JPH0497506A - Superconductive electromagnetic coil - Google Patents

Abstract

PURPOSE:To firmly fix the superconductive cables of the corner section of a saddle-like coil by inserting spacers in the spaces between superconductive cables and in the corners of the saddle-like coil. CONSTITUTION:In spaces 10 between turns of inner side superconductive cable 5 in corners 20, the spacer sheets 21 made of epoxy varnish impregnated and semi-hardened glass tape are inserted while winding round inner side super- conductive cable 5. Next, the wound up superconductive bipolar electromagnetic coil is heated to harden the epoxy varnish with which sheets 21 is impregnate, and in the hardening process a pressure is continuously applied to the epoxy varnish starting from the edge of corner 20 such that the molten epoxy varnish flows, changes shape, and fills spaces 10 until varnish hardening is completed. With this, the move of superconductive cable caused by an electromagnetic force generated when exciting the magnet can be suppressed and the cable can be easily held into the superconductive condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a superconducting electromagnetic coil used in an accelerator that accelerates and accumulates charged particles.

[Prior art] Figure 4 shows, for example, rTEST RESULTS FRON.
1.8-HSSCMODEL DIPOLESJ(I
EEE TRANSACTIONS ON MANET
ICS.

VOL, 24. No, 2. P816. MARCH198
8) is a cross-sectional view showing the conventional superconducting dipole electromagnetic coil shown in FIG. Deflection magnetic field B, (3
) is a beam tube that passes the charged particle beam (1), (4) is a superconducting dipole electromagnetic coil that generates the deflection magnetic field B (2), (
5) is an inner superconducting cable forming the superconducting dipole electromagnetic coil (4), and (6) is also an outer superconducting cable. (7) is a wedge-shaped spacer arranged between each of the inner superconducting cable (5) and the outer superconducting cable (6).

In addition, Fig. 5 shows a partial perspective view of the saddle-shaped coil (11) wound with the inner superconducting cable (5) of the superconducting dipole electromagnetic coil (4). This is a corner part, and (9) is a coil end spacer placed at the corner part (8).

FIG. 6 is a sectional view taken along line VI-VI in FIG.
10) is a gap formed between the inner superconducting cables (5).

Next, the operation will be explained. When the charged particle beam (1) passes through the beam tube (3), which is kept in a vacuum, in a direction penetrating the page of Fig. 4, the superconducting dipole electromagnetic coil (4)
) is subjected to a Lorentz force from the deflection magnetic field B(2), and is bent with a curvature in a direction parallel to the plane of the paper.

In this way, the superconducting dipole electromagnetic coil (4) is bent in the intended direction of the charged particle beam (1), and the charged particle beam (1) is placed on a predetermined trajectory.

Inner superconducting cable (5) and outer superconducting cable (
6) is usually fan-shaped in the cross section of the superconducting dipole electromagnetic coil (4) as shown in Figure 4, and the cross section of the inner and outer superconducting cables (5) and (6) is wedge-shaped rather than rectangular. However, due to manufacturing constraints of the inner and outer superconducting cables (5) and (6), there is a limit to the wedge angle.
) to adjust the arrangement of the inner and outer superconducting cables (5) and (6).

On the other hand, the inner superconducting cable (5) is wound from the front of the paper through the corner part (8) to the other side of the paper, and outside the right side of the paper, the inner superconducting cable (5) is wound again through the corner part (8) of a similar shape to the one next to the beginning of the winding. Return to the turn.

In this way, turns are stacked one after another in a spiral shape to create a saddle-shaped coil (
11) is formed, but the inner superconducting gable (5) is formed using coil end spacers (9) at the corners (8).
) are mechanically fixed. However, the corner part (
8), since the wedge-shaped inner superconducting cable (5) is wound in the axial direction, a wedge-shaped gap (10 ) is formed.

Note that, similarly to the inner superconducting cable (5), the outer superconducting cable (6) is also spirally stacked to form a saddle-shaped saddle-shaped coil, and gaps are formed at the corner portions.

[Problems to be Solved by the Invention] As described above, conventional superconducting dipole electromagnetic coils usually have an inner superconducting cable (5), an outer superconducting cable (5), and a wedge-shaped cross section.
<6), with the inner superconducting cable (5) at the corner part (8) of the saddle-shaped coil (]]) and the outer superconducting cable (5).

(6) is wound in the axial direction, gaps are formed between the turns, reducing the mechanical rigidity of this corner part (8), and when the electromagnet is excited, the inner and outer superconducting cables (5), (
6) moves due to electromagnetic force and has a problem in that it is difficult to maintain a superconducting state.

This invention was made to solve the above-mentioned problems, and to obtain a superconducting electromagnetic coil that can easily maintain a superconducting state by firmly fixing the superconducting couple at the corner portion of the saddle-shaped coil. With the goal.

[Means for Solving the Problems] The superconducting electromagnetic coil of the first aspect of the present invention includes a spacer for suppressing the movement of the superconducting cables in the gap between the superconducting cables that occurs at the corner portion of the saddle-shaped coil. It has been established.

Further, in the superconducting electromagnetic coil of the second invention, the cross-sectional shape of the superconducting cable is rectangular, and a compensating spacer is provided in the gap created in the straight portion of the saddle-shaped coil.

[Function] In the first invention of the present invention, a spacer is provided in the gap between the superconducting tuples, and in the second invention, the cross-sectional shape of the superconducting cable is made rectangular, and the saddle-shaped coil is Providing the supplementary spacer between the straight parts increases the mechanical rigidity of the superconducting electromagnet coil, making it difficult to move even if electromagnetic force is applied to the superconducting cable when the electromagnet is excited.

[Example] The present invention will be described in detail below. FIG. 1 is a sectional view of a main part showing an embodiment of the first invention of the present invention, and the same or corresponding parts as in FIGS. 4 to 6 are given the same reference numerals.
The explanation will be omitted.

In the figure, (20) is the corner part of the saddle-shaped coil (11) formed by winding the inner superconducting cable (5), and (21)
is a heat-curable spacer sheet inserted into the gap (10) formed between the turns.

In the superconducting dipole electromagnetic coil configured as above,
A gap (10) is formed between the turns of the inner superconducting gable (5) at the corner part (20), as in the conventional technology.This gap (10) is filled with a semi-hardened glass tape impregnated with epoxy varnish. Insert the spacer sheet (21). The spacer sheet (30) is inserted while winding the inner superconducting cable (5).

The wound superconducting dipole electromagnetic coil is heated to harden the epoxy varnish impregnated into the spacer sheet (30). During this curing process, the epoxy varnish flows and deforms, and the varnish is completely cured while applying pressure from the ends of the corner portions (20) so as to fill the gaps (10) between the turns.

FIG. 2 is a cross-sectional side view of a corner portion of a saddle-shaped coil showing an embodiment of the second invention, in which (30) is an inner superconducting cable with a rectangular cross-section, and (31) is a saddle-shaped coil (
32).

Figure 3 shows only the inner superconducting cable (30) of the quarter section of the superconducting dipole electromagnetic coil of the second invention, and (33) shows the straight section of the superconducting dipole electromagnetic coil. The inner superconducting cable (
This is a supplementary spacer inserted into the gap created between the saddle-shaped coils (32) due to the adoption of 30).

In the superconducting dipole electromagnetic coil configured as above,
By making the cross-sectional shape of the inner superconducting cable (30) rectangular, there is no gap between the turns at the corner part (31).Actually, the inner superconducting cable (30) is wound in a cylindrical shape at the corner part (31). As it is rotated, a small gap is created between the turns, but this gap is sufficiently smaller than that shown in FIG. 6 as a conventional example.

In addition, although the gap formed between the turns of the inner superconducting cable (5) has been described as an embodiment of the first invention and the second invention, similar measures can be taken for the outer superconducting coil (6). can do.

Further, in the above embodiments of the first invention and the second invention,
In both cases, a superconducting dipole electromagnetic coil that deflects a charged particle beam (1) has been described, but the present invention can also be applied to a superconducting quadrupole electromagnetic coil that focuses a charged particle beam and a superconducting large pole electromagnetic coil that corrects it.

[Effects of the Invention] As explained above, according to the superconducting electromagnetic coil of the first aspect of the present invention, by providing a spacer in the gap created in a part of the corner of the saddle-shaped coil, the electromagnetic force is reduced when the electromagnet is excited. This has the effect of suppressing the movement of the superconducting cable and easily maintaining the superconducting state.

Moreover, according to the superconducting electromagnetic coil of the second invention of the present invention, the cross-sectional shape of the superconducting cable is made rectangular, and a supplementary spacer is provided between the straight parts of the saddle-shaped coil, so that it is similar to the first invention. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a corner portion showing a superconducting dipole electromagnetic coil according to an embodiment of the first aspect of the present invention;
The figure is a cross-sectional side view of a water-containing corner part of an embodiment of the second invention, Figure 3 is a cross-sectional front view of the main part of the thing shown in Figure 2, and Figure 4 is a cross-section showing an example of a conventional superconducting dipole electromagnetic coil. FIG. 5 is a front view, FIG. 5 is a perspective view of a corner portion of the coil, and FIG. 6 is a cross-sectional side view taken along the line ■-■ in FIG. 5. In the figure, (5) and (30) are inner superconducting cables,
(11) and (32) are saddle-shaped coils, (1o) is a gap, (
20) and (31) are corner parts, (21) is a spacer sheet, and (33) is a supplementary spacer. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Teru Sogado 21-
%3 Figure Horse 4 Figure 31 - Corner procedural amendment (method) % formula % Display of case 1990 Patent Application No. 215053 2゜ Title of invention Case with person who corrects superconducting electromagnet coils Related patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo
Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4゜

Claims (2)

[Claims] (1) In a superconducting electromagnetic coil equipped with a saddle-shaped coil formed by winding a superconducting cable having a wedge-shaped cross section into a saddle-shaped shape, the superconducting cable is A superconducting electromagnetic coil characterized by the provision of a spacer to suppress movement. (2) In a superconducting electromagnetic coil equipped with a saddle-shaped coil formed by winding a superconducting cable in a saddle-shaped shape, the cross-sectional shape of the superconducting cable is rectangular, and a spacer is used to compensate for the gap created in the straight part of the saddle-shaped coil. A superconducting electromagnetic coil characterized by being provided with.