JPS597955B2 - Torus-shaped fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torus-shaped nuclear fusion device, and particularly to a torus-shaped nuclear fusion device suitable for applications to which a huge electromagnetic force is applied.

Generally, a torus-shaped nuclear fusion device has an annular vacuum vessel in the center, a large number of toroidal coils arranged radially around the outer periphery of this vacuum vessel, and vertical magnetic resonance coils inside and outside of the troigle coils. It will be set up.

Plasma confinement in such a torus-shaped fusion device is achieved by forming plasma in a vacuum vessel using a magnetic field from a toroidal coil, heating this plasma by Joules using a current transformer, and stabilizing it using a vertical magnetic field coil. I was trying to let him do it.

By the way, in recent years, torus-shaped fusion devices are increasingly becoming dog-shaped, and the electromagnetic force generated is several thousand tons in the direction of the center of the torus, and several hundred tons in the circumferential direction of the torus. A structure that can withstand huge electromagnetic forces has become necessary.

The structure of a conventional torus-shaped fusion device will be explained with reference to FIG.

In the figure, a lower base 1 is supported on a pedestal 3 erected on a floor 2, and an upper base 5 is connected to the lower base 1 via an outer frame 4 having a U-shaped cross section. The toroidal coil support 6 is clamped from above and below,
Stably supported.

Inside this toroidal coil support 6 is a toroidal coil 7 held by the toroidal coil support 6.
A large number of toroidal coils 7 are arranged radially, and an annular vacuum vessel 8 is arranged at the center of these toroidal coils 7.

Plasma 9 is formed inside this vacuum container 8 by the toroidal magnetic field and is kept in a sealed state.

Furthermore, vertical magnetic field coils 12 and 13 are arranged vertically symmetrically on the outside of the torus by supports 10 and 11 protruding from the lower base 1 and the upper base 5, and these vertical magnetic field coils 12 and 13 The plasma 9 in the vacuum container 8 is stabilized.

Also, on the center side of the torus, the lower base 1,
Unwinding coils 16.17 are vertically symmetrically arranged by supports 14.15 protruding from the upper base 5, and the unwinding coils 16.17 prevent induced voltage from the current transformer. It has become.

At the center of the torus is an iron core 18 and a current transformer coil 19.
is arranged to heat the plasma 9 in the vacuum vessel 8 by Joule.

Furthermore, shield plates 20 and 21 are vertically symmetrically arranged above and below the upper and lower bases 5 and 1 to prevent a scattered magnetic field from being transmitted to the plasma 9.

In addition, in FIG. 1, the symbol FR is an electromagnetic force acting in the direction of the center of the torus.

However, with such a conventional configuration, the lower base 1
, and the distance between the upper base 5 and the center of the toroidal coil 7 becomes large, so that excessive bending stress acts on the toroidal coil 7.

For this reason, the lower base 1 and the upper base 5 are provided with protrusions 1a and 5a inside, respectively, so as to receive the electromagnetic force F'R acting in the direction of the torus center. However, if the electromagnetic force FR increases, it becomes unbearable.

Further, in order to support the electromagnetic force FR in the direction of the center of the torus, it was considered to provide a circular block (not shown) at the center of the torus, but since it is necessary to provide the iron core 18, mutual interference occurs. , it is impossible to provide a block.

On the other hand, FIG. 2 shows the distribution of electromagnetic force in the circumferential direction of the torus generated from one toroidal coil I, and the average value of these electromagnetic forces is indicated by FL.

In addition, in the figure, 6a indicates the upper part of the toroidal coil support 6, and 6b indicates the lower part of the toroidal coil support 6.

As shown in the figure, according to the above-described configuration, the toroidal coil 7 is held by the toroidal coil support 6 held between the lower base 1 and the upper base 5, so that the electromagnetic force acting in the circumferential direction of the torus is The distribution will be as shown by the arrow, and the distance /-1 between the support position of the lower part 6b of the toroidal coil support 6 and the load point is large;
The bending stress acting on the toroidal coil support 6 and the toroidal coil 7 becomes large.

Thus, the lower base 1 and the upper base 5 are connected via the outer frame 4, but this outer frame 4 only reduces the movement of the entire torus in the rotational direction. However, the bending stress due to the electromagnetic force in the toroidal circumferential direction acting on the toroidal coil 7 does not decrease.

