JPH0480905A - Saddle type superconducting coil - Google Patents

Abstract

PURPOSE:To unnecessitate winding of an insulating tape, and to improve the cooling efficiency of a conductor by a method wherein the interlayer spacer in a coil is formed by fiber-reinforced plastic, and also a recessed part is continuously formed on the interlayer spacer. CONSTITUTION:The wedge-shaped interlayer spacer 21, which is arranged between the layers of a superconducting conductors 1a constituting a saddle-shaped superconducting coil, is formed using glass fiber reinforced plastic. Besides, by continuously-providing the wedge-shaped interlayer spacers 22 by conducting a machine work, the recessed parts 3 can be utilized as the flow passage of liquid helium to be used for cooling of the conductor, and the cooling efficiency of the superconducting conductor 1a can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wheel-shaped superconducting coil used in accelerators and the like.

[Conventional technology]

Figure 3 shows, for example, IEEETransact on Magnet.
ions on Magnets) (March 1989) Vol. 5AG-25, No. 2, pages 1444-1450; The cross-shaped superconducting coil formed by winding (2) is a wedge-shaped interlayer spacer placed between the eyebrows of the superconducting conductor (1 m).

In the above configuration, the saddle-shaped superconducting coil (1) is created by winding the superconducting conductor (1a). In order to obtain the circular cross-sectional structure shown in Figure 0, the superconducting conductor (1a) is created with a wedge-shaped cross-sectional structure. If the curvature of the circular cross section of the saddle-shaped superconducting coil (1) is larger than the wedge-shaped structure of the superconducting conductor (1a) and it is impossible to obtain the desired curvature with the superconducting conductor alone, a wedge-shaped interlayer spacer ( 2) to obtain the desired curvature.

The conventional wedge-shaped interlayer spacer (2) requires mechanical strength and electrical insulation, and in consideration of the processing method, a metal wedge wrapped with insulating tape is often used. ) has the property that the electrical resistance becomes zero when it becomes below the critical temperature Tel: K). In order to keep the superconducting conductor (1a) below Tc (K), the saddle-shaped superconducting coil (1) is 4.2CK). , immersed in liquid helium at 1 [atmosphere]. Conventional saddle-type superconducting coils often have a structure in which liquid helium is flowed into a small gap (4) between conductors to maintain the conductor at Tc [K] or lower.

[Problem to be solved by the invention]

Since conventional superconducting coils are constructed as described above, it was necessary to wrap an insulating tape around the metal spacer in order to electrically insulate the wedge-shaped interlayer spacer.

In addition, since resin is filled between the conductors to suppress the movement of the conductors, fluid helium is not immersed between the conductors.
<, There was a problem that the cooling efficiency of the superconducting conductor was poor.

This invention was made in order to solve the above-mentioned problems, and it is possible to obtain a hollow-shaped superconducting coil equipped with a wedge-shaped interlayer spacer that has sufficiently strong electrical insulation without having to wrap an insulating tape for electrical insulation. The aim is to obtain a salmon roe-type superconducting coil with good conductor cooling efficiency.

[Means to solve the problem]

In the saddle-shaped superconducting coil according to the first aspect of the present invention, the interlayer spacer within the coil is made of fiber-reinforced plastic.

Moreover, in addition to the above-mentioned structure, the saddle-shaped superconducting coil according to the second invention has a concave portion continuously formed in the glabellar spacer.

[For production]

In the first aspect of the invention, since the wedge-shaped interlayer spacer made of fiber-reinforced plastic is used, there is no need to wrap an insulating tape around the spacer for electrical insulation.

Further, in the second invention, since a wedge-shaped interlayer spacer having continuous recesses is used, a liquid helium flow path can be secured, and the cooling efficiency of the conductor is improved.

〔Example〕

FIG. 1 shows an embodiment of the first invention, and in the figure, a wedge-shaped interlayer spacer (21) placed between the eyebrows of a superconducting conductor (1a) forming a saddle-shaped superconducting coil is reinforced with glass fibers. made of plastic.

Next, the effect will be explained. The general functions of the superconducting conductor (1a) and the wedge-shaped interlayer spacer (21) are the same as in the prior art. Here, a wedge-shaped interlayer spacer (
21) from glass fiber reinforced plastic will be explained.

Glass fiber-reinforced plastic has high insulating properties, so there is no need to form a metal conductor into a wedge shape and then wrap it with insulating tape, as in the past.

Furthermore, since it is easier to machine than metal, it can be easily formed into a wedge shape.

Second [! 1 shows an embodiment of the second invention, and in the figure, the superconducting conductor (1a) of the saddle-shaped superconducting coil (1) is made of glass fiber reinforced plastic, and has continuous recesses (3) on the surface. The formed wedge-shaped interlayer spacer (22
) is inserted.

With the above configuration, the wedge-shaped interlayer spacer (22), which does not need to be wrapped with insulating tape, has a continuous recess (3).
It is possible to perform machining. The recess (3) can be utilized as a liquid helium flow path for cooling the conductor, thereby increasing the cooling efficiency of the superconducting conductor (1a).

Although the wedge-shaped interlayer spacer is formed of glass fiber reinforced plastic in the above embodiment, it may be formed of an alumina fiber laminate instead of glass fiber reinforced plastic.

〔Effect of the invention〕

As described above, according to the first aspect of the present invention, since the wedge-shaped interlayer spacer is formed of fiber-reinforced plastic, the work of wrapping an insulating tape around the spacer can be omitted.

Further, according to the second invention, by continuously providing the recessed portions in the spacer, the cooling efficiency of the conductor can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of an embodiment of the first invention, Fig. 2 is a perspective view of a main part of an embodiment of the second invention, and Fig. 3 is a diagram of a conventional saddle-shaped superconducting coil. FIG. (1)...neck-shaped superconducting coil, (1a) superconducting conductor, (21), (22)-wedge-shaped interlayer spacer, (3)... recess. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A saddle-shaped superconducting coil comprising a wound superconducting conductor and a wedge-shaped interlayer spacer between the superconducting conductors, wherein the wedge-shaped interlayer spacer is made of fiber-reinforced plastic. (2) The saddle-shaped superconducting coil according to claim (1), wherein a concave portion serving as a liquid helium flow path is continuously formed in the wedge-shaped interlayer spacer.