JPS642230B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric winding in a vacuum vessel of a nuclear fusion device, and in particular to an electric winding in a vacuum vessel of a nuclear fusion device suitable for use in a diverter coil etc. installed in a vacuum vessel. Regarding.

Figures 1 and 2 schematically show the nuclear fusion device.

As shown in the figure, a plurality of toroidal magnetic field coils 14 are installed around the donut-shaped vacuum container 12 and at predetermined intervals in the torus direction, and these are supported by a base 16. ing. Furthermore, around the outer periphery of the vacuum container 12,
A poloidal magnetic field coil 18 is arranged concentrically with the vacuum vessel 12. Further, a vacuum evacuation device 20 is attached to the vacuum container 12. On the other hand, in the vacuum vessel 12, a neutral particle injection device 22 for additionally heating the internal plasma 34 is installed at a neutral particle injection port 24.
are connected via. Furthermore, an alternator 2 surrounds the vacuum vessel 12 and the toroidal magnetic field coil 14.
6 is placed.

By the way, the above-mentioned vacuum container 12 is configured such that the bellows portion 28 and the thick wall portion 30 are alternately combined in the torus direction. And the vacuum container 12
Inside, a poloidal magnetic field coil 32 such as a diverter coil is installed concentrically with the vacuum vessel 12.

The vacuum container 12 is a device that creates a vacuum inside and generates plasma 34 inside.
8 is used for the purpose of obtaining a higher one-round resistance than the plasma 34 and absorbing thermal deformation of the vacuum vessel 12.

For this reason, the vacuum container 12 has poor rigidity as a unit, and each thick wall portion 30 separated by the bellows portion 28
Since large eddy currents flow during plasma startup and extinction, a large electromagnetic force is applied due to the interaction with the toroidal magnetic field and poloidal magnetic field. Therefore, the relative displacement between each thick wall portion 30 due to the action of the electromagnetic force and the mechanical action during installation and during an earthquake becomes a considerable amount.

The purpose of the poloidal magnetic field coil 32 disposed inside the vacuum vessel 12 is to remove impurities that enter from outside the plasma, and this coil requires a magnetomotive force comparable to the plasma current. Therefore, the electromagnetic force caused by the plasma current and the poloidal magnetic field coil becomes strong. This electromagnetic force can be divided into a horizontal component and a vertical component,
The horizontal electromagnetic force is supported by the hoop stress of the conductor of the electric winding itself, and the vertical electromagnetic force is supported by the vacuum vessel 12. Therefore, a hoop stress due to the horizontal electromagnetic force and a bending stress due to the vertical electromagnetic force are generated in the conductor of the electric winding. Note that this bending stress is inversely proportional to the bending rigidity of the coil and proportional to the square of the support interval by the vacuum vessel 12.

Furthermore, in nuclear fusion devices, neutral particles are injected as a means of additionally heating the plasma. For this purpose, a neutral particle injection device 22 is connected to the vacuum vessel 12 via a neutral particle injection port 24 . For this reason, the thick wall part 3 of the vacuum container
Since the poloidal magnetic field coil 32 passing through 0 is supported avoiding the neutral particle injection port 24, the support interval is large.

As mentioned above, the poloidal magnetic field coil 32 inside the vacuum vessel 12 is required to withstand a large electromagnetic force and at the same time absorb the displacement of the bellows portion 28 of the vacuum vessel 12, which causes the following problems. arise.

That is, when the vertical bending stiffness of the poloidal magnetic field coil 32 is increased, the thick portion 30 of the vacuum vessel 12
Although it can withstand vertical electromagnetic force generated within
The forced displacement of the bellows portion 28 of the vacuum container 12 generates large stress. Therefore, in order to absorb the forced displacement of the bellows portion 28 of the vacuum vessel 12, if the vertical bending stiffness of the poloidal magnetic field coil 32 is reduced, the bending stress caused by the electromagnetic force in the thick walled portion 30 causes the electromagnetic force to be applied to the coil. becomes unbearable.

The present invention has been made in view of the above problems.
The purpose is to provide an electric winding in a vacuum vessel of a nuclear fusion device that can withstand bending stress due to strong electromagnetic force and absorb forced displacement of the bellows portion of the vacuum vessel.

The present invention reduces the bending stiffness of the electrical winding inside the vacuum container in the bellows part of the vacuum container, and also reduces the support interval of the electrical winding, and in the thick part of the vacuum container, the bending stiffness of the electrical winding inside the vacuum container is reduced. This is achieved by increasing the rigidity and supporting distance to achieve the desired purpose.

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

FIGS. 3 to 5 show an electric winding in a vacuum container which is an embodiment of the present invention. However, the first
Parts corresponding to those in the figures and FIG. 2 are indicated using the same reference numerals.

