JPS62204187A - 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 more particularly to a nuclear fusion device having a large superconducting magnet system.

[Prior art]

Sufficient seismic analysis has been performed on torus-type fusion devices with normal conducting magnet systems, and a design of a system with a sound seismic structure has been completed. However, for nuclear fusion devices that have large superconducting magnet systems, there are few examples of detailed seismic analysis of superconducting magnet systems, and when constructing a large superconducting magnet system in an earthquake-prone country like Japan, the There was great anxiety.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a torus-type nuclear fusion device with high seismic performance by providing an effective reinforcing member to a superconducting toroidal magnetic field coil system. It is in.

[Summary of the invention]

The present invention fixes an earthquake-resistant reinforcing member above a large superconducting toroidal magnetic field coil of a torus-type nuclear fusion device, and supports and fixes the open end of this reinforcing member in a normal temperature part outside an insulated vacuum container housing the magnetic field coil. The desired purpose is achieved by directly coupling the fixing position to the part so that the fixing position thereof can be adjusted.

[Embodiments of the invention]

An embodiment of a nuclear fusion device according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG. The superconducting toroidal magnetic field coil 1 and the center column 2 are connected to the heat insulating support legs 3 and via the thermal anchor 4 cooled with liquid nitrogen or the like.
It is supported on the floor of an insulated vacuum container 5 that is at room temperature. The heat insulating support leg 3 has the minimum breakage required to support the weight of the magnetic field coil system in order to reduce the amount of heat intruding into the super-conducting toroidal coil 1 and the center column 2 in extremely low flooding conditions. It is the area. Further, as the material of the heat insulating support legs 3, glass fiber reinforced plastic or the like having low thermal conductivity is used. A plasma vacuum vessel 6 is disposed inside the superconducting toroidal magnetic field coil 1 .

Furthermore, seismic reinforcement members 8 are arranged radially above the coil 1 when viewed from directly above. A reinforcing flange 9 is fixed to the end of the seismic reinforcing member 8 on the room temperature side, and the reinforcing flange 9 is airtightly connected to the heat insulating vacuum vessel 5 via a bellows 10. The bellows 10 absorbs the displacement of the reinforcing 7 flange 9 due to cooling of the coil system, thermal contraction during temperature rise, and thermal expansion. A reinforcing fixing device 13 having a fixing plate 12 formed with a notch 11 that fits into the reinforcing flange 9 is mounted on the upper part of the reinforcing flange 9, and is fixed to the outer wall of the heat insulating vacuum container 5. There is.

This reinforcing fixing device 13 includes a lever 15 that is rotatably supported by a bearing 14, and the fixing plate 12 that is slidable and fixed in a predetermined position is fitted onto the lever 15. Furthermore, the seismic reinforcement member 8 includes:
In order to reduce the amount of heat entering the coil system, a thermal anchor 16 cooled with liquid nitrogen or the like and a radiation shield 17 are provided.

The operation of one embodiment of the present invention configured as described above will be described below. When the temperature of the coil system becomes steady, the reinforcing fixing device 13 whose length is adjusted so that the reinforcing 7 flange 9 fits into the notch 11 of the fixing plate 12 moves from the dotted line position in FIG. 2 to the solid line. The fixing plate 12 is fitted and fixed to the reinforcing 7 flange 9, and the seismic reinforcing member 8 is therefore completely fixed and the reinforcement is completed. When the temperature of the coil system is changing, that is, when the temperature is cooling or rising, the reinforcing fixing device 13 is in the position indicated by the dotted line, and the seismic reinforcing member 8 is untied at the normal temperature end. Toroidal magnetic field coil 1
can move freely according to thermal displacement. In other words, thermal contraction and thermal expansion of the coil system can be tolerated.

It is a great advantage of this embodiment that the operation of binding and releasing the seismic reinforcing member (by the reinforcing fixing device 13) can be performed outside the heat-insulating vacuum container 5, that is, on the atmospheric side.

As described above, according to the embodiment of the present invention, the toroidal magnetic field coil, which is a heavy object, is supported by legs with relatively low rigidity to form an inverted pendulum, and the drawback of being weak against earthquakes is improved, and the seismic reinforcement member 8 Since the material itself is glass fiber reinforced plastic, carbon fiber reinforced plastic, etc., and it is cooled by the thermal anchor 17, the amount of heat entering the coil system hardly increases, and the natural frequency of the toroidal magnetic field coil 1 increases. can be increased by more than 10 times, and the amplitude of the system caused by an earthquake can be reduced to about 1/30.

〔Effect of the invention〕

As described above, according to the present invention, an earthquake-resistant reinforcing member is provided above the large superconducting toroidal magnetic field coil of the torus-type nuclear fusion device, which is directly connected to the room-temperature part, thereby improving the earthquake resistance of the large-sized superelectric fusion device. Because it can be done, the effect is on the dog.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a toroidal fusion device having a superconducting toroidal magnetic field coil, and FIG. 2 is a cross-sectional view showing the vicinity of the upper part of the toroidal magnetic field coil of an embodiment of the nuclear fusion device according to the present invention.

Claims (1)

[Claims] 1. A toroidal plasma vacuum container that stores plasma therein, a plurality of superconducting toroidal magnetic field coils that surround the plasma and are arranged at predetermined intervals in the circumferential direction of the torus, and cover this. In a nuclear fusion device equipped with an insulating vacuum vessel, a reinforcing member is provided, one end of which is fixed above the superconducting toroidal magnetic field coil, and the other end of which protrudes into a room temperature area outside of the insulating vacuum vessel, and the reinforcing member is The projecting end and the outer wall of the heat insulating vacuum container are airtightly connected by a retractable sealing member, and an adjustable fixing device is provided that can fix the projecting end of the reinforcing member in any position. Nuclear fusion device. 2. The nuclear fusion device according to claim 1, wherein the intermediate portion of the reinforcing member is cooled with an intermediate temperature refrigerant such as liquid nitrogen. 3. The nuclear fusion device according to claim 1, wherein the material of the reinforcing member is glass fiber reinforced plastic, carbon fiber reinforced plastic, or a combination of both.