JPH0762712B2 - Nuclear fusion device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fusion device, and more particularly to a magnetic field confinement type fusion device that confines fusion plasma by a magnetic field.

[Conventional technology]

Conventionally, a current introduction terminal for supplying a current to a coil used in a nuclear fusion device or the like is a metallization + brazing insulator or a cylinder made of an insulating material such as alumina ceramics or epoxy resin around a through conductor through which a current flows. It is often used with a structure that is attached or attached with a polymer resin,
Some of them are supplied as standard products from Ceramaseal (USA) (Catalog 6910 HVF, etc.).

[Problems to be solved by the invention]

The prior art described above recognizes that the creeping withstand voltage characteristic in the high vacuum region is equal to or higher than that in the atmosphere, and therefore the vacuum side conductor is not covered with the solid insulation, and the withstand voltage is increased by taking the creeping distance. Due to the structure provided, there is a problem that the withstand voltage of the current introducing terminal itself is lowered when the creeping withstand voltage characteristic is deteriorated by applying a magnetic field or the like.

The present invention has been made in view of the above points, and an object thereof is to provide a fusion device having a high withstand voltage current introduction terminal, which is not affected by a decrease in creeping withstand voltage due to application of a magnetic field. is there.

[Means for solving problems]

The above-mentioned purpose is an epoxy-based solid insulator for the atmosphere side and the superconducting coil side of the charged portion in the adiabatic vacuum container of the current introduction terminal,
This is achieved by covering the both with a polyester-based solid insulator so that the ends overlap.

[Action]

The withstand voltage characteristic of the solid insulator covering the vacuum side portion of the conductor has a constant value regardless of the presence or absence of an atmosphere or a magnetic field. Therefore, the withstand voltage characteristic of the current introducing terminal on the vacuum side is determined by the characteristic of the solid insulator and does not deteriorate due to application of a magnetic field or the like.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in the figure, the vacuum container wall 1 in this embodiment separates the upper vacuum part and the lower atmospheric part, but the penetrating conductor 2 penetrating this is a solid insulation A, such as an epoxy type ( It is covered with 3) and is vacuum-sealed by a rubber O-ring at the vacuum seal portion 5. The vacuum side of the through conductor 2 is covered with a solid insulation C, for example, an epoxy system (6) on the upper side of the drawing,
The brazing part 7 at the time of assembly is also completely covered with the solid insulation B, for example, polyester (4) after assembly.

As described above, according to the present embodiment, the vacuum side portion of the conductor is completely covered with the solid insulations A, B, and C, and is not affected by the decrease in creeping withstand voltage due to the magnetic field application because the metal is not exposed, It has the effect of having stable withstand voltage characteristics.

〔The invention's effect〕

According to the fusion device of the present invention described above, the atmosphere side and the superconducting coil side of the charged portion in the heat insulating vacuum container of the current introduction terminal are epoxy-based solid insulators, and the polyester-based solid insulator between them. Since the end part is covered so that it overlaps, the vacuum side part of the conductor is completely covered by the solid insulator and there is no exposed metal part. Since it is not affected by the decrease in creepage withstand voltage, it can have a high withstand voltage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a current introducing terminal portion showing an embodiment of the present invention. 1 ... Vacuum container wall, 2 ... Penetration conductor, 3 ... Solid insulation A, 4 ... Solid insulation B, 5 ... Vacuum seal part, 6 ... Solid insulation C, 7 ... Brazing part.

Claims (1)

[Claims] 1. A superconducting coil maintained at a cryogenic temperature, an adiabatic vacuum container for accommodating the superconducting coil and thermally insulating the superconducting coil from a room-temperature atmospheric space by vacuum, and the superconducting coil provided in the adiabatic vacuum container from In a nuclear fusion device having a current introducing terminal for introducing an electric current, the atmosphere side and the superconducting coil side of the charged portion in the adiabatic vacuum container of the current introducing terminal are made of an epoxy-based solid insulator, and a polyester type material between them. A fusion device characterized by being covered with the solid insulator of 1 above so that the ends overlap.