JPS5810715B2 - nuclear fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device, and more particularly to a nuclear fusion device equipped with a liner that is divided and provided along the inner surface of a vacuum container to protect the container wall from plasma inside the vacuum container.

Generally, in a nuclear fusion device, as shown in FIGS. 1 and 2, a liner 2 is arranged along the inner surface of the vacuum container 1 so that the plasma 3 inside the vacuum container 1 does not directly hit the inner wall of the vacuum container 1. This liner 2 is supported on the inner wall of the vacuum container 1 by a support 4.

Normally, this vacuum container 1 is constructed by alternately combining thick-walled parts 5 and bellows 6 in order to release thermal expansion and ensure a -turn resistance value. There is a risk that the plasma current will short-circuit through the liner 2 and cause energy loss. Therefore, the liner 2 is divided into 6 parts with bellows 6 to prevent a short-circuit in the liner 2, and the divided liner 2 is inserted into the thick part 5. A liner 2 is supported on the inner surface via a liner support 4, and as shown in FIG.
An uneven liner 8 is arranged in each divided space to prevent the plasma 3 from jumping into the container wall side.

In FIG. 2, A indicates the circumferential direction of the torus, and in FIG. 3, γ indicates a support mounting bolt.

In this way, conventionally, the divided liner 2 is arranged one by one on the thick wall part 5 of the vacuum container 1 and then cut out and installed on the liner support 4. , liner 2 due to radiant heat entering from plasma 3
In order to make the temperature rise uniform, each liner 2 has a nearly rectangular shape.

When the shape of the liner 2 approaches a rectangle, it becomes easier for eddy currents to flow on the surface of the liner 2, which are generated by changes in the magnetic field caused by the flickering of the plasma 3, and this eddy current and toroidal magnetic field couple, causing the liner 2 to A large electromagnetic force is generated, and a large stress is generated in the central fixed portion of the liner 2.

The present invention has been made in view of the above points, and its purpose is to reduce the electromagnetic force generated by the toroidal magnetic field and the current flowing on the liner surface as a secondary circuit of the plasma current, and to provide a highly durable The present invention provides a fusion device equipped with a liner.

The present invention comprises a torus-shaped cylindrical part formed by alternately connecting a plurality of thick-walled parts and bellows, which is provided along the inner surface of a vacuum vessel in which plasma is enclosed, and which is divided into a plurality of parts in the circumferential direction of the torus. The intended purpose is achieved by dividing the liner, which is supported by each of the thick parts via support members, by providing slits in the circumferential direction of the torus.

The present invention will be described below based on embodiments shown in the drawings.

Note that the same reference numerals are used for the same parts as in the past.

FIG. 4 shows an embodiment of the present invention.

Its schematic structure is almost the same as the conventional one, and the liner will be explained here.

As shown in FIG. 4, the liner 2' in this embodiment is divided by providing slits 2'a in the circumferential direction A of the torus, and the divided liner 2' has an elongated shape with liner mounting bolts 9. is attached to liner support 4 with
A liner support 4 is further attached to the thick wall portion 5 with support attachment bolts 1.

The divided portions B of the liner 2' divided by the slits 2'a are sloped as shown in FIG. 5 to prevent the plasma 3 from jumping into the container wall.

Furthermore, in this embodiment, in manufacturing the liner 2', the slit 2
The liner 2' divided at 'a' is further divided in the torus circumferential direction A.
As shown in Fig. 6, this connecting part C connects only the center parts, and the upper and lower parts are separated by a distance T in the circumferential direction A in consideration of thermal expansion. ing.

With this configuration of this embodiment, the liner 2' has an elongated shape in the torus circumferential direction A, which makes it possible to suppress the flow of eddy currents caused by changes in the magnetic field accompanying plasma flashing. This makes it possible to reduce the electromagnetic force acting on the liner 2' and improve the durability of the liner 2', as well as being able to follow thermal expansion.

In the nuclear fusion device of the present invention described above, a plurality of thick-walled parts and bellows are connected alternately to form a torus-shaped cylindrical part, and along the inner surface of a vacuum vessel in which plasma is enclosed, Since the liner is divided into a plurality of parts in the circumferential direction and supported by supporting members in each of the thick parts, the liner is divided by providing slits in the circumferential direction of the torus. It is possible to suppress the flow of eddy currents caused by changes in the magnetic field, reduce the electromagnetic force acting on the liner, and obtain this type of nuclear fusion device equipped with a liner with excellent durability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view schematically showing a nuclear fusion device, Fig. 2 is a plan view thereof, Fig. 3 is a partial sectional view of a vacuum vessel showing a conventional liner arrangement adopted therein, and Fig. 4 is a sectional view of the present invention. FIG. 5 is an enlarged detailed view of section B in FIG. 4, and FIG. 6 is an enlarged detailed view of section C in FIG. 4. 1... Vacuum container, 2, 2'... Liner, 2'a... Slit, 3... Plasma, 4... Liner support, 5
...Thick walled part, 6...Bellows.

Claims (1)

[Claims] 1. A vacuum vessel in which a plurality of thick-walled parts and bellows are alternately connected to form a torus-shaped cylindrical part, and a plasma is sealed inside the vacuum vessel; In the nuclear fusion device, each of the liners is divided by providing a slit in the circumferential direction of the torus, and each of the liners is divided in a circumferential direction of the torus. A nuclear fusion device characterized by: