JPH0727104U - Superconducting magnet - Google Patents

Abstract

(57) [Summary] [Objective] To provide a superconducting magnet capable of improving the cooling performance of a superconducting conductor and preventing coil damage due to quenching. [Structure] In a superconducting magnet in which a superconducting coil is wound around a reinforcing member 6 having a gate structure, and a helium cooling groove 9 is provided between turns on the inner peripheral side of the coil, a corner portion helium cooling passage 11 is provided inside a corner portion of the reinforcing member 6. And a plurality of cooling slits 12 communicating the helium cooling grooves 9 between turns adjacent to each other in the pan direction are provided in the turn direction of the coil, and a hole 13 communicating the corner helium cooling passage 11 and the cooling slit 12 is formed in the coil. The feature is that multiple units are installed in the turn direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a superconducting magnet using a superconducting coil, and more particularly to a superconducting magnet with improved cooling means.

[0002]

[Prior art]

 Conventionally, superconducting magnets have been used for superconducting energy storage devices and for confining fusion plasmas. As a superconducting magnet of this type, FIG. 3 shows a conventional immersion cooling type superconducting coil assembly. In the figure, 1 is a superconducting coil, 2 is a conductor whose main constituent is a superconducting material, and 3 is a coil pressing metal fitting.

FIG. 4 schematically shows a cross section taken along the line BB ′ of the coil shown in FIG. 3, and 4 is an insulating material between coils of a coil (a bread is a block of a coil wound in a radial direction). ), 5 indicates an insulating material between turns of the coil.

FIG. 5 is an enlarged view of a coil cross section (enlarged view of a portion C in FIG. 4). In the figure, 6 is a reinforcing material having a gate structure that receives an electromagnetic force acting on the coil, 7 is a wire made of a superconducting material (superconducting conductor) and a stabilizing material, 8 is a solder material for fixing the wire 7, 9 Is a helium cooling groove between turns.

In the above structure, when a current flows through the superconducting conductor and the wire 7 is raised in the superconducting state for some reason, the superconducting conductor may change from the superconducting state to the normal conducting state. This phenomenon is called quench. If the wire 7 is composed of only the superconducting conductor, if quenching occurs, Joule heat is generated in that part, and the superconducting conductor is damaged.

Therefore, in order to prevent this damage, a wire having a stabilizing material, such as Cu or Al, having a small specific resistance at an extremely low temperature is arranged around the superconducting conductor, and the periphery thereof is cooled by a liquid helium. The structure is taken.

However, this type of superconducting magnet has the following problems. That is, the surface on which the superconducting conductor is directly cooled by liquid helium is only the inter-turn helium cooling groove 9, and the reinforcing material 6 is present on the other surfaces, so that the cooling performance is poor. For this reason, quenching is likely to occur, which may lead to coil burnout. In addition, there is a problem that solder does not easily flow into the inner corner portion of the reinforcing member 6 and that defective construction is likely to occur.

[0008]

[Problems to be solved by the device]

 As described above, in the conventional superconducting magnet, since the superconducting conductor is cooled only at the helium cooling groove between turns, the cooling performance of the superconducting conductor is deteriorated, and there is a risk of coil damage due to quenching.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a superconducting magnet capable of improving cooling performance of a superconducting conductor and preventing coil damage due to quench. To do.

[0010]

[Means for Solving the Problems]

 The present invention adopts the following configurations in order to solve the above problems. That is, the present invention is a superconducting magnet in which a superconducting coil is wound around a reinforcing material having a gate structure, and a cooling space is provided in an inner corner portion of the reinforcing material, and a hole for communicating the cooling space and the periphery of the reinforcing material is formed in the coil. The feature is that multiple units are installed in the turn direction.

[0011]

[Action]

 According to the present invention, liquid helium penetrates into the cooling space (corner helium cooling passage) provided at the inner corner of the reinforcing material, and the superconducting conductor is also directly cooled from the direction opposite to the inter-turn helium cooling groove. Like Therefore, the cooling performance of the conductor is improved. In addition, solder does not easily flow in the inner corners of the reinforcing material, and construction defects are likely to occur, but this problem can be solved by installing wire rod fixing brackets and the like at the inner corners of the reinforcing material to provide a cooling space. It becomes possible.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a view showing a cross section of a coil portion of a superconducting magnet according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. The same parts as those in FIGS. 3 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

A wire rod fixing metal fitting 10 is attached to the inside of the reinforcing member 6 having a gate structure (a U-shaped cross section) so that a space is provided at a corner portion. The space between the inner corner portion of the reinforcing member 6 and the wire rod fixing metal fitting 10 becomes the corner portion helium cooling passage 11. A plurality of cooling slits 12 are provided at a circumferential pitch at both ends (opening side ends) of the reinforcing member 6 so as to communicate the helium cooling grooves 9 between the turns in the pan direction.

Further, a plurality of communication holes 13 that communicate the corner helium cooling passage 11 and the periphery of the reinforcing member 6 are provided in the coil turn direction. These communication holes 13 communicate with the cooling slits 12 around the reinforcing material 6. Reference numeral 14 in the figure is a notch formed in the inter-pan insulating material 4 and the inter-turn insulating material 5 to secure a helium cooling passage.

With such a configuration, the liquid helium flows not only in the inter-turn helium cooling groove 9 but also in the corner helium cooling passage 11. For this reason, the superconducting conductor is cooled not only from the inter-turn helium cooling groove 9 but also from the corner helium cooling passage 11, so that the cooling performance can be improved. Therefore, quenching of the superconducting conductor can be prevented, and coil damage due to quenching can be suppressed.

Further, in the present embodiment, since the wire rod fixing metal fitting 10 is provided at the inner corner portion of the reinforcing member 6, the corner portion of the reinforcing member 6 where the conductor composed of the wire rod 7 and the solder member 8 contacts is not a right angle. It becomes an obtuse angle. Therefore, the solder material 8 easily flows into the inner corner portion of the reinforcing material 6, and there is an advantage that the occurrence of defective construction can be prevented. It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the scope of the invention.

[0017]

[Effect of device]

 As described above, according to the present invention, the superconducting conductor is directly cooled by the liquid helium not only from the inter-turn helium cooling groove but also from the opposite side by providing the cooling space at the inner corner of the reinforcing material. The cooling performance is improved and the coil damage due to quench can be prevented.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a coil portion of a superconducting magnet according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow A in FIG.

FIG. 3 is a view showing an assembly of a conventional superconducting magnet.

FIG. 4 is a sectional view taken along the line BB ′ of FIG.

FIG. 5 is a view showing a cross section of a coil portion of a conventional superconducting magnet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coil 2 ... Conductor 3 ... Coil pressing metal fitting 4 ... Coil pan-pan insulating material 5 ... Coil inter-turn insulating material 6 ... Reinforcing material 7 ... Wire material 8 ... Solder material 9 ... Inter-turn helium cooling groove 10 ... Wire material fixing metal fitting 11 ... Corner Helium Cooling Passage 12 ... Cooling Slit 13 ... Communication Hole 14 ... Notch

Claims (1)

[Scope of utility model registration request] 1. A superconducting magnet in which a superconducting coil is wound around a reinforcing material having a gate structure, and a cooling space is provided at an inner corner portion of the reinforcing material, and a hole for communicating the cooling space with the periphery of the reinforcing material is formed. A superconducting magnet, wherein a plurality of the coils are installed in a turn direction of the coil.