JP2020194882A - Superconducting magnet device - Google Patents

Abstract

To provide a superconducting magnet device having a structure in which, even when there are many connecting portions of a superconducting wire, the arrangement can be easily performed and the superconducting wire can be easily routed.SOLUTION: A superconducting magnet device includes a first wiring holding portion (cylindrical body 16) extending from a winding frame 6 in the axial direction of a superconducting coil 1, and a plurality of wiring second holding portions (joint plate 17) arranged on the same side as the cylindrical body 16 in the axial direction, extending in a direction intersecting the axial direction, and having a diameter larger than that of the winding frame 6 and the cylindrical body 16. The joint plate 17 is provided with an adjusting mechanism 23 for adjusting the length of an arrangement path of lead wires 7a to 15a (superconducting wire) from the superconducting coil 1, and a box-shaped body 26 for storing the connection portion of the superconducting wire. The superconducting wire is spirally wound around the first wiring holding portion.SELECTED DRAWING: Figure 4

Description

The present invention relates to a superconducting magnet device.

Non-Patent Document 1 below discloses a technique for routing a terminal wire (leading wire) drawn from a superconducting coil (winding portion of a superconducting wire material). In Non-Patent Document 1, the terminal wire drawn from the superconducting coil is routed upward by edgewise bending and connected in the space above the terminal wire.

Yoshinori Yanagisawa, 4 outsiders, "Permanent current NMR with superconducting junctions of high-temperature superconducting wires", [online], November 2, 2018, press release material, [search on February 4, 2019], Internet (URL) : Http://www.riken.jp/pr/press/2018/20181102_1/)

In the above-mentioned routing technique of the terminal wire drawn from the superconducting coil, the space where the connection portion of the terminal wire can be arranged is small, and it is difficult to arrange the connection portion when the number of connection portions increases. Further, in the tape-shaped superconducting wire material, there is a problem that the routing work becomes complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is that even if there are many connecting portions of the superconducting wire, the arrangement can be easily performed and the superconducting wire can be easily routed. It is to provide a superconducting magnet device having a structure capable of capable.

The present invention is arranged on the same side as the superconducting coil, the wiring first holding portion extending from the winding frame of the superconducting coil toward the axial direction of the superconducting coil, and the wiring first holding portion in the axial direction. A plurality of wiring second holding portions, which extend in a direction intersecting the axial direction and have a diameter larger than that of the winding frame and the wiring first holding portion. , A superconducting magnet device. The second wiring holding portion has an adjusting mechanism for adjusting the length of the arrangement path of the superconducting wires extending from the superconducting coil and being connected to each other, and a box shape for storing the connecting portion of the superconducting wires. The body is provided. The wiring is in a state in which the superconducting wire is spirally wound around the first holding portion of the wiring, the length of the arrangement path is adjusted by the adjusting mechanism, and the connecting portion is stored in the box-shaped body. It is fixed to the second holding part.

According to the present invention, it is possible to consolidate a plurality of connecting portions of the superconducting wire material into the wiring second holding portion. Therefore, even if there are many connecting portions of the superconducting wire, the arrangement can be easily performed. Further, since the superconducting wire can be spirally wound around the first wiring holding portion to perform the routing work, the work is easy.

It is sectional drawing of the superconducting coil constituting the superconducting magnet device which concerns on one Embodiment of this invention. It is a schematic diagram which shows the holding structure of the superconducting wire material (leading wire) extending from the superconducting coil of the innermost layer among the plurality of superconducting coils shown in FIG. It is a circuit diagram which shows the permanent current loop part of the superconducting coil of the innermost layer among the plurality of superconducting coils shown in FIG. It is a perspective view which shows a part of the holding structure shown in FIG. 2 concretely. It is a top view which shows the lower surface of the joint plate as the wiring 2nd holding part shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

1 to 5 are views for explaining a superconducting magnet device according to an embodiment of the present invention. In addition, in FIGS. 1 to 5, the corresponding members and parts are designated by the same reference numerals.

As shown in FIG. 1, the superconducting magnet devices are arranged in order from the inside, the first superconducting coil 1, the second superconducting coil 2, the third superconducting coil 3, the fourth superconducting coil 4, and the axial direction. A plurality of fifth superconducting coils 5 are provided. The plurality of fifth superconducting coils 5 are correction coils for correcting the generated magnetic field. These superconducting coils 1 to 5 are housed in a low-temperature container (not shown) called a cryostat, and are cooled by liquid helium or the like.

The superconducting wire constituting the first superconducting coil 1 is a tape-shaped wire, for example, a Y-based superconducting wire which is one of the high-temperature superconducting wires. As shown in FIG. 2, the first superconducting coil 1 is formed by winding the superconducting wire around the body 6a of the winding frame 6, and as shown in FIG. 3, a plurality of superconducting wires 7 to 15 are wound. Is connected. Further, the superconducting wires 7 and 15 at both ends of the plurality of superconducting wires 7 to 15 are connected to the lead wires 21 and 22 (= superconducting wires extending from the permanent current switch 20) from the permanent current switch 20, respectively. The lead wires 21 and 22 are also, for example, Y-based superconducting wires. Reference numerals J1 to J10 are attached to each connection portion of the superconducting wire members 7 to 15, 21 and 22. The first superconducting coil 1 (superconducting coil) is not limited to the one in which nine superconducting wires 7 to 15 are connected as in the present embodiment, and constitutes the first superconducting coil 1 (superconducting coil). The number of superconducting wires to be used varies.

Here, as a method of connecting superconducting wires 7 to 15, 21, 22 such as Y-based superconducting wires with a low resistance of 10 ^-11 Ω or less, there is a method of connecting the superconducting wires by heat treatment such as sintering. .. Since heat treatment between superconducting wires requires, for example, a temperature of about 800 ° C., it is necessary to draw the two connected superconducting wires into a heating furnace. In this case, since the entire first superconducting coil 1 cannot be put into the heating furnace, the lead wires 7a to 15a (= superconducting wire material extending from the superconducting coil) from the first superconducting coil 1 are put into the heating furnace, and the connection points are connected. It will be connected by heat treatment. If the required performance is not obtained after the superconducting wires are heat-treated and connected to each other, the heat-treated connection portion is cut and the vicinity portion is heat-treated and connected again, or the heat-treated connection portion is not cut and the vicinity portion thereof is not cut. Will be heat-treated and connected again. Therefore, when connecting the superconducting wires 7 to 15, 21, and 22 with low resistance, it is necessary to secure a sufficient extra length in consideration of the possibility of redoing.

A partial structure of the superconducting magnet device is schematically shown in FIG. Further, FIG. 4 is a diagram specifically showing a part of the structure shown in FIG.
The superconducting magnet device of the present embodiment includes two tubular bodies 16 and 18 as wiring first holding portions extending from the winding frame 6 in the axial direction of the first superconducting coil 1. Joint plates 17 and 19 as second wiring holding portions are connected to the ends of these tubular bodies 16 and 18 on the opposite side of the winding frame 6. The disk-shaped joint plates 17 and 19 have a diameter larger than that of the winding frame 6 and the tubular body 12, and extend from the tubular bodies 16 and 18 in a direction intersecting the axial direction of the first superconducting coil 1. Will be done. The two joint plates 17 and 19 are arranged at predetermined intervals in the axial direction of the first superconducting coil 1.

The tubular bodies 16 and 18 and the joint plates 17 and 19 are cooled with a refrigerant such as liquid helium so that the lead wires 7a to 15a, 21 and 22 (superconducting wires) maintain the superconducting state.

