JPS6218005Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a superconducting coil formed by winding a plurality of insulation-coated superconducting coil wires.

In general, a superconducting coil is immersed in liquid helium as a coolant to cool the entire coil to an extremely low temperature, thereby making it superconducting and easily generating a high magnetic field with a small amount of electric power.

However, when superconducting coil wires are wound, there is instability in superconducting operating characteristics such as critical current characteristics, training effects, and low magnetic field instability. In order to prevent this instability phenomenon, stabilization processing is performed on actual superconducting wires. For coil wires used in small magnets, etc., the superconducting wire is copper-plated, and for large magnets, stabilizing strips are used. This is a copper strip with superconducting wires embedded in it.

However, in a superconducting coil in which the surface of the stabilized copper is electrically insulated and a multi-row and multi-stage winding structure is adopted, even if the refrigerant completely permeates the center of the coil compared to the surface part of the coil, heat may be generated, however minute, due to fluctuations in the magnetic field from the outside, wire movement, etc. This phenomenon has the disadvantage that even if it is a pulse-like generation occurring in a partial location of one coil strand, it can induce the rapid propagation of superconducting breakdown, the so-called quench phenomenon.

The present invention was developed in view of the above points, and its purpose is to prevent rapid propagation of superconducting breakdown and stabilize the superconducting state even if the coil wire generates heat. Our aim is to provide superconducting coils that can

The present invention achieves the intended purpose by providing a copper plate that electrically forms one turn inside a superconducting coil.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings.

FIG. 1 shows an embodiment of the superconducting coil of the present invention. The superconducting coil 2 shown in the figure is formed by winding the superconducting coil wire 1 multiple times, but in this embodiment, the superconducting coil 2 is internally divided concentrically into a plurality of parts (three in the embodiment). A copper plate 3 is provided around the entire circumference of this divided portion, and this copper plate 5 forms one electrically complete turn.

Therefore, in the configuration of this embodiment, since the superconducting coil 2 is immersed in the refrigerant, it is natural that the copper plate 3
The entire length is also cooled to the refrigerant temperature.

As seen in FIG. 1, the copper plate 3 is seamlessly integrated in the axial direction, and both ends are completely in contact with the refrigerant, so even if the central part of the copper plate 3 receives heat, it will not dissipate due to heat conduction. It is quickly brought back to the refrigerant temperature. The superconducting coil 2, which is made by winding superconducting coil wires 1 in close contact with each other, is in complete contact with a large amount of refrigerant only at the superconducting coil wires 1 located on the inner and outer diameter surfaces, and on the surfaces of both ends in the axial direction. It is. Even if the superconducting coil strands 1 generate heat due to wire movement at the center of the cross-section of the superconducting coil 2, cooling must occur through sequential heat transfer through the superconducting coil strands 1 that are in close contact with each other. There is a risk of superconducting destruction.

At this time, as shown in FIG. 1, if a plurality of copper plates 3 are rolled up, the temperature of the superconducting coil wire 1 can be brought back to the refrigerant temperature more quickly through the copper plate 3 closest to the heat generating part. In addition, since the copper plate 3 completely forms one turn, when the superconducting coil 2 is used as a primary winding, it acts as a secondary winding that is electromagnetically coupled to this, and in the case of a quench phenomenon, the superconducting coil 2 The superconducting coil 2 has the effect of suppressing sudden current changes, and the superconducting coil 2 can have a more stable superconducting state.

Fig. 2 shows another embodiment of the present invention, which differs from Fig. 1 in that the superconducting coil 2 is internally divided in the axial direction and a copper plate 3 is wound around this divided part to form the superconducting coil. The point is that

Even with this configuration of the present embodiment, the effects and operations are exactly the same as those of the embodiment shown in FIG.

In the above embodiment, a rectangular wire is shown as the superconducting coil wire 1, but it goes without saying that the same effect can be obtained even if a round wire is used.

According to the superconducting coil of the present invention explained above,
A copper plate that electrically forms one turn is installed inside the superconducting coil, so even if the coil wire generates heat, the copper plate quickly absorbs it, creating a superconducting coil that is stable against superconducting breakdown. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view showing one embodiment of the superconducting coil of the present invention, and FIG. 2 is a cross-sectional perspective view showing another embodiment of the present invention. 1... Superconducting coil wire, 2... Superconducting coil, 3... Copper plate.

Claims (1)

[Claims for Utility Model Registration] 1. A superconducting coil formed by winding a plurality of insulation-coated superconducting coil wires, characterized in that a copper plate forming one electrical turn is provided inside the superconducting coil. superconducting coil. 2. The superconducting coil according to claim 1, wherein the copper plate is provided at a plurality of concentric divisions of the superconducting coil. 3. The superconducting coil according to claim 1, wherein the copper plate is provided at a plurality of divided parts in which the superconducting coil is divided in the axial direction.