JPH0114554B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic limiter cooling device for a nuclear fusion device.

An overview of conventional nuclear fusion devices and their problems will be explained based on FIGS. 1 to 5. Figure 1 is a partially cutaway plan view of the nuclear fusion device, and Figure 2 is the top view of the fusion device.
FIG. 3 is a vertical cross-sectional view of the vacuum container. A vacuum container 2 for holding plasma 1 is an annular body consisting of a thick wall portion 2A and a bellows portion 2B, and is arranged within a large number of toroidal magnetic field coils 3, and the inside thereof is evacuated by a vacuum evacuation device 4. . The outer poloidal magnetic field coils 5A and 5B serve as primary windings that generate an annular discharge current in the plasma, and the inner poloidal magnetic field coils 6
A, 6B, and 6C form a separatrix magnetic surface 7 and serve to remove impurities flowing into the plasma 1 to the outside. Since a portion of the plasma 1 wraps around the separatrix magnetic surface 7, the ends of the separatrix magnetic surface 7 must be cooled by the magnetic limiter cooling ducts 8A and 8B. For this purpose, refrigerant is flowed through the magnetic limiter cooling ducts 8A, 8B through pipes 9A, 9B. Note that 10 is a current transformer, and 11A and 11B are bases.

By the way, magnetic limiter cooling ducts 8A and 8B
As is clear from the partially cutaway plan view of the vacuum container 2 shown in FIG. 4 and the enlarged plan view shown in FIG. 5 (corresponding to the − section in FIG. 2), It is divided at predetermined pitches and placed around the entire circumference. Then, the supply pipe 9A ₁ and the discharge pipe 9A ₂ connected to the magnetic limiter cooling duct 8A at a predetermined interval in the torus direction are led out through the wall of the vacuum vessel 2, and
The refrigerant is made to flow into the magnetic limiter cooling duct 8A through these pipes 9A ₁ and 9A ₂ . However, if the refrigerant flow path is configured in this way, the vacuum container 2
and magnetic limiter cooling duct 8A and pipe 9A ₁ ,
Points A, B, C, shown in Figure 5 with 9A ₂ as elements,
An electrical closed circuit is formed through D, and the vertical magnetic flux 12 generated by the poloidal magnetic field coils 5A, 5B, 6A to 6C passes through this closed circuit. Therefore, when plasma is generated, an electromotive force is generated in this closed circuit and a circulating current flows, and due to the interaction between this current and the poloidal magnetic field, an excessive electromagnetic force is generated in the supply pipe 9A ₁ and the discharge pipe 9A ₂ , causing a magnetic limiter. There is a risk of destroying the cooling mechanism.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent or reduce the generation of circulating current in a magnetic limiter cooling device for a nuclear fusion device as described above, thereby preventing destruction of the magnetic limiter cooling mechanism.

In order to achieve this objective, in the present invention, the inside of the cooling duct of the magnetic limiter placed at the end of the magnetic surface of the separator for removing impurities in the plasma is partitioned by a partition wall in the flow direction of the magnetic flux of the poloidal magnetic field. Two cooling chambers are provided, each cooling chamber is connected at both ends, and the supply pipe is connected to one of the cooling chambers, and the discharge pipe is connected to the other cooling chamber, and the supply pipe and the discharge pipe are connected to each other. ,
It is characterized in that the position is equal to the position in the direction perpendicular to the direction of the magnetic flux of the poloidal magnetic field.

Hereinafter, the present invention will be explained based on illustrated embodiments. Fig. 6 is a longitudinal cross-sectional view of the magnetic limiter cooling device, and Fig. 7 is a cross-sectional view of the magnetic limiter cooling device in Fig. 6. These show the magnetic limiter cooling duct on one side, but the magnetic limiter cooling duct on the other side has the same structure. be done.

Inside the magnetic limiter cooling duct 13 is a partition wall 13A.
Thus, cooling chambers 13B and 13C are formed which are separated in the flow direction of the magnetic flux of the poloidal magnetic field and communicated at both ends. The supply pipe 14A is connected to the cooling chamber 13B, and the discharge pipe 14B is connected to the magnetic limiter cooling duct 13 so as to communicate with the cooling chamber 13C. At this time, the positions of the supply pipe 14A and the discharge pipe 14B are made equal in the direction perpendicular to the direction of the magnetic flux of the poloidal magnetic field, so that the positions of the supply pipe 14A and the discharge pipe 14B are the same in the direction perpendicular to the direction of the magnetic flux of the poloidal magnetic field.
4A and the discharge pipe 14B so as not to intersect with the magnetic flux generated by the poloidal magnetic field coil 6B or the like.

By doing this, the refrigerant supplied from the supply pipe 14A to the cooling chamber 13B is
After dividing the flow, it flows into the cooling chamber 13C from both ends, and then flows through a flow path that is discharged from the discharge pipe 14B to cool the magnetic limiter cooling duct 13. As described above, the electrical closed circuit constituted by the vacuum vessel 2, the magnetic limiter cooling duct 13, the supply pipe 14A, and the discharge pipe 14B does not intersect with the magnetic flux generated by the poloidal magnetic field coil 6B, etc., so that when plasma is generated, No electromotive force is generated in the closed circuit and no circulating current flows,
Therefore, destruction of the magnetic limiter cooling mechanism due to electromagnetic force can be prevented.

According to the magnetic limiter cooling device for a nuclear fusion device of the present invention described above, the magnetic flux of the poloidal magnetic field flows through the magnetic limiter cooling duct arranged at the end of the magnetic surface of the separator for removing impurities in plasma. The cooling chambers are partitioned in the direction by a partition wall to form two cooling chambers, each of the cooling chambers is communicated at both ends, and the supply pipe is connected to one of the cooling chambers, and the discharge pipe is connected to the other cooling chamber, and Since the supply pipe and the discharge pipe are placed at the same position perpendicular to the direction of the magnetic flux of the poloidal magnetic field, the closed circuit formed by the vacuum vessel, magnetic limiter cooling duct, and pipe does not intersect with the magnetic flux generated by the poloidal coil. Since the generation of circulating current can be prevented or reduced, the magnetic limiter cooling mechanism can be prevented from being destroyed.

[Brief explanation of drawings]

Figures 1 to 5 show conventional nuclear fusion devices. Figure 1 is a partially cutaway plan view of the fusion device, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of Figure 1. 4 is a partially cutaway plan view of the vacuum container, and FIG. 5 is an enlarged plan view thereof. 6 and 7 show one embodiment of the present invention, FIG. 6 being a longitudinal sectional end view of a magnetic limiter cooling device for a nuclear fusion device, and FIG. 7 being a sectional view thereof. 13... Magnetic limiter cooling duct, 14A...
Supply pipe, 14B...Discharge pipe.

Claims (1)

[Claims] 1. A magnetic fusion device equipped with a magnetic limiter cooling duct arranged at the end of a separatrix magnetic surface for removing impurities in plasma, a supply pipe for flowing a coolant into the magnetic limiter cooling duct, and a discharge pipe. In the limiter cooling device, the inside of the magnetic limiter cooling duct is divided into two cooling chambers by a partition wall in the flow direction of the magnetic flux of the poloidal magnetic field, and each cooling chamber is communicated at both ends, and one of the cooling chambers is For a nuclear fusion device, characterized in that the supply pipe is coupled to the other cooling chamber and the discharge pipe is arranged at the same position in the direction perpendicular to the direction of the magnetic flux of the poloidal magnetic field. Magnetic limiter cooling device.