JPS59231469A - Nuclear fusion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a nuclear fusion device, and particularly relates to a voloidal coil arranged on the inner and outer circumferential sides of a torus in order to control or heat the Blaze 7. The present invention relates to a nuclear fusion device suitable for a nuclear fusion device that employs a fractional turn method in which the torus is divided midway in the circumferential direction and the voloidal coils on the inner and outer circumferential sides of the torus are connected via transition parts at the divided ends.

[Background of the invention]

In general, a nuclear fusion device, as shown in FIGS. 1 and 2, includes an annular plasma discharge tube 2 that houses a plasma 1 therein, and a plasma discharge tube 2 that surrounds the plasma discharge tube 2 and that has a 1. a plurality of toroidal coils 3 arranged at predetermined intervals, and confining the plasma 1 within the plasma discharge tube 2 by the generated magnetic field; It is generally composed of poloitile coils 4 and 5 that perform heating and the like by the generated magnetic field. Note that 6 is a current transformer coil.

By the way, the plasma discharge tube 2 is usually divided into two parts as shown in FIG. 3(a), and this consists of two semicircular parts as shown in FIG. 3(b). Then, a toroidal coil is installed in each of the two divided plasma discharge tubes 2, and then the two divided plasma discharge tubes 2 are assembled.
It is formed into an annular shape by abutting the divided ends of the two.

Therefore, in such a configuration, the voloidal coil 5 wound in the space between the plasma discharge tube 2 and the toroidal coil 3
Because it cannot be assembled in one piece in a continuous torus, it is constructed using a method called fractional turn.

This fractional turn method means that, like the plasma discharge tube 2, the voloidal coil 5 is also an inner voloidal coil placed on the inner periphery of the torus of the plasma discharge tube 2 at the dividing end of the plasma discharge tube 20. 5a and the outer voloidal coil 5b arranged on the outer circumferential side of the torus are divided, and the inner and outer voloidal coils 5a and 5b are electrically connected at the divided end via the cross section 7, and the divided end is semicircular. The plasma discharge tube 2 is assembled into the plasma discharge tube 2 in a state where it is divided into two parts. In this state, when the two divided plasma discharge tubes 2 are butted against each other as described above, the boroidal coil 41) portion 7 is formed so that the convex portions 7 of the adjacent boroidal coils 5 are mutually connected to each other, as shown in FIG. They are in an overlapping state, and when viewed from the entire device, the result is the same as in the case of continuous winding in a torus shape.

However, when the above-mentioned fractional turn method is adopted, the direction of the current flowing through the transition section 7 is reversed in the two overlapping coil transition sections 7, as shown by arrow I in Fig. 4, and in this state, the toroidal coil When the generated magnetic threat Bt crosses the transition portion 7, an electromagnetic force FT is generated in the transition portion 7 in the normal direction to the coil transition portion 7, as shown in FIGS. 5 and 6. Since the magnetic forces FT are generated in opposite directions, conventionally the two overlapping coil transition portions 7 were bound with glass fibers 9 or the like to support the transition portions 7 against the electromagnetic force FT.

However, the toroidal coil 3 is located outside the transition section 7.
is arranged, and two divided plasma discharge tubes 2
After butting them together, tying the transition portion 7 between the gap between the toroidal coil 3 and the toroidal coil 3 requires a large space for the work, resulting in very poor work efficiency and reliability problems.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and its first purpose is to reduce the working efficiency even if the voloidal coil is disposed between the toroidal coil and the plasma discharge tube. The second purpose is that the transition part can be supported from electromagnetic force without any damage.
In addition to the above object, it is an object of the present invention to provide a nuclear fusion device which solves the strength problem of the support part of the boroidal coil transition part.

[Summary of the invention]

In the present invention, voloidal coils arranged on the inner circumferential side and the outer circumferential side of the torus along an annular plasma discharge tube that confines and retains plasma inside are divided in the middle in the circumferential direction, and the inner circumferential coil is separated at the dividing end. In addition to the above configuration, a support is provided near the plasma discharge tube where the poloidal coil transition part to which the outer peripheral side coil is connected is located, and the support supports the poloidal coil transition part. The second purpose is achieved by fixing the support to the plasma discharge tube with a dovetail key.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the illustrated embodiments. In addition, the same symbol is used for the month "7" which is the same as in CIYE.

I) J': An embodiment of the present invention is shown in Fig. 7 and Fig. ①8.

Since the general structure of the nuclear fusion device δ in this embodiment is almost the same as that of the conventional device, a detailed explanation will be omitted here and only the parts related to the present invention will be explained.

As shown in the figure, in this embodiment, a support 1 is placed near the plasma discharge tube 2 where the crossing point 7 of the voloidal coil 5 is located 1〆L.
0 is provided, and this support 10 supports the transition portion 7 of the voloidal coil 5. The structure of this support 10 and how the transition portion 7 is supported by the support 10 will be explained using FIGS. 9 and 10 v1].

