JPS6220517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic coil for a nuclear fusion device, and particularly to a nuclear fusion device in which a plurality of electromagnetic coils wound around a discharge tube are connected via a connecting wire. Concerning the electromagnetic wire ring of the device.

Nuclear fusion devices use a magnetic field to confine plasma inside a discharge tube, but a method is used to stabilize plasma confinement by applying a parallel magnetic field to the discharge tube. An electromagnetic coil is used to provide a parallel magnetic field to the discharge tube. In this case, if a magnetic field that is not parallel to the discharge tube is generated, it will disturb the magnetic field in the discharge tube, which will reduce the compression characteristics of the plasma. For this reason, the opening of the connecting wire that connects the electromagnetic wire rings is extremely important.

One row of conventional electromagnetic wire rings will be explained with reference to FIG. In the figure, a plurality of electromagnetic wire rings 2 are arranged in the circumferential direction so as to surround an annular discharge tube 1.
The electromagnetic wire 2a and the adjacent electromagnetic wire 2b are sequentially connected by a connecting wire 3 in the longitudinal direction of the discharge tube. In this connected state, a one-turn loop is formed. Therefore, in order to cancel this current loop, a method is used in which a rewinding line 4 in the opposite direction is provided as shown in the figure. This prevents the generation of a magnetic field perpendicular to the plane of the paper.

FIGS. 2, 3, and 4 show the conventional electromagnetic wire ring 2 and the lead-out portion of the connecting wire 3. Each figure shows an opening of the electromagnetic wire 2, a connecting wire 3 for connecting the adjacent electromagnetic wire, and a rewinding wire 4 for canceling the current flowing through the connecting wire 3. However, part a in Figure 2, part b in Figure 3, and c in Figure 4
As shown in the figure, there is a part where the connecting wire's leading part and the unwinding line do not overlap, and it is not possible to completely cancel out a part of the electromagnetic wire loop's leading part. Therefore, there is a magnetic field perpendicular to the plane of the paper, and it is not possible to obtain only a magnetic field completely parallel to the discharge tube, resulting in unstable plasma containment.

The present invention has been made in view of the above points, and its purpose is to provide an electromagnetic coil for a nuclear fusion device that generates only a magnetic field parallel to the discharge tube and reliably confines plasma. .

In the present invention, the opening portion of the connecting wire connecting adjacent electromagnetic wire rings is placed on the electromagnetic wire ring, and the connecting wire generates a magnetic field for canceling the magnetic field generated by the current flowing through the connecting wire. The intended purpose is achieved by matching the unwinding line width.

The present invention will be described in detail below based on embodiments shown in the drawings. Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 5 is an embodiment of the present invention, and is a diagram showing a state in which an electromagnetic wire ring 2 disposed around an annular discharge tube is taken out.

In the embodiment shown in the figure, the boundary of the outlet of the connecting wire 3 drawn out from one electromagnetic wire ring 2 to the electromagnetic wire rings (not shown) on both sides thereof is on the electromagnetic wire ring 2,
Moreover, the width of the connecting line 3 is made to match the width of the unwinding line 4. With this configuration, the connection line 3
Since it can be placed at the same position as the unwinding line 4, it is possible to cancel the magnetic field perpendicular to the plane of the paper and obtain only the magnetic field completely parallel to the discharge tube, ensuring plasma confinement. It can be carried out.

FIG. 6 shows another embodiment of the invention. The embodiment of the figure has a connecting wire 3 connected to an adjacent electromagnetic wire ring.
The boundary part of the outlet part is formed in a diagonal shape, and this also allows the connection line 3 and the unwinding line 4 to match, so that the same effect as the above-mentioned embodiment can be obtained. .

Up to now, we have shown the case where the discharge tube is simply formed in a ring shape on the same plane, and an electromagnetic wire ring is arranged around it, but as shown in Fig. 7, the discharge tube 1
is a method of connecting an electromagnetic wire (the locus of the center of the electromagnetic wire is shown as 8) in which the electromagnetic wire 2 moves in the radial direction of the torus with respect to the torus center axis 7, and rotates up and down perpendicular to the plane of the paper. is even more effective. FIG. 8 shows two adjacent electromagnetic wire rings 2. In the figure, an electromagnetic wire ring 2a and an adjacent electromagnetic wire ring 2b are connected by a connecting wire 3.

Since the electromagnetic wire moves around the discharge tube while rotating as described above, the connecting wire 3 and the unwinding wire 4 must be connected along the advance angle θ of the electromagnetic wire. Therefore, if the opening part of the electromagnetic wire ring is formed in a diagonal shape 6, the connecting wire 3 and the unwinding wire 4 can be easily connected.
can be easily installed and can only generate a magnetic field parallel to the discharge tube.

As explained above, according to the electromagnetic coil of the nuclear fusion device of the present invention, the connecting wire and the opening portion that connect adjacent electromagnetic coils are on the electromagnetic coil, and the connecting wire is unwound with a wire width. Since they are matched, the connecting wire and the unwinding wire can be placed in the same position.
Since the magnetic field generated by the connecting wire can be completely canceled out, the plasma can be reliably confined without degrading the compression characteristics that confine the plasma within the discharge tube.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing the arrangement of electromagnetic wires of the fusion device, and FIGS. 2, 3, and 4 are partial plan views showing conventional examples of the connection wire arrangement in one electromagnetic wire. , FIG. 5 shows a second embodiment of the present invention.
FIG. 6 is a diagram corresponding to FIG. 2 showing another embodiment of the present invention, and FIG. 7 is a diagram showing still another embodiment of the present invention, in which the arrangement state of the electromagnetic wire ring is illustrated. FIG. 8 is a partial perspective view and a partial plan view showing the arrangement of connecting wires in the electromagnetic wire used therein. 1...discharge tube, 2, 2a, 2d...electromagnetic wire ring,
3...Connection line, 4...Rewind line.

Claims (1)

[Claims] 1. An annular discharge tube containing plasma;
A plurality of electromagnetic wire rings are wound around the discharge tube at approximately equal intervals along the longitudinal direction of the discharge tube, and adjacent electromagnetic wire rings are connected by a connecting wire. , in which a rewinding wire is disposed along the connecting wire to generate a magnetic field for canceling a magnetic field generated by a current flowing through the connecting wire, and the outlet portion of the connecting wire is located above the electromagnetic wire loop. An electromagnetic wire ring for a nuclear fusion device, wherein the connecting wire has a width that matches the unwinding wire width. 2. Claims characterized in that the boundary portion of the connection line drawn out from one electromagnetic wire ring to the electromagnetic wire rings on both sides thereof is on the electromagnetic wire ring and is oblique. The electromagnetic ray ring of the nuclear fusion device according to item 1.