JPH05205544A - Forced refrigerating type superconductor and manufacture of the same - Google Patents

Abstract

PURPOSE:To effect no thermal effect inside a conductor in conduit welding and enable complete penetration welding of the conduit. CONSTITUTION:A superconductive wire 1, a stabilizing material 2 containing a liquid helium passage 3, insulating members 8 and 9 are accomodated in a conduit 4. A normal conductive tube 5 containing a coolant passage 7 is provided at the part adjascent to a conduit welding part 6. Accordingly, the passage of the coolant in the normal conductive tube 5 in conduit welding prevents the thermal effect on the inside of the superconductor due to welding heat, and the normal conductive tube 5 can be used as the liquid helium passage 3 after the completion of the conductor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced refrigeration type superconducting conductor for a nuclear fusion device and its manufacture.

[0002]

2. Description of the Related Art In a nuclear fusion device, there is a superconductor under development in the prototype toroidal coil project as a conductor for a FER toroidal magnetic field coil shown in FIG.

The structure of this superconductor accommodates a plurality of superconducting wires 1, a stabilizing material 2, a liquid helium flow path 3, insulating members 8 and 9 inserted to reduce coupling loss, solder 10, and the like. Consists of conduit 4. Liquid helium channel 3
Indicates that the space between the stabilizing material 2 and the conduit 4 is used, and the normal electric conduit is not used. Conduit weld 6
The portion adjacent to is also the liquid helium flow path 3, and the welding heat does not directly enter the inside of the conductor. However, the cooling method at the time of welding is by cooling from outside the conductor or by using an inert gas. Has a structure in which there is only a method of flowing the above into the above-mentioned flow path and cooling. The liquid helium flow path 3 is used only as a liquid helium flow path after completion of the conductor.

[0004]

Conduit welding is carried out in the final step of manufacturing a superconducting conductor. Cooling at the time of welding can only be done by flowing an inert gas from the outside of the conductor or into the liquid helium flow path 3. There is a possibility that the heat input to the solder may cause the solder to melt and damage the insulating material.

It is an object of the present invention to have no thermal influence on the inside of the conductor at the time of conduit welding, and further to provide a superconducting conductor which enables complete penetration welding of the conduit.

[0006]

In order to achieve the above object, a conductor having a normal conduit 5 incorporated in a portion adjacent to a conduit welded portion 6 is used, and a coolant is allowed to flow through the normal conduit 5 during welding. It was done. Further, after the conductor is completed, liquid helium can be made to flow also through this normal current conduit 5. Further, the normal conduit 5 is made of copper or aluminum so that it can be used as a part of the stabilizer 2 after the conductor is completed.

[0007]

[Operation] During conduit welding during the manufacturing process of superconducting conductor,
The coolant flows through the normal conduit 5, and the coolant absorbs the welding heat and carries it to the outside of the conductor, so that the inside of the normal conduit 5 is thermally protected. On the other hand, after the conductor is completed, the normal conduit 5 also becomes a part of the liquid helium flow path 3 and cools the superconducting wire, so that the superconducting wire is further cooled. Also, after the conductor is completed, current flows as a part of the stabilizing material in this normal conduit, so that superconductivity is made more stable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The superconducting wire 1 is stranded using a plurality of wires. The stabilizer 2 is made of copper or aluminum and has a function of stabilizing superconductivity. The liquid helium channel 3 is formed by bringing the superconducting wire 1 and the stabilizing material 2 into close contact with each other, for example, by soldering, and making the stabilizing material 2 into a gate shape. The material of the normal conduit 5 is copper or aluminum. Like the stabilizer 2, the superconducting wire 1 and the normal-conducting conduit 5 are closely attached by soldering or the like.
Reference numeral 4 denotes a conduit having strength against external force, which houses the superconducting wire 1, the stabilizing material 2, the insulating members 8 and 9, the solder 10, the liquid helium flow path 3 and the normal electric conduit 5.
It works to protect these from external forces. The conduit 4 has, for example, a conduit welded portion 6 sandwiched from above and below.

While the conductor is energized, the superconducting wire 1 or the stabilizing material 2
Current flows and the liquid helium flowing in the liquid helium flow path 3 absorbs the heat generated in the superconducting wire 1 or the stabilized copper 2 and carries it to the outside of the conductor, so that the superconducting wire 1 is sufficiently cooled to have thermal stability. obtain. Reference numeral 7 denotes a coolant flow passage and a liquid helium flow passage during conduit welding. When the conduit 4 is welded, for example, water is made to flow in the flow path 7 and the welding heat is absorbed by this water and called to the outside of the conductor. When energizing the superconductor manufactured in this way, an electric current is applied to the superconducting wire 1 or the stabilizing material 2.
Also, the superconducting wire 1 or the stabilizing material 2 and the normal-conducting conduit 5 flow through the normal-electric conduit 5 which also serves as a stabilizing material, and the liquid helium is provided in the liquid helium passage 3 and the helium passage 7 also serving as a conduit welding cooling passage. To be cooled.

According to the present embodiment, not only the complete penetration welding of the conduit is possible without the thermal influence at the time of welding inside the conductor, but also the conductor shown in the known example is hardly changed in its specifications. It is possible to manufacture.

In FIG. 2, the normal conduit 5 which contacts the conduit welded portion 6 in the embodiment shown in FIG. 1 is partially deformed so as not to contact the conduit welded portion 6. According to the present embodiment, it becomes possible to prevent the conduit welding portion 6 from being adversely affected by the normal current conduit 5 when welding the conduit 4.

FIG. 3 is an embodiment showing that the normal conduit 5 is attached to a superconducting conductor of a type different from the superconducting conductor shown in FIG. Since the normal-current conduit 5 has no support, it is attached to one side of the conduit 4 in advance. Further, in this case, the normal conduit 5 does not need to be a stabilizing material, so that it can be easily attached to the conduit 4 by using the same material as the conduit 4. According to this embodiment, the conduit 4 does not directly contact the superconducting wire 1 with welding heat and does not impair the superconducting characteristics.
It is possible to perform full penetration welding.

[0013]

According to the present invention, it is possible to prevent thermal influence on the inside of the superconductor by the heat of conduit welding. Further, the conduit can be completely melted and welded without thermally affecting the inside of the superconductor. further,
Not only can the normal conduit be used as a coolant channel during conduit welding, but it can also be used as another liquid helium channel or stabilizer. Further, by having the above-mentioned function, it is possible to manufacture a superconductor having the above-mentioned function without changing the cross section of the existing superconductor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a superconductor that best illustrates the characteristics of a normal conduit 5 in one embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view of the superconductor in which the conduit weld portion 6 is avoided in the normal conductor conduit 5 of the superconductor shown in FIG.

3 is a cross-sectional view of a superconductor of a type different from the superconductor shown in FIG. 1 in which the present invention is carried out.

FIG. 4 is a practical conductor T for a toroidal magnetic field coil for FER.
It is a sectional view of a MC-FF conductor.

[Explanation of symbols]

 1 Superconducting wire 2 Stabilizer 3 Liquid helium flow path 4 Conduit 5 Normal conduit 6 Conduit welding 7 Coolant flow path for conduit welding and liquid helium flow path 8 Insulation member 9 Insulation member 10 Solder

Front page continuation (72) Inventor Kiyoshi Yoshida 801-1 Nakahara, Nakayama, Naka-machi, Naka-gun, Ibaraki Prefecture 1 At Naka Research Institute, Japan Atomic Energy Research Institute (72) Makoto Sugimoto, Naka-machi, Nakamachi, Naka-gun, Ibaraki Prefecture 1 Japan Atomic Energy Research Institute Naka Research Institute

Claims (6)

[Claims] 1. In a forced refrigeration type superconducting conductor containing a superconducting wire, a cooling path, a stabilizing material, an insulating member, etc. in a conduit, a cooling pipe for flowing the cooling material at the time of conduit welding is provided at a portion adjacent to the welded portion. A forced refrigeration type superconducting conductor. 2. The forced refrigeration type superconducting conductor according to claim 1, wherein the cooling pipe is a normal electric conduit. 3. The forced refrigeration type superconducting conductor according to claim 2, wherein the normal electric conduit is used as a liquid helium flow path after the conductor is completed. 4. The forced refrigeration type superconducting conductor according to claim 3, wherein the normal conduit is made of copper or aluminum having a low resistance so that the normal conduit serves as a stabilizer after the conductor is completed. A forced refrigeration type superconducting conductor characterized by being used. 5. A welding method in which the forced-freezing type superconducting conductor according to claim 1 is used to perform complete penetration welding of a conduit while flowing a coolant into a normal electric conduit adjacent to a welded portion. 6. A method for producing a superconducting conductor using the welding method according to claim 5.