In the present embodiment, the joint plates 17 and 19 are orthogonal to the tubular bodies 16 and 18, but they do not necessarily have to be orthogonal to each other. Further, the winding frame 6 and the tubular body 16 may be separate parts and may be connected to each other, or may be an integrated product formed of one material. Further, although the joint plate 19 is connected to the tubular body 18 extending from the winding frame 6, the joint plate 19 is not provided and the joint plate 19 is joined at a predetermined interval by using a fixing means such as a bolt. The joint plate 19 may be connected to the plate 17. In this case, the plurality of lead wires 7a to 15a are all wound around the tubular body 16. Further, the number of joint plates is not limited to two, and three or more joint plates may be arranged on the same side as the tubular body (wiring first holding portion) in the axial direction of the superconducting coil.

FIG. 5 is a plan view showing the lower surface of the joint plate 17 shown in FIG. Note that FIG. 5 shows the lead wires 7a to 11a and 15a from the first superconducting coil 1 and the lead wires 21 and 22 from the permanent current switch 20, but the lower surface of the joint plate 17 shown in FIG. Since the display becomes complicated, the illustration of these leader lines is omitted.

As shown in FIGS. 4 and 5, on the lower surface of the joint plate 17, the lead wires 7a to 11a and 15a extending from the first superconducting coil 1 and being interconnected with each other, and the lead wires 21 and 22 from the permanent current switch 20 A plurality of adjusting mechanisms 23 for adjusting the length of the arrangement path of the above are provided. Further, on the lower surface of the joint plate 17, a plurality of box-shaped bodies 26 for storing the connection portions J1 to J5 and J10 of the lead wires 7a to 11a, 15a, 21 and 22 are provided. Leader wires other than the above, such as the leader wire 12a, are arranged on the lower surface of the joint plate 19, and connection portions other than the above, such as the connection portion J6, are stored in a box-shaped body provided on the lower surface of the joint plate 19.

Since the configuration of the lower surface of the joint plate 17 and the configuration of the lower surface of the joint plate 19 are similar configurations, the configuration of the lower surface of the joint plate 17 will be described as a representative with reference to FIGS. 4 and 5. The adjusting mechanism 23, the box-shaped body 26, and the like may be provided on the upper surfaces of the joint plates 17 and 19.

A plurality of rod-shaped guide members 25 serving as guides for the lead wires 7a to 11a and 15a are radially attached to the joint plate 17 as a set of two. The end of the guide member 25 is a curved surface 25a in order to suppress deterioration of the superconducting wire due to bending of the wire.

The adjusting mechanism 23 has a plurality of disc-shaped plate-shaped bodies 23a to 23c around which a lead wire (superconducting wire material) is hung. The plate-shaped bodies 23a to 23c are alternately attached to the joint plates 17. The plate-shaped body 23b of the plate-shaped bodies 23a to 23c is slidable with respect to the joint plate 17. The joint plate 17 is provided with a long groove 24 that serves as a guide for sliding the plate-shaped body 23b, and the locking member 30 provided at the center of the plate-shaped body 23b slides and moves in the long groove 24. .. In addition to the plate-shaped bodies 23a to 23c, a plate-shaped body 27 attached to the joint plate 17 is also used in the same manner as these plate-shaped bodies 23a to 23c for routing the lead wires 21 and 22 from the permanent current switch 20. Be done.

As shown in FIG. 4, the box-shaped body 26 is, for example, a rod-shaped member having a U-shaped cross section.

The joint plate 17 is provided with an embedding portion 28 (embedding hole) for embedding the permanent current switch 20. According to the holding structure of the permanent current switch 20 in which the permanent current switch 20 is embedded in the embedded portion 28 (embedded hole), the protruding height of the permanent current switch 20 from the lower surface of the joint plate 17 can be adjusted, and the permanent current switch 20 can be adjusted. The height of protrusion of the lead wires 21 and 22 from the lower surface of the joint plate 17 can be adjusted. Further, the thickness of the permanent current switch 20 can be easily changed. The permanent current switch 20 is fixed to the joint plate 17 by the locking member 29.

The procedure for routing and storing the lead wires 7a to 11a and 15a from the first superconducting coil 1 and the lead wires 21 and 22 from the permanent current switch 20 is as follows, for example.

