JPS5814999B2 - Toroidal magnetic field generator for torus-shaped fusion device - Google Patents

Description

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

Generally, a toroidal magnetic field generator of a torus-shaped fusion device generates a toroidal magnetic field by passing a large current in the same direction through multiple coils arranged on a torus circle.

The interaction between this magnetic field and the coil current generates a strong electromagnetic force in the toroidal coil.

This electromagnetic force includes a hoop force, a force that attempts to gather all of the multiple toroidal coils toward the center (centripetal force), and a force that attempts to topple the coils.

In toroidal magnetic field generators, the problem is how to support the electromagnetic force acting on the coil and how to reduce the stress generated in the coil.

As shown in Figures 1 and 2, conventional devices are small in size and have a small aspect ratio.
In response to the centripetal force having the largest value among the electromagnetic forces, the toroidal coil 1 only needs to be fixed to the frame 3 with the tightening bolt 4 provided on the coil frame 2.

However, as nuclear fusion experimental devices have grown in size in recent years, the structure shown in Figure 1 has become unable to withstand strong electromagnetic force.

Therefore, as shown in FIG. 3, a structure has been developed in which a wedge-shaped spacing member 5 is installed, thereby absorbing the centripetal force over a wide area.

However, in this structure, since the spacing member 5 is in contact with the vacuum vessel, various measurement ports, and the plasma injection part (none of which are shown), it is necessary to cut out or drill holes to avoid these parts. It was difficult to obtain support.

In addition, it is extremely difficult to bring the spacing member 5 into close contact with the coil 1 in advance, and in other words, the protection of the device becomes abnormally thick (in addition, the device is As the spacing member 50 becomes larger in size, the weight of the spacing member 50 becomes extremely large.

This invention was made in view of the above-mentioned circumstances, and when assembling the device, a plurality of support frames containing toroidal coils are accurately gathered radially with the inner sides facing the center.
By pressing the wedge-shaped surfaces formed on both sides of the inner sides of each support arm into close contact with each other and fixing them with non-magnetic, non-conductive retaining rings, the centripetal force generated when energizing is absorbed by the wedge of the coil frame. To provide a toroidal coil magnetic field generating device that accurately transmits magnetic field through a shaped surface, has a simple structure, has a toroidal coil accurately assembled in the center, and can withstand strong electromagnetic force without producing an unbalanced force. The purpose is to

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a partial top view of a toroidal magnetic field generating device using a D-shaped toroidal coil, and FIG. 5 is a partial side view of FIG. 4.

Although the figure shows a D-shape, the coil may have a circular shape or other various shapes.

The coil support frame 7 is strongly made of non-magnetic steel or the like so as to withstand and support the coil 1's own weight, thermal stress, centripetal force, and other electromagnetic forces, and has a uVv-shaped lower support 7a.
and an upper support member 7b which is shaped like a "T".

7c is a connecting member.

Furthermore, as shown in FIG. 4, by bringing the wedge-shaped surfaces 11 formed on both sides of the inner side of the support frame 7 into close contact with each other at the center, a structure is created in which the centripetal force Fr and the tilting force F are taken care of. There is.

A retaining ring 8 is firmly fitted to the lower protrusion 7d of the support frame 7, and a retaining ring 9 is firmly fitted to the upper protrusion 7e.

By accurately assembling the retaining rings 8 and 9 into the support frame I, the centripetal force Fr is correctly transmitted to the wedge-shaped surface 11 of the support frame T, thereby providing resistance.

10 is a tightening bolt, 12 is a frame, and 13 is a holding plate.

In addition, F and R are adjusted so that eddy current products do not occur in the retaining rings 8 and 9 due to the alternating magnetic flux caused by the energization of the toroidal coil 1.
, P (plastics reinforced with glass fiber), etc., are used.

The assembly procedure using the retaining rings 8 and 9 is as follows.

(a) A support frame I holding a plurality of toroidal coils 1 therein is placed on a pedestal 12.

(b) Place the support rods (7) one after another near the center using a jack or the like.

←→ Each wedge-shaped surface 11 of all support frames 7 is brought into close contact with each other.

b) Tighten the support frame 7 to the frame 12 with the tightening bolts 10.

(e) The retaining rings 8 and 9 are hardened by shrink-fitting them to the support frame 7, or by cooling and fitting the protrusions 7d and 7e sides.

The toroidal magnetic field generator, which is assembled by arranging multiple pieces closely in the torus direction in the above manner with the inner side toward the center, is assembled before the coil 1 is energized, that is, before electromagnetic force acts on it (rust-like surface A preload force is applied to the coil support frame 7, and the force can be distributed accurately through the coil support frame 7.

As described above, according to the present invention, it is possible to assemble the device by applying a preload accurately at the time of assembly, so it can be supported even against strong electromagnetic force, and the toroidal coil does not move or fall in the radial direction. do not have.

Furthermore, the structure is simpler, lighter, and easier to handle than conventional ones, and strong coil support can be obtained.

In addition, due to the tight fitting of the upper and lower retaining rings, a large number of toroidal coils are assembled in a nearly perfect circle, and no irregular magnetic fields or unbalanced forces occur due to this.

Furthermore, since the support structure is unaffected by the vacuum vessel and other parts of the device, it can withstand and easily be disassembled and reconnected several dozen times on-site, making the device easy to use, easy to maintain and inspect, etc. It has many advantages over conventional ones.

[Brief explanation of the drawing]

Figure 1 is a partial top view of a conventional toroidal magnetic field generator.
2 is a sectional view taken along line 1-1 in FIG. 1, FIG. 3 is a partial top view of another conventional toroidal magnetic field generator, and FIG. 4 is a toroidal magnetic field generator according to an embodiment of the present invention. A partial top view, FIG. 5 is a sectional view taken along the line V-■ in FIG. 4. 1...Troidal coil, 7...Support frame, 7a...Lower support, 7b...Upper support, 7d. 7e... Protrusion, 8, 9... Retaining ring,
11... Wedge-shaped surface, 12... Frame.

Claims (1)

[Scope of Claims] A toroidal magnetic field generating device for a torus-shaped fusion device comprising the following elements: (a) A plurality of support rods that hold toroidal coils inside, are arranged radially upright with the inner side toward the center, and are mounted on a pedestal. Both sides of the inner side of each support frame are formed into wedge-shaped surfaces such that adjacent wedge-shaped surfaces are joined to each other. (b) Above and below the inner peripheral side of each support frame, respectively.
A plurality of retaining rings made of a non-magnetic, non-conductive material are fitted into the outer diameter side of the protrusion provided below, and bring the support frames toward the center and bring the wedge-shaped surfaces into close contact.