JPS5945112B2 - nuclear fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device, and particularly to a nuclear fusion device that requires many ports for vacuum evacuation, plasma diagnosis, plasma heating, etc.

Generally, a nuclear fusion device that confines plasma using a magnetic field consists of a vacuum vessel that confines the plasma, toroidal/poloidal coils that generate a magnetic field for confinement and heating, etc.
and external forces on these parts (atmospheric pressure applied to the vacuum container)
It consists of a support, base, frame, etc. that supports the electromagnetic force.

An example of such a nuclear fusion device is shown in FIG.

In the example shown in FIG. 1, a toroidal coil 2 surrounds a toroidal vacuum vessel 1, and a plurality of toroidal coils 2 are arranged at predetermined intervals in the circumferential direction of the torus.
is placed outside of it.

The toroidal coil 2 is fixed to a base 5 via a support 4.

Vacuum container 1 and Boroidal Col/! /3 also has support, but is omitted in Figure 1.

The plasma 6 is confined and heated in the vacuum vessel 1 by the magnetic fields of the toroidal coil 2 and poloidal coil 3 and the current induced in the plasma 6 by the poloidal coil 3.

On the other hand, in nuclear fusion devices, the inside of the vacuum vessel is evacuated to a high vacuum, the state of the plasma is diagnosed by injecting microwaves or laser light into the plasma, and the plasma is heated by injecting high-speed neutral particles. There are many windows (hereinafter referred to as ports) in order to

) is usually provided in a vacuum container.

FIG. 2 shows an example of such a port.

Here, components other than the vacuum vessel 1 and toroidal coil 2 shown in FIG. 1 are omitted.

In general, in a nuclear fusion device having a toroidal coil 2, the port 7 comes out from the gap between the toroidal coils 2, but since it is necessary to make the magnetic field uniform, the toroidal coils 2 should be made as wide as possible and as large in number as possible. desirable.

Furthermore, in reality, as shown in FIG. 1, because of the presence of the poloidal coil 3, supports, etc., the area on which the ports can be attached is considerably smaller than the entire surface of the vacuum vessel.

In complex devices such as stellarators and heliotrons that have a spiral helical coil on the outside of the vacuum vessel, the room for installing ports becomes even narrower.

Figure 3 shows an example of a vacuum exhaust port.

A manifold 9 is attached to the evacuation port 8, and a vacuum pump (not shown) is attached to the part indicated by the arrow for evacuation.

Since the vacuum evacuation ability improves as the size of the evacuation port 8 increases, the evacuation port 8 is provided on the outer circumferential side of the vacuum vessel 1 (on the right side in Fig. 3) where the geometrically largest port is attached. is the most economical.

However, although large ports are generally required for plasma diagnosis and heating, there is a limit to the number of large diameter ports due to the strength of the vacuum container and the pace of winter. They either sacrificed the exhaust performance by attaching the 250mm to other small ports or degraded the plasma diagnostic/assistance performance.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a system that does not sacrifice vacuum evacuation performance even when the number of large-diameter ports is small compared to the requirements for evacuation, diagnosis, heating, etc.
The present invention provides a nuclear fusion device that can perform plasma diagnosis and plasma heating well.

The present invention is characterized in that it includes a toroidal vacuum vessel that confines plasma, an exhaust port provided at a predetermined position on the outer periphery of the vacuum vessel, and a manifold attached to the exhaust port. , an observation port is provided on a wall of the manifold that is substantially horizontal to the exhaust port.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a partial cross-sectional view of the nuclear fusion device according to the present invention,
An observation port 10 is attached to the manifold 9 at a position substantially horizontal to the evacuation port 8.

This observation port 10 is located at a position that allows the inside of the vacuum vessel 1 to be seen through, and can be effectively used for plasma diagnosis and plasma heating if necessary.

As described above, the nuclear fusion device of the present invention includes a toroidal vacuum vessel that confines plasma, an exhaust port provided at a predetermined position on the outer circumference of the vacuum vessel, and a manifold attached to the exhaust port. In the nuclear fusion device having the present invention, an observation port is provided on a wall that is substantially horizontal to the exhaust port of the manifold,
A nuclear fusion device that can effectively use a limited number of large-diameter ports and meets the requirements for plasma diagnosis and heating without sacrificing vacuum pumping performance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an overview of a nuclear fusion device, Fig. 2 is a perspective view of the nuclear fusion device, Fig. 3 is a side view explaining the prior art, and Fig. 4 is a cross-sectional view explaining the present invention. be. Explanation of symbols, 1... Vacuum container, 8...
Vacuum exhaust port, 9... Manifold, 10.
...Observation port.

Claims (1)

[Claims] 1. In a nuclear fusion device having an exhaust port provided at a predetermined position on the outer periphery of the vacuum vessel to a toroidal vacuum volume that confines plasma, and a manifold attached to the exhaust port, the exhaust of the manifold A nuclear fusion device characterized by having an observation port on a wall that is almost horizontal to the observation port.