JPS5952997B2 - nuclear fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device, and particularly to a tokamak type nuclear fusion device.

Nuclear fusion is an important energy source for the future.
Development has progressed rapidly in recent years, and various types of nuclear fusion devices have been devised accordingly.

A so-called tokamak-type nuclear fusion device uses a toroidal magnetic field coil to generate plasma in a vacuum vessel, as well as a device that applies Joule heat to heat the plasma in the vacuum vessel to a high temperature, controls the plasma position and shape, etc. A poloidal magnetic field coil, which performs the following functions, is an essential element.

The effect of this poloidal magnetic field coil increases as it is installed closer to the plasma in the nuclear fusion device.

Therefore, the poloidal magnetic field coil is usually placed in the space between the vacuum container and the toroidal magnetic field coil as much as possible due to the configuration of the device.

However, as nuclear fusion devices become larger, the poloidal magnetic field coil is subjected to its own weight as well as the electromagnetic force generated when a large current flows through the coil, which also causes thermal expansion due to Joule heat. How to support this will become a serious issue.

That is, a support device for a poloidal magnetic field coil is required to have a configuration that does not restrict thermal expansion or the like occurring in the coil.

FIG. 1 shows an example of a conventional supporting device for a poloidal magnetic field coil for a tokamak-type nuclear fusion device.

In the figure, the nuclear fusion device includes a vacuum vessel 2 formed in an H-las shape for confining plasma 8 inside, and a plurality of vacuum vessels 2 arranged around the vacuum vessel 2 to generate plasma 8. toroidal magnetic field coils 1, a plurality of poloidal magnetic field coils 13 installed so as to surround the vacuum vessel 2 in the circumferential direction from 1 to -lass in order to apply Joule heat to the plasma 8, and the vacuum vessel 2, Toroidal magnetic field coil 1 and boroidal magnetic field coil 13
It is composed of disk-shaped upper and lower mounts 4 and 5 that support and fix the mounts, and a center column 11 and a plurality of outer support columns 12 that support the upper and lower mounts 4 and 5.

The poloidal magnetic field coil 13 is connected to the annular vacuum vessel 2.
2 as shown in FIG. 2, and is supported by a plurality of annular support plates 3 installed between the vacuum vessel 2 and the toroidal magnetic field coil 1.

This annular support plate 3 is a support (6A) fixedly attached to the upper frame 4 as shown in FIG.

7A and a support (support) 6B fixedly attached to the lower pedestal 5.

7B, and are individually supported by connecting bolts or the like.

The vacuum vessel 2 is vertically equipped with a port 9 for performing plasma measurement and the like, passing through the upper and lower frames 4 and 5 from the outside.

This port 9 is arranged at a position perpendicular to the annular support plate 3.

For this reason, the annular support plate 3 connects the bolt 1 through the connecting members 3A and 3B surrounding the port 9 at the port 1-9 portion.
0, thereby creating a continuous ring-shaped structure (see Figure 4).

Then, when the entire device is operated and a large current is passed through the poloidal magnetic field coil 13, the torus is displaced in the radial direction due to thermal expansion, etc., and thereby the poloidal magnetic field coil 1
A force in the radial direction of the torus is applied to the annular support plate 3 fixing the torus, but this force is intended to be withstood by the rigidity of the annular support plate 3.

On the other hand, according to this prior art, the annular support plate 3 that interposes and supports the poloidal magnetic field coil 13 has many connection points, so the rigidity of the annular support plate 3 becomes extremely weak.

Therefore, in order to compensate for this rigidity, the upper and lower frames 4 and 5 supporting the annular support plate 3 and the center column 11. The disadvantage is that the outer support column 12 has to be increased in size, making the overall device very large.

Furthermore, since the supports 6A, 7A, 6B, and 7B that fixedly support the annular support plate 3 are fixedly attached to the upper mount 4 and the lower mount 5, respectively, if a relative displacement occurs between the upper and lower mounts 4 and 5, , there is a risk that the annular support plate 3 may be damaged, and this has a serious drawback in terms of safety.

The present invention improves the drawbacks of the above-mentioned prior art, and has the rigidity to reliably hold the poloidal magnetic field coil in a predetermined position without restricting the displacement of the poloidal magnetic field coil in the radial direction of the torus due to thermal expansion or the like. The purpose is to provide a highly safe nuclear fusion device.

The present invention is equipped with an annular support plate located on the inner diameter side of a toroidal magnetic field coil, and is equipped with support legs that support the annular support plate on the outside and inside of the torus radius, and one of the support legs is connected to an apparatus mount and a support leg. The above-mentioned object is achieved by rotatably connecting the support legs to the two plates, and equipping the other support leg so as to be slidable with respect to the device pedestal.

An embodiment of the present invention will be described below with reference to FIG.

Here, the same reference numerals are used for the same components as in the prior art described above.

In the figure, the nuclear fusion device includes a toroidal vacuum container 2 that confines plasma 8 inside, and a plurality of toroids installed around the vacuum container 2 to generate the plasma 8. In order to apply Joule heat to the magnetic field coil 1 and the plasma 8, the vacuum container 2 is placed in the space between the vacuum container 2 and the toroidal magnetic field coil 1 so as to surround it in the circumferential direction of the torus so as to form a substantially concentric circle with the vacuum container 2. A plurality of poloidal magnetic field coils 13 installed in
, disk-shaped upper and lower mounts 4 and 5 that support and fix the vacuum container 2, toroidal magnetic field coil 1 and poloidal magnetic field coil 13, a central support 11 that supports the upper and lower mounts 4 and 5, and a plurality of and an outer support column 12.

