JPH0318158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device, and particularly to a structure of a transition portion of a poloidal magnetic field coil.

A nuclear fusion device creates a magnetic field wall in a vacuum container and confines plasma within the magnetic field wall, and there are various types depending on the method of generating this magnetic field.
For example, in a torus-shaped fusion device, a magnetic field is applied along the circumferential direction of the vacuum vessel using multiple toroidal magnetic field coils wound around the vacuum vessel to generate plasma inside the vacuum vessel. In addition, various poloidal magnetic field coils arranged concentrically with the vacuum vessel generate a circular magnetic field to control the position of the plasma.

By the way, in a small toroidal fusion device of this type, the poloidal magnetic field coil 1 is usually placed outside the toroidal magnetic field coil 3 surrounding the vacuum vessel 2, as shown in FIG. be. Note that in the figure, the line CC indicates the center of the torus. Therefore, since the space occupied by the poloidal magnetic field coil 1 can be relatively large, there is no need to pay special consideration to its structure.

However, when it comes to a large-sized device that generates a strong magnetic field, the structure shown in FIG. 1 increases the size of the entire device, which is not a good idea from both a structural and cost standpoint.
Therefore, as shown in FIG. 2, poloidal magnetic field coils 1A, 1B, etc. are arranged by effectively utilizing the air space between the vacuum container 2 and the toroidal magnetic field coil 3. When placed,
There are the following spatial problems:

In other words, various poloidal magnetic field coils are arranged according to their respective purposes in consideration of magnetic field distribution for plasma control, but in order to effectively utilize the space in the same type of poloidal magnetic field coils,
For example, the coils 1A to 1B are connected in sequence.
FIG. 3 is an enlarged perspective view of this connecting portion, and FIG. 4 is a view taken along arrow A in FIG. 3. As can be seen from these figures, at the transition part X where the ends 1a and 1b of the two coils 1A and 1B arranged on the same horizontal plane are connected by the crossover wire 4, compared to other parts, An extra space corresponding to the height h for one turn is required, and if the unwinding wire 5 for canceling unnecessary magnetic fields due to current at the transition section is also taken into consideration, an extra space equal to the height dimension equivalent to approximately 2 turns is required. Is required. In other words, the transition part X between each coil requires an extra space with a height of at least one turn compared to other parts, so the poloidal magnetic field coil is installed in the narrow space between the vacuum vessel 2 and the toroidal magnetic field coil 3. 1 is difficult to effectively arrange, and the control characteristics of the coil 1 are deteriorated.

An object of the present invention is to provide a nuclear fusion device that eliminates the drawbacks of the prior art described above and can reduce the space occupied by the transition section that connects poloidal magnetic field coils arranged on the same horizontal plane.

In order to achieve this purpose, a slope cutout is formed in one of the two poloidal magnetic field coils arranged on the same horizontal plane, and a crossover wire connecting the other poloidal magnetic field coil and the one poloidal magnetic field coil is formed. An inclined surface along the inclined surface of the inclined cut-off part is disposed such that an end thereof faces the slope of the inclined cut-off part, and a slope surface along the slope of the inclined cut-off part is provided at a portion of the crossover line that faces the slope of the inclined cut-off part. It is characterized by the formation of

Hereinafter, the present invention will be described with reference to illustrated embodiments.

FIG. 5 is a perspective view of a transition section in a poloidal magnetic field coil of a nuclear fusion device according to an embodiment of the present invention;
FIG. 6 is a view taken along arrow B in FIG. In these figures, the crossover wire 4, one end of which is connected to the end 1a of one poloidal magnetic field coil 1A, has its other end connected to the inclined stepped portion 6 formed in the turn of the other poloidal magnetic field coil 1B. coil 1
B, and the side of this connection end facing the inclined stepped section 6 is formed in a tapered shape along the inclined surface of the inclined stepped section 6, so that it is almost connected to the inclined stepped section 6. They are arranged so that they are flush.

Therefore, the space with the height of one turn for the crossover wire 4, which was conventionally required, is no longer required.
The space occupied by the transition section can be reduced. As a result, it is possible to effectively utilize the narrow space between the vacuum vessel 2 and the toroidal magnetic field coil 3 to arrange the poloidal magnetic field coil 1, thereby minimizing the irregular magnetic field in the plasma region and improving control characteristics. becomes.

Note that, as in the conventional example, the unwinding wire 5 is also provided at the transition portion in order to cancel out unnecessary magnetic fields caused by the current.

Although the case has been described in which the poloidal magnetic field coil is placed in a narrow space between the vacuum vessel and the toroidal magnetic field coil, the present invention is not limited to this, and the poloidal magnetic field coil is placed in the vacuum vessel and the toroidal magnetic field coil, such as in a small nuclear fusion device. Even when the present invention is arranged outside the toroidal magnetic field coil, it can be similarly applied when trying to reduce the space occupied by the transition portion of the poloidal magnetic field coil.

As explained above, according to the present invention, it is possible to reduce the space occupied by the transition portion connecting between the poloidal magnetic field coils, so that the poloidal magnetic field coils can be A magnetic field coil can be arranged, and control characteristics by the poloidal magnetic field coil can be improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the schematic configuration of a small fusion device, Figure 2 is a cross-sectional view of the right half showing the schematic configuration of a large fusion device, and Figure 3 is a cross-sectional view of a conventional poloidal magnetic field coil. FIG. 4 is a perspective view showing the A section in FIG. 3, and FIGS. is a perspective view, and FIG. 6 is a view taken along arrow B in FIG. 1A, 1B... Poloidal magnetic field coil, 1a,
1b... Coil end, 4... Crossover wire, 6... Inclined step part.

Claims (1)

[Scope of Claims] 1. The fusion device includes an annular vacuum vessel containing plasma and a plurality of poloidal magnetic field coils arranged concentrically with the vacuum vessel, comprising: Among them, at least one of the two poloidal magnetic field coils arranged on the same horizontal plane is formed with an inclined cut-off part, and the end of the crossover wire connecting the other poloidal magnetic field coil and one poloidal magnetic field coil is Arranged to face the slope of the slope cut-off part, and forming an inclined surface along the slope of the slope cut-off part at a portion of the crossover wire that faces the slope of the slope cut-off part. A nuclear fusion device characterized by: