formed so that an electrical loop (indicated by LP in the figure) is not formed between the support container 11 and the cooling member 15. An insulating material 31 and a high resistance material are disposed between the two. On the other hand, as shown in FIG. 10A, when the insulation location of the cooling member 15 and the insulation location of the support container 11 (end wall portion 12) are the same, the electrical location as shown in FIG. Since a loop is not formed, it is not necessary to arrange an insulating material between the cooling member 15 and the support container 11.

  In the above-described embodiment, the configuration including the sandwiching portion 36 and the support column portion 37 is exemplified as the load support portion, but the configuration of the load support portion is not particularly limited. For example, a strap-type load support may be employed. In addition, when employ | adopting a support | pillar as a load support part, you may make it connect not only with both the upper wall part and lower wall part of a cryostat, but with only one of the wall parts. Further, the load support portion may be provided so as to extend in a direction inclined with respect to the central axis of the coil, instead of extending the load support portion in a direction along the central axis of the coil.

  Further, the position at which the notch is formed is not particularly limited, and may be provided at any position of the support container. Further, the number of the divided parts of the cooling member and the divided parts of the support container are not limited. In addition, it is not necessary to provide the division part of a cooling member, and it is not necessary to provide the division part of a support container. Moreover, in the above-mentioned embodiment, although the insulation location of the cooling member and the support container was one place, you may provide two or more places.

  In the above-described embodiment, the magnet device that deflects the trajectory of the charged particle beam is exemplified as the device using the superconducting electromagnet. However, the application of the superconducting electromagnet is not limited and may be used for other applications.

  DESCRIPTION OF SYMBOLS 1 ... Superconducting electromagnet, 4 ... Yoke, 7 ... Load support part, 8 ... Refrigerator, 9 ... Current introduction part, 10 ... Coil, 11 ... Support container, 15 ... Cooling member, 17A, 17B ... Notch part, 18A, 18B: Dividing part, 21A, 21B ... Dividing part, 22A ... Overhanging part, 36 ... Clamping part, 37 ... Strut part, 40 ... Structure, GE1, GE2 ... Notch forming region.

Claims (7)

An annular coil;
A support container covering the coil and extending along a circumferential direction of the coil;
A yoke for accommodating at least a part of each of the coil and the support container,
The support container is a superconducting electromagnet having a cutout portion cut out on the outer peripheral side of the coil outside the yoke.   The superconducting electromagnet according to claim 1, further comprising a load support portion connected to the support container outside the yoke. The load supporting portion is
A pair of clamping parts that sandwich the support container from the axial direction of the coil;
The superconducting electromagnet according to claim 2, further comprising: a support portion connected to the structure body and connected to the pair of sandwiching portions on the outer peripheral side of the coil. The support container has a divided portion that is divided in the circumferential direction,
The superconducting electromagnet according to any one of claims 1 to 3, wherein the dividing portion is provided outside the yoke. A cooling member provided in the support container for cooling the coil;
The cooling member has a divided portion that is divided in the circumferential direction,
The superconducting electromagnet according to claim 1, wherein the divided portion is provided outside the yoke. The cooling member has a projecting portion that projects to the outer peripheral side of the coil outside the yoke,
The superconducting electromagnet according to claim 5, wherein the cooling member is connected to a refrigerator at the projecting portion.   The superconducting electromagnet according to claim 6, wherein the divided portion of the cooling member is provided on the opposite side of the protruding portion in the circumferential direction.