As shown in FIG. 9, the supports have an inverted cross section and are attached to each of the divided ends of the plasma discharge g2 in an inverted shape. The inverted-shaped support 10a supports the coil transition part 7a located on the upper side when the transition parts of adjacent voloidal coils are overlapped, and the other inverted-shaped support 10b supports the overlapping transition parts. When combined, they support the coil transition portion 7b located on the lower side. When the divided ends of the plasma discharge tube 2 are butted together in this state, the inverted-shaped supports 10a and 10b are also butted together, as shown in FIG.
The coil transition portions 7a and 7b overlap each other, and
It is configured to be surrounded by inverted-shaped supports 10a1 and 10b.

Therefore, with the configuration of this embodiment, the coil transition section is supported by the plasma discharge tube by the support, so it can sufficiently support it even if electromagnetic force is applied. Work, that is, work after fractional turn assembly is eliminated, improving work efficiency, and even in a narrow space, sufficient support can be provided, which has the effect of improving reliability.

Other examples of support configurations are shown in FIGS. 11 and 12. As shown in the figure, support for this embodiment) 11a and 11
．． b is also written on each of the 20 divided ends of the plasma discharge tube. And each support IIA.

11 () is provided at the tip of the in-n-, both supports 11,
3 and llb are fully connected, and the coil transition portions 7a and 7bk
A spigot is also provided at both ends of the presser plate 120.
．． Push one part of the presser plate 12 into one support lla. In this case, when the transition parts of the adjacent voloidal coils are overlapped, the coil ridge part 7a, which is placed upright on the upper side, is supported by the coil ridge part 7a, and the other part 11a is
When the crossing p parts are overlapped, the coil crossing part 7b located on the lower side is supported. When the divided ends of the plasma discharge tube 20 are butted against each other in this state, as shown in FIG. overlap each other, and the surroundings are supports 11a.

11b1 and a holding plate 12.

Even with such a configuration, the effect is similar to that of the above-mentioned embodiment, and in this embodiment, the presser plate 12, support iia,
Since there is no rigid connection between llb and llb, it can be bent. Note that the holding plate 12 has iFl on the cross section of the plasma discharge tube 2.
By forming a cylindrical continuous body, all the electromagnetic force generated in the coil transition portion can be supported as a hoop force of the holding plate 12, and reliability can be further improved in terms of strength.

By the way, the plasma emitting TLT tube and the support can be attached by welding, but welding does not allow the coil crossing 9 inside the support to be attached.
There is a risk of thermal deterioration of conductors and insulators, etc.
Generally fixed using bolts.

ing. However, with bolts, the tensile load often exceeds the allowable tensile load, and there is a problem with reliability in terms of strength. That is, since a very large electromagnetic force acts on the support, the support must also be fixed with sufficient strength. The force applied to the fixed part is only tensile force, so to increase the strength, increase the cross-sectional area of the fixed part (2).When fixing with bolts, increase the number of bolts and increase the cross-sectional area: Although it is conceivable to make the diameter thicker, this method requires a large space to attach the pole i, and is not suitable for the configuration of the above-mentioned nuclear fusion device.

The example shown below allows for a large cross-sectional area without requiring a large space for mounting the support, and is intended to solve the strength problem of the fixed portion of the support. That is, as shown in FIGS. 13 and 14, the inverted-shaped sabot) 1
0a and 10b are fixed to the divided ends of the plasma discharge tube 2 by dovetail keys 13. The shape of this dovetail key 13 is shown in FIG. 15, and it is interposed in a dovetail groove provided across the inverted sabots 10a, 10b and the plasma discharge tube 2.

In this way, when the dovetail key 13 is fixed to the plasma discharge tube, the electromagnetic force of the dovetail key 13 is
The cross-sectional area A(-) subjected to this is expressed as A=LXW. The length of the dovetail key 13, length L, can be increased up to the thickness of the support, so that the electromagnetic force F
The cross section that receives T can be greatly increased, and the strength of the fixed part of the support is improved.

〔Effect of the invention〕

According to the nuclear fusion device of the present invention described above, the voloidal coils, which are arranged on the inner circumferential side and the outer circumferential side of the torus along the annular plasma discharge tube that confines and holds plasma inside, are divided in the middle in the circumferential direction. A support is provided in the vicinity of the plasma discharge tube where the poloidal coil bridge 9 is located where the inner and outer coils are connected at the split end, and the support supports the poloidal coil bridge. Because of this, there is no work to be done after fractional turn assembly, improving work efficiency, and even if electromagnetic force is applied, the transition portion of the voloidal coil is supported by the support, resulting in high reliability. Furthermore, by fixing the support to the plasma discharge tube with a dovetail key, in addition to the above-mentioned effects, the strength of the fixed part of the support is improved,
It is possible to obtain this type of nuclear fusion device with further increased reliability.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing a general tokamak-type nuclear fusion device, Figure 2 is a plan view of Figure 1 partially showing
Figure (a) is a plan view showing a state in which a fractional turn type poloidal coil is wound along a divided plasma discharge tube, Figure 3 (b) is a front view of the divided end in Figure 3 (a), Figure 4 is a perspective view of a voloidal coil transition section that uses the fractional turn method, Figure 5 is a front view of a conventional example supporting the voloidal coil transition section, and Figure 6 is the same as that of Figure 5. FIG. 7 is a front view showing an example of supporting the boroidal coil transition portion in the present invention, FIG. 8 is a plan view of the vicinity of the split end, and FIG. 9 is a cross-sectional view of the transition portion adopted in the present invention. FIG. 10 is a cross-sectional view of FIG. 9 after assembly, and FIG. 12 is a cross-sectional view of the assembly shown in FIG. 11, FIG. 13 is a cross-sectional view showing an example of fixing the support to the plasma discharge tube, and FIG. 14 is a cross-sectional view of the boroidal coil transition section of FIG. 13. The sectional view, FIG. 15, is a perspective view of the dovetail key employed in the examples of FIGS. 13 and 14. 1... Plasma, 2... Plasma discharge tube, 3...
Toroidal coil, 5... Voloidal coil, 5a-
... Poloidal coil on the inner circumference side of the torus, 5b... Poloidal coil on the outer circumference side of the torus, 7.7a, 7b... Voloidal coil transition section, 10. Ila,llb...Support, 1.08. 10 b...Inverted support, 12 J Figtano/4th m

Claims (1)

[Claims] ■. An annular plasma discharge tube that confines and holds plasma inside, a plurality of toroidal coils surrounding the plasma discharge tube and arranged at predetermined intervals in the circumferential direction of the torus, and between the toroidal coil and the plasma discharge tube. and arranged along the plasma discharge tube,
and a voloidal coil that controls or heats the plasma, and the voloidal coil is arranged on the inner circumferential side and the outer circumferential side of the torus, and each of the voloidal coils is divided in the middle in the circumferential direction, and the divided end In a nuclear fusion device formed by connecting the inner circumference side coil and the outer circumference side coil through a transition part at a part, and stacking adjacent said transition parts on top of each other, the plasma discharge where the poloidal coil transition part is located. A nuclear fusion device characterized in that a support is provided near the tube, and the transition portion of the boroidal coil is supported by the support. 2. The plasma discharge tube is divided into two along the circumferential direction of the torus, and the voloidal coil is divided at substantially the same position as the divided portion of the plasma discharge tube. The described fusion device. 3. The support is attached to each of the split ends of the plasma discharge tube in an inverted shape, and one side of the inverted support is attached to the upper side with the adjacent voloidal coil transition portions overlapped. The other inverted '4-shaped Zabot supports the lower coil transition part, and when the divided ends of the plasma discharge tube are brought together, the coil transition part 9 is supported. 3. The nuclear fusion device according to claim 2, wherein the parts overlap each other, and the periphery thereof is covered by each of the inverted-shaped supports. 4. The support is attached to each of the split ends of the plasma discharge tube, and one of the supports supports the coil span 9 section located on the upper side in an overlapping state of the split voloidal coil span υ section, and the other support The lower coil transition part is supported by the support, and the two supports are connected by a presser plate, so that when the divided ends of the plasma discharge tube are butted together, the coil 1-deficient part is mutually connected. overlap, and
1. The nuclear reel fitting device according to item 2, wherein the first frame is formed so as to cover the periphery with the valley support and the presser foot. 5゜Install a spigot at the bleached joint between the 1st leg and the support r-f.Attach one end of the presser plate to one of the leeboards through a part of the spigot, and in this state. Claim 111 (IIIi: Nuclear smoker according to claim 4), characterized in that the divided, Iji, and i parts of the plasma radiation tube are butted against each other and the other end of the presser plate is attached to the other support. 6. The nuclear fusion device according to claim 4 or 5 of patent claim A, characterized in that the holding plate is formed of a cylindrical continuous body. 7. Contains and maintains plasma inside. an annular plasma discharge tube; a plurality of toroidal coils surrounding the plasma discharge tube and arranged at predetermined intervals in the same direction of the toroid; and between the toroidal coil and the plasma discharge tube; A voloidal coil is arranged next to the plasma discharge tube and performs control and heating of the plasma, and the voloidal coil is arranged on the inner and outer sides of the torus. , each of them is divided in the middle in the circumferential direction, and at the divided end, the inner coil and the outer coil are connected via a transition portion, and the adjacent transition portions are connected to each other. In the nuclear fusion device + i-juice that is formed in an overlapping manner, a support is fixed with a dovetail key in the vicinity of the poloidal coil encircling portion of the plasma discharge tube in one row, and the support supports the 7) history portion of the voloidal coil with the support. 8. The nuclear fusion device according to Patent No. 7, characterized in that the dovetail key is interposed in a dovetail groove formed across both the support and the plasma discharge tube. fusion device.