The poloidal magnetic field coil 13 is fixedly supported by a plurality of annular support plates 31 at approximately equal intervals, similar to the prior art described above.

Each annular support plate 31 is connected to the toroidal magnetic field coil 1.
The toroidal magnetic field coil 1 is located on the inner diameter side of the toroidal magnetic field coil 1 and within the width of the toroidal magnetic field coil 1 (see FIG. 6).

Thereby, the annular support plate 31 becomes an independent support plate having a seamless and highly rigid shape.

Each of the annular support plates 31 formed in this way is supported by two sets of support legs 14.17, which are divided into outer and inner sides in the radial direction of the torus, at the lower part in FIG.

The poloidal magnetic field coil 13 and the annular support plate 31 are supported on the lower pedestal 5 via the support legs 14,17.

The inner and outer support legs 14 of the support legs 14.17 are the seventh
As shown in the figure, the toroidal magnetic field coil 1 is straddled in the shape of a horse's legs, and its upper end is connected and fixed to an annular support plate 31, and a sliding plate 15 is fixed to its lower end. is configured to be slidable on the lower pedestal 5.

On the other hand, the inner support leg 17 has a structure that straddles the toroidal magnetic field coil 1, as shown in FIG. The lower end portion is also pivotally supported by the lower pedestal 5 via a pin 16B.

The support leg 17 has a rotatable structure due to these pin connections.

In order to measure the plasma 8 in the vacuum container 2, a fifth
As shown in the figure, the port 9 extends vertically from the outside through each of the upper and lower frames 4 and 5, between each of the annular support plates 31 and through the gap between the poloidal magnetic field coils 13, It is directly joined to the vacuum container 2.

Other structures are the same as those of the prior art described above.

Next, the overall operation of the above embodiment will be explained.

The entire device is now in operation, and the poloidal magnetic field coil 13
When a large current flows through the poloidal magnetic field coil 13, the poloidal magnetic field coil 13 tends to be displaced in the radial direction of the torus due to thermal expansion due to Joule heat while being subjected to vertical electromagnetic force.

This displacement force is transmitted to the entirety of each annular support plate 31 supporting the poloidal magnetic field coil 13, and the resultant force F acts on the horizontal center of the support plate 31.

This allows the two sets of support legs 14.17 to
If the structure is fixed to , a huge moment) MA-FXH (where H is the distance from the horizontal center of the annular support plate 31 to the lower frame 5) will act on the support legs 14 and 17.

However, since the outer support leg 14 portion is configured to be slidable on the lower pedestal 5, it inevitably slides due to the resultant force F, and the restraining force is only the frictional force f of the sliding portion.

Since a force that balances this frictional drag force f acts on the horizontal center of the annular support plate 31, a moment MB=fXH is generated that attempts to rotate the annular support plate 31 with the sliding portion of the outer support leg 14 as a reference point.

On the other hand, the inner support leg 17 has an annular support plate 31. Since it is rotatably connected to the lower pedestal by the pins 16A and 16B, the annular support plate 31 attempts to rotate about the bottom of the support leg 14, but is supported and restrained by the rigidity of the support leg 17 in the tensile direction. .

Due to this action, even if the poloidal magnetic field coil 13 is displaced in the torus radial direction due to thermal expansion or the like, it can be firmly supported without being restrained, and the two sets of support legs 14 and 17 are attached to the lower pedestal 5. Since the annular support plate 31 is installed only on the annular support plate 31, the relative displacement of the upper and lower frames 4 and 5 does not affect the annular support plate 31.

Further, the annular support plate 31 is arranged so that the toroidal magnetic field coil 1
Because it is arranged within the width of

As described above, according to the present invention, a highly safe nuclear fusion device is provided which has a support device that can release the thermal expansion of a poloidal magnetic field coil through which a large current flows without restricting it, and can hold it correctly in a predetermined position. can be provided.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view showing a conventional nuclear fusion device, Figure 2 is a cross-sectional view taken along the line ■■-■■ in Figure 1, and Figure 3 is a cross-sectional view taken along the line III-III in Figure 1. FIG. 4 is an enlarged partial sectional view showing the orthogonal part between the support plate and the port in FIG. 1; FIG. 5 is a partial vertical sectional view showing an embodiment of the fusion device of the present invention; Figure 6 is a cross-sectional view taken along line VI-VI in Figure 5, and Figure 7 is a cross-sectional view taken along line VI-VI in Figure 5.
An enlarged partial sectional view taken along the l-Vll line, FIG.
It is an enlarged partial sectional view along the vm-Vllll line of a figure. 1... Toroidal magnetic field coil, 2...
Vacuum container, 4... Upper mount, 5... Lower mount, 13... Poloidal magnetic field coil, 14, 1
7... Support leg, 31... Annular support plate.

Claims (1)

[Claims] 1. A vacuum container, a plurality of toroidal magnetic field coils surrounding the vacuum container and arranged at predetermined intervals in the circumferential direction of the torus, and installed concentrically with the vacuum container between the toroidal magnetic field coil and the vacuum container. a plurality of annular support plates installed at predetermined positions between the vacuum container and the poloidal magnetic field coils to support the poloidal magnetic field coils; and support legs for the annular support plates. In the nuclear fusion device, the annular support plate is located on the inner diameter side of the toroidal magnetic field coil, and the annular support plate is provided with 1 to -
It is supported on the pedestal via support legs from the outside and inside of the lath radius, one of the support legs is rotatably connected to the pedestal and the annular support plate, and the other is equipped to be slidable with respect to the pedestal. A nuclear fusion device characterized by: