JPS5934990B2 - Toroidal coil of torus-shaped fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a toroidal coil for a torus-shaped nuclear fusion device in which a plurality of coil units are arranged in a torus shape.

In a torus-shaped fusion device, the toroidal coil is arranged around a circumference of several to several tens of coil units 1 surrounding a torus-shaped discharge 'f 2 , as shown in FIG. It is configured to generate a toroidal magnetic field in the discharge tube 2.

In general, when obtaining the same magnetic field with the same torus radius, there is a relationship pocA' between the excitation power supply capacity P and the coil cross section A.

Therefore, as research progresses in recent years, it becomes necessary to increase the cross section of the coil when it becomes necessary to generate a strong magnetic field.

In addition, in tokamak-type fusion devices, which are typical of torus-type fusion devices, the iron core 9 of the current transformer or coil for passing current through the plasma is often installed around the torus center 3. The cross-sectional dimensions of are often limited at the center of the torus.

However, when a conventional pancake-shaped coil unit as shown in FIG. 2 is used, the width of the coil unit cannot be increased due to the relationship with the adjacent coil unit.

For this reason, a toroidal coil is constructed using a sector-shaped coil unit having a fan-shaped cross section as shown in FIG.

However, in this sector-shaped coil unit, since the cross-sectional shape of the conductor constantly changes in the circumferential direction, it is very difficult to manufacture, and it tends to be difficult to manufacture.

The present invention has been made in view of this point, and its purpose is to facilitate the manufacture of a coil unit, increase the utilization of space on the center side of the torus, and provide a relatively small capacity excitation power source. The purpose of the present invention is to provide this kind of toroidal coil that can obtain a strong toroidal magnetic field.

The main point of the present invention is to omit a predetermined turn of the coil conductor located on the outer circumferential side surface of the toroidal coil unit, and to apply an oblique line to the boundary between the outer circumferential surface and the side surface of the coil unit in the portion where the turns of the coil conductor are omitted. This is where insulating spacers are inserted to form a wall surface.

An embodiment of the present invention will be described below.

FIG. 4 shows an embodiment of the toroidal coil unit of the present invention, in which the conductor 7 on the outer circumferential side of the coil unit is omitted by several turns and is formed into a spherical shape.

Note that this omission creates a gap between the conductor 4 and the ground insulator 6 forming the sloped wall surface, which is unfavorable in terms of coil insulation.
Insert.

In addition, in the figure, the code|symbol 5 is strand insulation.

Therefore, by appropriately selecting the number of omitted turns and the width of the coil unit, if the coil unit 8 is arranged in a torus shape as shown in FIG. Since it is possible to avoid contact between Since the space of the current transformer is not reduced in any way, when the toroidal coil of the present invention is applied to a tokamak type nuclear fusion device, the iron core 9 of the current transformer or the coil can be made larger as is.

In addition, unlike sector-shaped coil units, there is no need for troublesome conductor processing or connection of conductors with different cross-sectional shapes, and it is easy to manufacture, not much different from manufacturing a regular pancake-shaped coil unit. In addition, since the width of the coil located on the outer circumferential side of the torus is the same as the width of the coil located on the center side of the torus, sufficient space is secured for plasma observation and assembling the device.

In the embodiment shown in FIG. 4, the coil unit is wound with four turns in the thickness direction, but it goes without saying that the number of turns can be arbitrarily selected according to necessity. As the coil conductor, in addition to the ordinary conductor shown in the drawings, a hollow conductor or a superconductor can also be used.

As explained above, according to the present invention, a predetermined number of turns of the coil conductor located on the outer circumferential side surface of the toroidal coil unit is omitted, and the outer circumferential surface and side surface of the coil unit are formed in the portion where the turns of the coil conductor are omitted. The toroidal coil unit is manufactured by inserting a completely rounded spacer so that a sloped wall surface is formed at the boundary between the toroidal coil units, so when each coil unit is arranged in a torus shape, the space utilization rate on the center side of the torus increases. It is possible to generate a strong magnetic field with a relatively small-capacity excitation power source, and the unit coil can be manufactured easily, which is advantageous when used in this type of coil.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional plan view of a toroidal coil unit of a torus-shaped fusion device using a conventional pancake-shaped toroidal coil unit, and Figure 2 is a partial cross-sectional view of a conventional pancake-shaped toroidal coil unit. figure,
Fig. 3 is a cross-sectional view showing a conventional sector-type toroidal coil unit, Fig. 4 is a partial cross-sectional view showing an embodiment of the toroidal unit used in the present invention, and Fig. 5 is a cross-sectional view showing an embodiment of the toroidal coil unit of the present invention. FIG. 2 is a partially cross-sectional plan view of a toroidal coil unit of a torus-shaped fusion device. Explanation of symbols, 1... Conventional pancake-shaped toroidal unit, 2... Discharge tube, 4...
Coil conductor, 7...Turns to be removed, 8...
...Toroidal unit used in the present invention, 9...
...Current transformer core, 10...Insulator spacer.

Claims (1)

[Claims] 1. In a toroidal coil unit formed by turning a coil conductor in multiple stages vertically and horizontally, a predetermined number of turns are omitted from the coil conductor located on the outer peripheral side surface of the coil unit, and the outer periphery of the coil unit is placed in the portion where the turns of the coil conductor are omitted. A toroidal coil unit characterized in that an insulating spacer is inserted so that an inclined wall surface is formed at the boundary between a surface and a side surface.