JPS5848878B2 - Torus type fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torus-type nuclear fusion device, and more particularly to a torus-type nuclear fusion device in which a helical film is wound around a donut-shaped vacuum vessel.

Generally, nuclear fusion devices that confine plasma using a magnetic field are equipped with various electromagnetic coils, but in devices such as stellarator type, heliotron type, and torsatron type,
A helical coil (hereinafter referred to as a helical coil) is placed around the vacuum vessel to surround the plasma.

) plays an important role in generating a magnetic field for plasma confinement, and the magnetic field generated by this helical coil generates and maintains plasma within the vacuum vessel, and current is passed through the plasma to heat it and obtain thermal energy from the fusion reaction.

An electromagnetic force acts on this helical coil when it is energized, but it is structurally difficult to support the electromagnetic force generated in the helical coil from the outside, so it is usually supported by the vacuum container.

On the other hand, when a helical coil is energized, Joule heat is generated in addition to electromagnetic force, and the temperature of the helical coil itself rises and thermally expands.

Therefore, if the helical coil is sufficiently fixed to support the electromagnetic force, thermal expansion due to temperature rise will be suppressed, resulting in increased thermal stress and the helical coil will easily break.

The present invention was made in view of the above points, and its purpose is to increase the durability of the helical coil by reducing thermal stress as well as providing sufficient support against electromagnetic force. To provide a torus type nuclear fusion device.

In the present invention, a helical coil is provided at least on the center side of the torus, where a helical coil coil wound helically around the outer periphery of a vacuum container having a substantially donut shape with plasma confined therein is located so as to cover the helical coil. The intended purpose is achieved by providing a coil support with an arcuate cross section along the winding direction of the vacuum container, and fixing the coil support to a pellet forming a helical groove around the outer periphery of the vacuum container. This is what I did.

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

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In the nuclear diagram, reference numeral 1 denotes a vacuum container formed in a substantially donut shape for confining plasma 2, and this vacuum container 1 is supported by support legs 4 protruding from a lower base 3.

Reference numeral 5 denotes a helical coil coil wound helically around the outer periphery of the vacuum vessel 1. The helical coil 5 is arranged in a helical manner around the outer periphery of the vacuum vessel 1 with the pitch of the helical coil 5. It is wound in a helical groove formed between the edges 6 fixed to the outer periphery of the tube.

In this embodiment, the helical coil 5 is located on the torus center side where the helical coil 5 is located and on the opposite side.
Coil supports 1-7A, which have a substantially arc-shaped cross section, extend along the winding direction of the helical coil 5 so as to cover the outer periphery of the helical coil 5.
Equipped with 7B.

The coil supports h7A and 7B are each fixed to the pellet 6 with bolts or the like, and a portion of the upper surface and a portion of the lower surface of the helical coil 5 in FIG. 1 are uniformly covered by the coil supports 1-7A and 7B. It is outside and exposed.

A plurality of toroidal coils 8 are provided on the outer circumferences of these coil supports 1-7A and 7B at predetermined intervals in the circumferential direction of the torus, and these toroidal coils 8 are fixed to each of the upper base 9 and the lower base 3.

Next, the effects of this embodiment will be explained.

When a vertical magnetic field is formed in the nuclear fusion device shown in Fig. 1 at the start of operation using a separately provided vertical magnetic field coil, etc., and at the same time a large current is started to flow through the helical coil 5, the fusion device shown in Fig. 3 or 4 is generated. As shown in the figure, vector sums F, , F2 of electromagnetic force are generated on the torus center side or on the opposite side, and the helical coil 5 is separated from the vacuum vessel 1 with the vector distribution shown by the arrow in the figure. It acts on

Here, XX indicates the center of the torus.

This vector sum F1 or F2 of electromagnetic force is generated continuously while the plasma 1 is generated and the entire device is put into operation. In this embodiment, this vector sum F1 or F2 of electromagnetic force is generated continuously. Coil support 7A, 7B in direction
is provided, the vector sum of electromagnetic forces F1, F2
The expansion of the helical coil 5 due to
, 7B, the accumulation of internal stress in the helical coil 5 is alleviated because the upper and lower ends of the helical coil are exposed as shown in FIG. Durability increases.

Furthermore, since a large current is applied to the helical coil 5 in a short period of time, the temperature of the helical coil 5 rises adiabatically, and this temperature rise causes thermal expansion of the helical coil 5. As described above, the internal thermal stress within the helical coil 5 is significantly reduced in this case as well, since it is absorbed by the exposed portion of the under-soil end of the helical coil 5.

Therefore, the damage accident of the helical coil 5 caused by the prior art is eliminated, and the durability of the helical coil 5 is significantly increased.

Next, another embodiment will be described based on FIGS. 5 and 6.

In this embodiment, the open end of the coil support 7A or 7B having an arcuate cross section shown in the above-mentioned embodiment is expanded somewhat in accordance with the elongation of the helical coil 5, that is,
The coil supports 8A, 8B, and 8C have inner diameters near the ends of the coil supports 7A and 7B having an arcuate cross section and are larger than the outer diameter of the helical coil 5, and the vector sum of electromagnetic force F1
If occurs only on the torus center side (see Figure 3), then
If the coil support 8A is attached only to the side of the center of the torus of the helical coil 5 as shown in FIG. 5, and the vector sums F1 and F2 of electromagnetic force occur simultaneously, then Coil supports 8B and 8C are respectively mounted on the opposite sides.

The dashed lines in FIGS. 5 and 6 each indicate the position when the helical coil 5 is expanded.

The other configurations are the same as the embodiments shown in FIGS. 1 and 2 described above.

According to this embodiment, in addition to having the same effect as the above-described embodiment, the coil supports }8A, 8B, and 8C are formed in accordance with the expansion of the helical coil 5 due to thermal expansion, etc., so that the coil supports }8A, 8B, and 8C are There is an advantage that the internal stress fault formed at the boundary between a fixed place and a non-fixed place can be smoothed, thereby further increasing the durability of the helical coil 5.

According to the torus-type nuclear fusion device of the present invention explained above,
A coil support having an arc-shaped cross section is provided along the winding direction of the helical coil so as to cover the helical coil at least on the center side of the torus where the helical coil wound in a helical shape around the outer periphery of the vacuum container is located. Since the support is fixed to a pellet that forms a helical groove around the outer periphery of the vacuum vessel, the electromagnetic force acting on the helical coil can be supported by the coil support, and the helical Since the elongation is absorbed in the portion of the coil that is not covered by the coil support, the durability of the Hercal coil can be significantly increased, which is very effective when used in this type of nuclear fusion device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the torus-type nuclear fusion device of the present invention, FIG. 2 is a plan view along line 1--2 of FIG. 1 with a partial cutout, and FIG. 4 are distribution diagrams showing the electromagnetic force generated in the coil of FIG. 1, and FIGS. 5 and 6 are longitudinal sectional views showing a part of the main parts of other embodiments. 1... Vacuum container, 2... Plasma, 5
...Helical coil, 6 ... Pellet, 7A, 7B, 8A, 8B, 8C ... Coil support.

Claims (1)

[Scope of Claims] 1. A vacuum container having a substantially donut shape with plasma confined therein, and pellets arranged helically around the outer periphery of the vacuum container and forming helical grooves between adjacent pellets. and a helical coil wound helically in a helical groove formed between the pellets, at least the center of the torus where the helical coil wound helically is located. A torus-type nuclear fusion device, characterized in that a coil support having an arc-shaped cross section is provided along the winding direction of the helical coil so as to cover the helical coil, and the coil support is fixed to the pellet. 2. The torus-type nuclear fusion device according to claim 1, wherein the inner diameter near the end of the coil support having an arcuate cross section is larger than the outer diameter of the helical coil.