The lead wires 7a to 11a and 15a are spirally wound around the outer peripheral surface of the tubular body 16 from the winding frame 6 to the lower surface height level of the joint plate 17. Then, the end of the lead wire 7a and the end of the lead wire 8a, the end of the lead wire 7a and the end of the lead wire 21, and so on, the lead wires 7a to 11a, 15a and the permanent current switch 20 of the extra length portion. The lead wires 21 and 22 from the above are appropriately placed in a heating furnace and connected by heat treatment. Then, the characteristics of the connecting portions J1 to J5 and J10 connected by heat treatment are evaluated, and if the required performance is not obtained, the heat treatment connection is repeated until the required performance is obtained. In this case, the heat treatment connection portion may be cut and the vicinity portion thereof may be heat-treated and connected again, or the vicinity portion may be heat-treated and connected again without cutting the heat treatment connection portion.

If the characteristics of the connecting portions J1 to J5 and J10 connected by heat treatment are satisfactory, each lead wire of a set of two heat-treated connected wires is routed on the lower surface side of the joint plate 17 and the joint is connected as follows. Store in plate 17.

In the case of the lead wires 7a and 8a extending from the first superconducting coil 1, first, the lead wires 7a and 8a are passed together between the set of guide members 25. Then, basically, the lead wires 7a and 8a are hung around the plate-shaped bodies 23a to 23c in the order of the plate-shaped bodies 23a, 23b and 23c. After that, the connecting portions J2 of the lead wires 7a and 8a are stored in the box-shaped body 26.

Here, when the heat treatment connection between the end of the lead wire 7a and the end of the lead wire 8a can be completed in the first (first time) operation (when the characteristics of the connection portion J2 are satisfactory), FIG. The arrangement of the plate-shaped body 23b shown by the solid line is applied to. If the first failure fails and the heat treatment connection can be completed in the second operation of cutting the heat treatment connection portion and reconnecting the vicinity portion by heat treatment, the plate-shaped body 23b is moved to the plate-shaped bodies 23a and 23c side. The slide is moved to shorten the length of the arrangement path of the leader lines 7a and 8a. The wiring of the plate-shaped body 23b that has been slid and the lead wires 7a and 8a at this time is shown by a two-dot chain line in FIG. When the heat treatment connection is cut again after two failures and the heat treatment connection is completed in the third operation, the wiring of the lead wires 7a and 8a is shown by the dotted lines in the plate-like bodies 23a and 23c. In this order, the plate-shaped body 23b is skipped and the lead lines 7a and 8a are hung around. By skipping the plate-shaped body 23b, the length of the arrangement path of the lead wires 7a and 8a can be further shortened, and even if the lead wires 7a and 8a are shortened by repeated cutting, it can be dealt with.

When one is a lead wire 7a extending from the first superconducting coil 1 and the other is a lead wire 21 extending from the permanent current switch 20, a plate-shaped body 27 is also used in addition to the plate-shaped bodies 23a to 23c. The lead wire 21 extending from the permanent current switch 20 is hung around the plate-shaped body 27, and the lead wire 7a extending from the first superconducting coil 1 is passed between the set of guide members 25. Subsequent routing of the leader wires 7a and 21 is the same as the routing of the leader wires 7a and 8a.

It should be noted that the drawing of the lead wire other than the above such as the lead wire 12a and the storage of the connecting portions J6 to J9 are performed on the joint plate 19 in the same manner as described above. The lead wires 12a to 14 are spirally wound around the outer peripheral surface of the tubular body 18.

Further, the fixing of the leader wire may be reinforced by using an adhesive, putty, tape, wax, clay or the like, or the fixing of the leader wire may be reinforced by sandwiching it with a metal plate.

In the present embodiment, the leader wire connecting portions J1 to J5 and J10 are arranged on the joint plate 17, and the remaining connecting portions J6 to J9 are arranged on the joint plate 19, but the leader wire connecting portions J1 to J10 are arranged. The arrangement of is not limited to this.

Further, a lead wire (= superconducting wire material) from, for example, a second superconducting coil 2 which is an outer layer of the first superconducting coil 1 is routed by a joint plate 19, and a connection portion with the lead wire is stored in the joint plate 19. You may. The superconducting wire material constituting the second superconducting coil 2 is, for example, a low temperature superconducting wire material.

According to the above configuration, a plurality of connecting portions J1 to J10 of the superconducting wires 7 to 15 can be integrated into the joint plates 17 and 19. Therefore, even if there are many connecting portions of the superconducting wire, the arrangement can be easily performed. Further, since the lead wire 7a to 15a (superconducting wire material) can be spirally wound around the tubular bodies 16 and 18 to perform the routing work, the edgewise bending of the superconducting wire material 7 to 15 is unnecessary, and the work is performed. Is easy.

Further, by arranging the plurality of joint plates 17 and 19, many connecting portions of the superconducting wire can be arranged, so that the superconducting coil of the outer layer than the first superconducting coil 1 such as the second superconducting coil 2 can be arranged. It is also possible to store the connection portion with the lead wire from the joint plate 19.

Further, by providing the adjusting mechanism 23 on the joint plates 17 and 19, even if the lead wire is shortened due to the connection failure of the lead wire (superconducting wire material), the lead wire can be appropriately routed.

Further, the box-shaped bodies 26 are provided on the joint plates 17 and 19, and the connecting portion of the lead wire (superconducting wire) is stored in the box-shaped body 26, so that the resistance of the connecting portion to the Lorentz force in a magnetic field is improved. To do.

In the above embodiment, the adjusting mechanism 23 has a plurality of plate-shaped bodies 23a to 23c around which the superconducting wire is hung, and at least one plate-shaped body 23b of the plate-shaped bodies 23a to 23c is a joint plate. It is attached so that it can be slidably moved with respect to 17. According to this configuration, the adjusting mechanism 23 can be easily formed.

Further, in the above embodiment, the outer diameter of the tubular body 16 as the wiring first holding portion is the same as the outer diameter of the body portion 6a of the winding frame 6, and the tubular body 18 as the wiring first holding portion is also used. The outer diameter of the winding frame 6 is larger than the outer diameter of the body portion 6a of the winding frame 6. According to this configuration, the lead wires 7a to spirally wound around the tubular bodies 16 and 18 are compared with the case where the outer diameters of the tubular bodies 16 and 18 are smaller than the outer diameter of the body portion 6a of the winding frame 6. The curvature of 15a is reduced, and breakage of the lead wires 7a to 15a can be suppressed. From this point of view, the tubular bodies 16 and 18 preferably have an outer diameter equal to or larger than the outer diameter of the body portion 6a of the winding frame 6.

Here, for example, in the superconducting magnet device shown in FIGS. 1 to 5, the superconducting wires 7 to 15 (including the lead wires 7a to 15a) and the superconducting wires (lead wires 21 and 22) of the permanent current switch 20 are all high-temperature superconducting. Instead of using wire rods, superconducting wires 7 to 15 (including lead wires 7a to 15a) are used as high-temperature superconducting wires, and the superconducting wires (lead wires 21 and 22) of the permanent current switch 20 are NbTi wires (low-temperature superconducting wires). May be. In this case, the permanent current switch 20 is arranged at a place different from the joint plates 17 and 19 (appropriate place outside the joint plates 17 and 19).

The fact that the permanent current switch 20 is arranged at a position different from the joint plates 17 and 19 is a member different from the joint plates 17 and 19 that constitutes the superconducting magnet device, and constitutes the permanent current switch 20. It means that the permanent current switch 20 is attached to a member capable of cooling the permanent current switch 20 so that the superconducting wire material maintains the superconducting state.

The above embodiment can be further modified as follows.
The shape of the superconducting wire may not be a tape shape, but may be a cylindrical shape or the like. Further, the superconducting wire may be a low temperature superconducting wire instead of the high temperature superconducting wire.

The connecting portions J1 to J10 of the superconducting wire do not necessarily have to be the ends of the superconducting wire, and the superconducting wire may be connected at a position slightly away from the end.

