JPS5930236B2 - Torus type fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torus-type nuclear fusion device, and particularly to a torus-type nuclear fusion device with an improved support structure for its toroidal coil.

The main structure of a torus-type fusion device is an annular (torus-shaped) vacuum container that stores plasma inside, and a plurality of toroidal coils that surround the vacuum container and are arranged radially at predetermined intervals in the direction of the torus. Something,
Plasma is confined inside the vacuum container by the electromagnetic field of the toroidal coil.

In recent years, nuclear fusion devices have become increasingly larger in order to lengthen the plasma confinement time, and the electromagnetic force has increased from several tens of tons to several thousand tons. It became necessary to endure.

The electromagnetic force in conventional toroidal fusion devices was relatively small, so the toroidal coil itself supported the electromagnetic force,
The support device supporting the toroidal coils was only required to serve as a stop for arranging the toroidal coils.

Furthermore, since the device was small, there was no need to consider thermal expansion due to temperature rise of the toroidal coil.

Therefore, the supporting device only needs to be a structure that can hold the toroidal coil.

However, as the fusion device becomes larger, the electromagnetic force also becomes stronger, which must be supported by a support device.

However, as the device becomes larger, the current density in the coil conductor is increased compared to conventional devices, which increases the temperature of the toroidal coil.

As a result, the toroidal coil undergoes deformation due to thermal expansion, but when supported by a support device, internal stress in the coil conductor increases.

Copper is generally used for the coil conductor, but even if high strength copper is used, deformation due to thermal expansion cannot be prevented.

The present invention has been made in view of the above points, and its purpose is to relieve the internal stress by releasing the amount of thermal deformation caused by the temperature rise of the toroidal coil, and to make the toroidal coil withstand strong electromagnetic force. The object of the present invention is to provide a torus-type fusion device that can support the following.

The present invention interlocks with a torus-shaped vacuum container that stores plasma inside and arranges it radially outside the toroidal coil, and the toroidal outer circumferential side of a plurality of toroidal coils and the outer circumferential side of this toroidal coil are wrapped and supported by a base. The intended purpose is achieved by interposing a stress relaxation member between the toroidal coil and the support member that relieves internal stress caused by thermal expansion of the toroidal coil.

The present invention will be described below based on embodiments shown in the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In the figure, reference numeral 1 denotes an annular vacuum container, which houses plasma 2 inside.

Reference numeral 3 denotes a toroidal coil device surrounding the vacuum vessel 2 and having a plurality of toroidal coils arranged at predetermined intervals in the circumferential direction of the torus, which is wrapped around a disk-shaped toroidal coil 4 and supported by upper and lower bases 6.7. It is composed of a support device 5.

This toroidal coil device 3 generates a magnetic field for confining and holding the plasma 2 within the vacuum vessel 1.

Reference numeral 8 denotes a stress relaxation member interposed between the torus outer peripheral side 9a of the toroidal coil 4 and the support device 5 in this embodiment.

This stress relaxation member 8 is preferably made of a synthetic resin material having a small Young's modulus.

Even if the electromagnetic force has a small Young's modulus, the force can be sufficiently transmitted to the support device 5 because of the all-around contact.

The best choice for the synthetic resin used as the stress relaxation member 8 is a thermoplastic plastic that softens when heat is applied and returns as the heat is removed.

Therefore, the toroidal coil 4 is in contact with the support device 5 on the outer circumferential side 9a of the torus outside the center and on the upper and lower sides via the stress relaxation member 8, and on the inside is directly in contact with the support device 5 and held on the inner circumferential side 9a of the torus. There is.

In the torus-type fusion device configured in this way,
By energizing the toroidal coil 4, electromagnetic forces such as a center-direction force 10 acting toward the center of the torus and a hoop force 11 acting in the circumferential direction of the toroidal coil 4 are generated.

The center direction force 10 is supported by the torus inner peripheral side 9b of the support device 5, and the hoop force 11 is shared and received by the support device 5 via the toroidal coil 4 itself and the stress relaxation member 8.

In addition, thermal expansion due to the temperature rise of the toroidal coil 4 escapes in the direction of arrow 12 due to the presence of the stress relaxation member 8, and since the stress relaxation member 8 softens in proportion to the temperature rise, the Young's modulus decreases, and the toroidal coil 4 heats up. Reduce swelling.

Although the stress relaxation member 8 has a lower Young's modulus, it transmits force to the support device 5 due to compressive deformation.

Therefore, it is possible to sufficiently support strong electromagnetic force, and it is also possible to alleviate internal stress applied to the toroidal coil due to thermal expansion.

Further, by obtaining a high current density, a torus-type nuclear fusion device that can perform a nuclear fusion reaction at a high temperature for a long time can be obtained.

Although it has been described that thermoplastic synthetic resin is used as an example of the stress relaxation member 8, other examples include tetrafluoroplastic synthetic resin, and in this case, the tetrafluoroplastic synthetic resin and the support device 5, or It is effective to fill the gap between the tetrahydrogen synthetic resin and the toroidal coil 4 with Tetron nonwoven fabric impregnated with phenol or glass nonwoven fabric.

According to the torus-type nuclear fusion device of the present invention explained above,
The outer circumferential side of the torus of a plurality of toroidal coils arranged radially outside the toroidal coil interlinked with a toroidal vacuum vessel that stores plasma inside, and the supporting member that wraps the outer circumferential side of the toroidal coil and is supported by a base. Since a stress relaxation member is interposed between the toroidal coil and the toroidal coil to relieve internal stress caused by thermal expansion, even if the device becomes large and strong electromagnetic force is generated, it cannot be supported by the support device. In addition, the thermal deformation caused by the temperature rise of the toroidal coil can be absorbed by the stress relaxation member, which reduces internal stress and is very effective when used in this type of nuclear fusion device.

[Brief explanation of the drawing]

FIG. 1 is a horizontal cross-sectional view of an embodiment of the torus-type nuclear fusion device of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1... Vacuum container, 2... Plasma, 3
...Toroidal coil device, 4 ... Toroidal coil, 5 ... Support device, 6 ...
...Top base, 7...Bottom base, 8...
・Stress relaxation member, 9a...Torus outer circumferential side, 9
b...Torus inner circumferential side, 10...Center direction force, 11...Hoop force.

Claims (1)

[Scope of Claims] 1. A toroidal vacuum container that stores plasma therein, a plurality of toroidal coils interlinked with the vacuum container and arranged radially outside the vacuum container, and an outer peripheral side of each of the toroidal coils. In a torus-type nuclear fusion device having a support device that surrounds the toroidal coil and is supported by a base, a stress relaxation member is provided between the outer peripheral side of the torus of the toroidal coil and the support device to relieve internal stress caused by thermal expansion of the toroidal coil. A torus-type nuclear fusion device characterized by intervening. 2. The torus-type nuclear fusion device according to claim 1, wherein a thermoplastic synthetic resin is used as the stress relaxation member. 3. The torus-type nuclear fusion device according to claim 1, wherein a tetrahydrofurous synthetic resin is used as the stress relaxation member. −