JPS6111680Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a torus-type nuclear fusion device, and particularly relates to a torus-type nuclear fusion device equipped with a superconducting toroidal magnetic field coil.

In conventional nuclear fusion devices with superconducting toroidal magnetic field coils, each of the plurality of divided coils is provided with an insulated vacuum chamber, and the electromagnetic force is supported from the outside by a supporting member at room temperature. However, this method requires the members that support the coil in the insulated vacuum chamber to have contradictory properties: rigidity to transmit a strong electromagnetic force and insulation to maintain the coil at the temperature of liquid helium (4.2〓). For this reason, increasing the rigidity requires using a material with good thermal conductivity and increasing the heat transfer area, which reduces the insulation performance, making it difficult to cool the coil, and eventually destroying the superconductivity of the coil conductor. This will cause a phenomenon. To prevent this, a reinforced synthetic resin or the like with low thermal conductivity is used to reduce the heat transfer area, but this has the disadvantage of insufficient rigidity, leading to mechanical destruction of the coil.

The purpose of the present invention is to reduce the amount of heat entering the coil by cooling the support member of the superconducting toroidal magnetic field coil to a low temperature, and to provide a nuclear fusion device equipped with a support structure having sufficient rigidity.

The present invention will be explained in detail below using the drawings. FIG. 1 is a sectional view of a tokamak-type nuclear fusion device in which the present invention is implemented. The dot-dash line at the left end of the figure is the rotation center of the torus, and the left half is omitted in the figure. Toroidal magnetic field coil 1 is a superconducting coil placed in a non-magnetic container together with liquid helium. The toroidal magnetic field coil 1 is supported by upper and lower cold bases 3, 4 and cold struts 5. In this example, when the central toroidal magnetic field is 8 Tesla, a central force of about 10,000 tons and a vertical rotational moment of 200 tons/meter are applied to the toroidal magnetic field coil, but the former causes the torus center side of the toroidal magnetic field coil itself to be wedged. The latter is supported by low-temperature bases (upper and lower) by low-temperature struts and truss columns (not shown) (members that connect struts diagonally to form a truss structure).

Since the low-temperature bases 3 and 4 and the low-temperature columns 5 and truss columns are all cooled with 4.2㎓ liquid helium, no heat is conducted from there to the toroidal magnetic field coil. Furthermore, the part that is connected to the high temperature part is the base support 7, but as mentioned above, the electromagnetic force of the toroidal magnetic field coil is connected to the low temperature base 3, 4,
Since the base support 7 is supported by the low-temperature support 5, the base support 7 only needs to support the weight of the low-temperature section. Therefore, in this embodiment, a tube made of reinforced synthetic resin with low thermal conductivity is used to obtain a heat insulating effect. In this embodiment, in addition to the above, there are other parts that are kept at room temperature, such as the vacuum container 2, the current transformer coil 6, and the vertical magnetic field coil 1.
Since these are all attached to the high temperature bases 8 and 9, they are insulated from the low temperature members by the base struts 7.

As described above, according to the embodiment of the present invention, the electromagnetic force of the toroidal magnetic field coil is supported by the low-temperature support material, and the amount of heat intrusion from the high-temperature side can be reduced.

Furthermore, if the entire apparatus as shown in FIG. 1 is placed in a vacuum chamber, it is possible to reduce the amount of heat entering into the low-temperature part due to gas molecule conduction.

As described above, according to the present invention, it is possible to obtain a nuclear fusion device that reduces the amount of heat entering the superconducting coil and has a highly rigid support structure.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of an embodiment of the present invention. 1... Toroidal magnetic field coil, 2... Vacuum vessel, 3... Low temperature base (top), 4... Low temperature base (bottom), 5... Low temperature support, 6... Current transformer coil, 7
...Base support, 8...High temperature base (top), 9...
...High temperature base (bottom), 10... Support column, 11... Vertical magnetic field coil.

Claims (1)

[Scope of utility model registration request] In a torus-type nuclear fusion device having a superconducting toroidal magnetic field coil, a vacuum vessel/air-core current transformer coil, etc., the superconducting toroidal magnetic field coil is supported by upper and lower low-temperature bases cooled with liquid helium and low-temperature struts connecting these. , and the vacuum container and the normally conducting coil are supported by a high-temperature base, and a base support made of synthetic resin with low thermal conductivity is interposed between the upper and lower low-temperature bases and the high-temperature base. Torus type nuclear fusion device.