The plate-shaped bodies 23a to 23c may have a shape such as an ellipse or an ellipse instead of a perfect circle, as long as the shape can suppress deterioration of the superconducting wire due to bending of the wire.

In the above embodiment, an example in which a plurality of superconducting wires (leading wires) extending from the first superconducting coil 1 in the innermost layer are stored in the joint plates 17 and 19 via a tubular body 16 extending from the winding frame 6 and the like. Indicated. In addition to the superconducting coil in the innermost layer, a superconducting coil that is not the innermost layer, that is, a plurality of superconducting wires (leading wires) extending from the second superconducting coil 2 and the third superconducting coil 3 are formed in the same manner as in the case of the first superconducting coil 1. In addition, it may be stored in the joint plate (wiring second holding portion) via a tubular body (wiring first holding portion) extending from each winding frame.

The first superconducting coil 1 shown in FIG. 4 is wound around the winding frame 6 by a layer winding method such as an in-layer non-insulation method in order to pull out the superconducting wire from the first superconducting coil 1 to the tubular body 16 side. Is preferable. Here, the in-layer non-insulation method is to use an uninsulated superconducting wire and insert a metal sheet with one side insulated between the layers of the coil, or insert an insulating sheet and a metal sheet. Therefore, it is a winding method that enhances the thermal stability of the coil by electrically contacting the superconducting wires in the layer.

The embodiments and modifications of the present invention have been described above. In addition, it is possible to make various changes within the range that can be assumed by those skilled in the art.

1: 1st superconducting coil (superconducting coil)
6: Winding frame 6a: Body 7 to 15: Superconducting wire 7a to 15a: Lead wire (superconducting wire)
16, 18: Cylindrical body (wiring first holding part)
17, 19: Joint plate (wiring second holding part)
20: Permanent current switch 23: Adjustment mechanism 23a to 23c: Plate-shaped body 26: Box-shaped body 28: Embedded portion J1 to J10: Connection portion

Claims (7)

Superconducting coil and
A wiring first holding portion extending from the winding frame of the superconducting coil toward the axial direction of the superconducting coil,
A plurality of wiring second holding portions arranged on the same side as the wiring first holding portion in the axial direction, extending in a direction intersecting the axial direction, and the winding frame and the wiring first holding portion. Multiple wiring second holding parts with a diameter larger than one holding part,
With
The second wiring holding portion has an adjusting mechanism for adjusting the length of the arrangement path of the superconducting wires extending from the superconducting coil and being connected to each other, and a box shape for storing the connecting portion of the superconducting wires. The body is provided,
The wiring is in a state in which the superconducting wire is spirally wound around the first holding portion of the wiring, the length of the arrangement path is adjusted by the adjusting mechanism, and the connecting portion is stored in the box-shaped body. It is fixed to the second holding part,
Superconducting magnet device. In the superconducting magnet device according to claim 1,
The adjusting mechanism has a plurality of plate-like bodies around which the superconducting wire is hung.
At least one of the plate-shaped bodies is slidably attached to the wiring second holding portion.
Superconducting magnet device. In the superconducting magnet device according to claim 1 or 2.
The wiring first holding portion has an outer diameter equal to or larger than the outer diameter of the body portion of the winding frame.
Superconducting magnet device. In the superconducting magnet device according to any one of claims 1 to 3.
The superconducting wire is a tape-shaped wire.
Superconducting magnet device. In the superconducting magnet device according to any one of claims 1 to 4.
Equipped with a permanent current switch
An embedded portion for embedding the permanent current switch is provided in the wiring second holding portion.
Superconducting magnet device. In the superconducting magnet device according to any one of claims 1 to 4.
Equipped with a permanent current switch
The permanent current switch is arranged at a position different from the wiring second holding portion.
Superconducting magnet device. In the superconducting magnet device according to any one of claims 1 to 6.
The superconducting coil is wound in an in-layer non-insulated manner.
Superconducting magnet device.

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