In FIGS. 3 and 4, a coil protector 38 is supported and fixed inside a vacuum container constituted by a bellows portion 28 and a thick wall portion 30 by a support 36. As shown in FIGS. The coil protector 38 is composed of a protector bellows 40 and a thick protector portion 42. Further, the spacing between each support body 36 is determined by the bellows portion 28.
It is small in the thick part 30, and large in the thick part 30.
Note that the vacuum vessel is provided with a port hole 44 for neutral particle injection. A coil integrated taping 48 supported by a coil support 46 is installed inside the coil protector 38, and a heat insulating material 50 is packed between the coil integrated taping 48 and the coil protector 38. There is.

A plurality of coils (electrical windings) 54 whose peripheries are covered with insulation 52 are arranged in this coil integrated taping 48, and a padding 56 is inserted between the turns of each coil 54. Further, a cooling path 58 is provided in the center of the coil 54. Furthermore, the fifth
In the figure, a plurality of coils 54 covered with insulation 52 are arranged, but since the coil-integrated taping 48 and padding 56 are removed, there are gaps between the turns of each coil 54.

Since this embodiment is configured as described above,
As shown in FIG. 4, in the thick part 30 where the support gap (pitch) of the support body 36 is large, the coil-integrated taping 48 provides strong rigidity against bending stress between the support pitches caused by electromagnetic force. It has the effect of having Further, in the portion of the bellows portion 28, the support body 36
At the same time, as shown in Fig. 5, each turn of the coil is made independent and a gap is provided between the turns, so the bending stiffness is small and forced changes in the bellows part 28 can be easily absorbed. effective. In this case, although the bending rigidity is reduced with respect to the vertical electromagnetic force, the support interval of the supports 36 is reduced accordingly, so that the structure can withstand the bending stress caused by the electromagnetic force.

FIG. 6 shows an electric winding in a vacuum container according to another embodiment of the present invention. However, parts corresponding to FIGS. 3 to 5 are indicated using the same reference numerals.

As shown in the figure, in this embodiment, the reinforcing case 60
A coil 54 covered with an insulation 52 is disposed inside the coil 54, and a padding 56 is inserted between the turns of each coil 54. This embodiment has the same structure as the previous embodiment except that a reinforcing case 60 is provided to increase bending rigidity, and the structure of the coil passing through the bellows portion is the same as that shown in FIG. This embodiment also has the same effects as the previous embodiment.

According to the electric winding in the vacuum vessel of the nuclear fusion device of the present invention described above, the electric winding passing through the bellows portion of the vacuum vessel has a lower bending rigidity than the electric winding passing through the thick portion, and the electric winding Since the spacing in the torus direction of the support that fixes the wire to the vacuum container is made smaller in the bellows part than in the thick part, it can withstand the bending stress caused by strong electromagnetic force, and the bellows part can withstand the bending stress caused by strong electromagnetic force. Since it can absorb displacement, it is effective for electrical windings in this type of vacuum container.

[Brief explanation of drawings]

Fig. 1 is a plan cross-sectional view showing an outline of a conventional nuclear fusion device, Fig. 2 is a - cross-sectional view of Fig. 1, and Fig. 3 is a developed cross-section of an electric winding in a vacuum vessel, which is an embodiment of the present invention. Figure 4 is a detailed sectional view of the electric winding, Figure 5 is a detailed cross-sectional view of the electric winding.
6 and 6 are detailed cross-sectional views of electric windings in a vacuum container according to another embodiment of the present invention. 12... Vacuum vessel, 14... Toroidal coil, 18, 32... Poloidal coil, 28...
Bellows part, 30... Thick wall part, 36... Support body,
48... Coil integrated taping, 52... Insulation, 54... Coil, 60... Reinforcement case.

Claims (1)

[Scope of Claims] 1. A bellows portion and a thick wall portion are alternately combined in a torus direction to form a substantially donut shape, and are placed inside a vacuum container that stores plasma therein, and are supported by the vacuum container. , in an electric winding in a vacuum vessel of a nuclear fusion device installed concentrically with a vacuum vessel, the electric winding passing through a bellows portion of the vacuum vessel has a lower bending rigidity than the electric winding passing through a thick portion; An electric winding in a vacuum vessel of a nuclear fusion device, characterized in that the spacing in the torus direction of the support for fixing the electric winding to the vacuum vessel is smaller in the bellows portion than in the thick portion. 2. In claim 1, the electrical winding passing through the bellows portion of the vacuum container is made independent one turn at a time, with a gap between each turn, and the electrical winding passing through the thick portion of the vacuum container. An electric winding in a vacuum vessel of a nuclear fusion device characterized by having an integrated structure. 3. The electric winding in a vacuum vessel of a nuclear fusion device according to claim 1, wherein the electric winding passing through a thick portion of the vacuum vessel excluding a bellows portion is housed in a reinforcing case.