The present invention has been made in view of the above points, and its purpose is to support the force acting toward the center of the torus due to the action of a huge electromagnetic force, and to reduce bending stress in the circumferential direction of the torus. The purpose of the present invention is to provide a torus-shaped fusion device that can perform

The present invention includes a toroidal coil support that encloses a substantially annular vacuum container that stores plasma inside, and that covers and holds the outer periphery of each of a plurality of toroidal coils arranged at predetermined intervals in the circumferential direction of the torus. , forming protrusions that protrude in the vertical direction of the periphery on the side opposite to the toroidal coil side and in the outside direction with respect to the inside of the torus, and integrally forming the outer periphery shape in cross section to be approximately cross-shaped; In order to support the upper and lower portions of the toroidal coil support, disc-shaped upper and lower bases arranged vertically along the circumferential direction of the torus of the vacuum container are formed with a substantially hat-shaped cross section;
The concave portions of the upper and lower bases, which have a roughly hat-shaped cross section, cover and support the vertical protrusion of the toroidal coil support, and the top and bottom bases have flange portions that protrude inwardly and outwardly from the torus at their tips. The intended purpose is achieved by holding the protruding portions protruding inside and outside the torus of the toroidal coil support.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 3 shows an embodiment of the present invention.

As shown in the figure, in this embodiment, a toroidal coil support 3 that covers and holds the outer periphery of each toroidal coil 7 is used.
6 is formed with protrusions 36A, 36B, 36C, and 36D whose outer periphery on the side opposite to the toroidal coil T side protrudes in the vertical direction and in the inner and outer directions of the torus, and
The protrusions 36A, 36B, 36C, and 36D are integrally formed and have a cross-sectional outer circumferential shape approximately cross-shaped.

Furthermore, the upper base 45 and the lower base 41 that support the conotroidal coil support 36 are formed symmetrically to each other,
Further, the upper base 45 is integrally formed with ring-shaped base parts 22 and 23 at its inner and outer peripheral edges, and the ring-shaped base parts 22 and 23 are slightly extended in the side direction of the lower base 41, and have a flange at the extended end. Parts 22a, 23
They each have a substantially hat-shaped cross section, and have the same structure all around.

On the other hand, the lower base 1 also has ring-shaped bases 24, 25,
and flange portions 24a, 25a, respectively, and are formed into a substantially hat-shaped cross section with the same structure all around.

Then, the upper protrusion 36A of the toroidal coil support 36 is covered with the recess of the upper base 45 having such a shape,
Toroidal coil support 36 in the recess of the lower base 41
It covers and supports the downward protrusion 36B of.

At this time, the inner surfaces of the flanges 22a, 23a, 24a, and 25a, which are provided at the tips of the upper base 45 and the lower base 41 and project to the inside and outside of the torus, respectively, project to the inside and outside of the torus of the toroidal coil support 36. It holds the protruding parts 36C and 36D.

Therefore, the electromagnetic force FR of the toroidal coil 7 acting toward the center of the torus can be received by supporting the toroidal coil support 36 on the inner surfaces 26, 27 of the ring-shaped base portions 22.24 of the upper and lower bases 41.45. ,
Further, the electromagnetic force Ft of the toroidal coil 7 acting in the circumferential direction of the torus is caused by the flat bottom surface 28.29 having a constant depth all around the upper and lower bases 41.45, the flange portions 22a, 23a,
This can be received by supporting the toroidal coil support 36 on the flange surfaces 30, 31, 32, 33 of 24a, 25a.

In addition, the vertical magnetic field coil 12.13 and the unwinding coil 16.1
7 are added to the ring-shaped base portions 22, 23, 24, and 25, respectively.

According to the configuration of this embodiment, in response to the electromagnetic force FR in the direction of the center of the torus, the upper base 45 and the lower base 41 are exposed to the inner surface 26.27 of the ring-shaped base portion 22.24 on the inner peripheral side. By holding the toroidal coil support 36 in place, the internal force acting on the toroidal coil 7 can be significantly reduced.

That is, the support point is closer to the center of the toroidal coil 7, and the outer circumferences of the link-shaped base parts 22, 23, 24, 25 of the upper base 45 and lower base 41 are thick, so the contact surface pressure is reduced and the rigidity is increased. Since this greatly improves the internal force acting on the toroidal coil 7, it is possible to significantly reduce the internal force acting on the toroidal coil 7.

On the other hand, in Fig. 4, one toroidal coil 7 is shown as in Fig. 2.
shows the distribution of electromagnetic force in the circumferential direction of the torus generated from
The average value of this electromagnetic force is indicated by FA.

In addition, in the figure, 36a indicates the upper part of the toroidal coil support 36, and 36b indicates the lower part of the toroidal coil support 36.

As is clear from the figure, the toroidal coil support 3
The support position of the lower part 36b of 6, that is, the distance t2 between the 7 flange surface 32 and the load point becomes smaller, and the toroidal coil 7
The bending stress acting on the toroidal coil support 36 is significantly reduced.

To explain in more detail, comparing FIG. 2 which shows the conventional one and FIG. 4 which shows the present invention, the amount of deformation δ is shown by the following formula based on the general formula for bending deformation.

In this equation, since the bending stiffness (E■) and the electromagnetic force (Ft) are the same between the conventional one and the present invention, the amount of deformation δ is 3 of the distance t.
It will be proportional to the power.

That is, (t1/t2)3, 4=1/2L1
Then, if the distance t becomes 1/2, eight times the stiffness will be obtained.

Therefore, the bending stress in the circumferential direction of the torus is reduced.

According to the torus-shaped fusion device of the present invention explained above,
A toroidal coil support that encloses a nearly annular vacuum container that stores plasma inside and covers and holds the outer periphery of each of a plurality of toroidal coils arranged at predetermined intervals in the circumferential direction of the torus. The toroidal coil support is formed with a protrusion that protrudes in the vertical direction of the periphery on the opposite side and in the inner and outer directions of the torus, and is integrally formed so that the cross-sectional outer circumferential shape is approximately cross-shaped, and the toroidal coil support In order to support the upper and lower parts, disc-shaped upper and lower bases arranged vertically along the circumferential direction of the torus of the vacuum container are formed with a substantially hat-shaped cross section, and a toroidal coil is formed in the concave portion of the upper and lower bases, which have a substantially hat-shaped cross section. The support covers and supports the vertically protruding part of the support, and has a flange part at the tip of the upper and lower bases that protrudes to the inside and outside of the torus, and the flange part protrudes to the inside and outside of the torus of the toroidal coil support. Even if a huge electromagnetic force is generated, the toroidal coil can support the force acting on the toroidal coil in the direction toward the center of the toroid, and the bending stress acting in the circumferential direction of the toroid can be reduced. This improves rigidity, stabilizes the magnetic field when energized, and produces good plasma, making it very effective when used in this type of nuclear fusion device.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a conventional torus-shaped fusion device;
FIG. 2 is a partial sectional view taken along line A-A in FIG. It is a partial sectional view taken along the B line. 1,41... Lower base, 2... Floor, 3... Frame, 5,45... Upper base, 6,36 Curved Roy Dalcoil support, 7...
... Toroidal coil, 8 ... Vacuum container, 9
...Plasma, 12, 13... Vertical magnetic field coil, 22, 23, 24, 25... Ring-shaped base part, 22a, 23a, 24a, 25a - flange part, 36A, 36B, 36C, 36D...Protrusion parts.

Claims (1)

[Claims] 1. A substantially annular vacuum container that stores plasma therein, a plurality of toroidal coils surrounding the vacuum container and arranged at predetermined intervals in the circumferential direction of the torus, and covering the outer periphery of each of the toroidal coils. A toroidal coil support is provided to hold the toroidal coil support, and disc-shaped upper and lower bases are arranged vertically along the circumferential direction of the torus of the vacuum container in order to support the upper and lower parts of the toroidal coil support, and the upper and lower bases are connected to each other via a frame. In the toroidal fusion device, each of the toroidal coil supports is supported on a floor surface and holds the toroidal coils, and each of the toroidal coil supports supports the toroidal coils in the up-down direction of the periphery opposite to the toroidal coil side, and in the inside and outside directions of the torus. The upper and lower bases are formed into a substantially hat-shaped cross section, and the upper and lower bases are formed into a substantially hat-shaped cross section, and the upper and lower bases are formed integrally with each other so as to have a substantially cross-shaped outer circumferential shape, and the top and bottom bases are formed into a substantially hat-shaped cross section. The flange portion has a flange portion that protrudes from the torus, and covers and supports the vertical protrusion portion of the toroidal coil support with a concave portion of the upper and lower bases having a substantially hat-shaped cross section, and protrudes to the inside and outside of the torus. A torus-shaped nuclear fusion device characterized in that the toroidal coil support has protrusions that protrude inside and outside the torus.