JPS648315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diverter for a nuclear fusion device, and more particularly to a diverter for a nuclear fusion device installed near an exhaust duct for particle neutralization of the nuclear fusion device.

2. Description of the Related Art Diverters have conventionally been used in nuclear fusion devices, ion accelerators, and the like to neutralize ionized particles. This diverter is arranged so that a plate with a cooling pipe through which a coolant flows is cut across the magnetic field lines.

FIG. 1 shows a partial cross-sectional view of a nuclear fusion device using a conventional divertor. In the figure, 1 is a plasma, 2 is a blanket for plasma confinement, and 3 is a plasma confinement blanket.
is a shield, 4 is a droidal coil, 5 is a poloidal coil, and 6 is a diverter.

A detailed diagram of a conventional diverter 6 is shown in FIG. The diverter 6 includes a header 7 for the inlet and outlet of the coolant, a cooling tube group 8 in which a plurality of cooling tubes are connected at both ends to both headers and through which the coolant flows, and a plate cooled by the cooling tube group ( (Illustrations omitted)
It consists of In the figure, an arrow 9 indicates the direction of an eddy current generated when the plasma 1 disappears in a very short time. The direction of the electromagnetic force generated at this time is indicated by an arrow 10. At this time, an eddy current loop (hereinafter simply referred to as a loop) formed in the cooling tube group 8 and the inlet and outlet headers 7 becomes as shown in FIG.

As shown in FIG. 3, in the diverter 6 of the conventional fusion device, the inlet and outlet headers 7 are arranged separately, so the cooling tube group 8 making up the diverter 6 and the inlet and outlet headers are separated. The loop created by 7 forms a large area. For this reason,
When the plasma 1 disappears in an extremely short time (about 10ms), a large eddy current is generated, and this eddy current and the magnetic field created by the toroidal coil 4 generate a large electromagnetic force (about 5t/m). There was a risk that the diverter 6 would be damaged by this electromagnetic force. That is,
The electromagnetic force generated when plasma 1 disappears is
It is generated by the vector product j→×B→ _t of the eddy current j→ caused by a change in the plasma current and the magnetic field B→t created by the toroidal coil 4. The eddy current j generated in the diverter 6 is caused by a time change in the magnetic flux density B _o perpendicular to the surface S that passes through the surface S formed by the loop formed by the cooling tube group 8 and the entrance/exit header 7 that make up the diverter 6. given by.
That is, it is expressed by the following formula.

j=-1/R d/dt∫ _s B _o ds (R is the electrical resistance of the loop).

However, as described above, in the diverter 6 of the conventional fusion device, the inlet/outlet header 7 is arranged at a distance, so the cooling tube group 8 and the header 7 form a loop having a large area. For this reason, the eddy current j given by the above-mentioned formula becomes a large value, and the diverter 6 ends up being damaged by the electromagnetic force.

The present invention has been made in view of the above points, and its purpose is to reduce the magnitude of eddy current to a value close to zero even in a device composed of a group of cooling tubes and a header. An object of the present invention is to provide a diverter for a nuclear fusion device that is not damaged by electromagnetic force.

The present invention provides a diverter provided near the inlet side of an exhaust duct of a plasma confinement blanket, in which an outlet header and an inlet header are arranged adjacent to each other for introducing and removing coolant into a group of cooling pipes through which coolant flows. The desired purpose is achieved by forming each cooling pipe of the cooling pipe group into a folded shape and connecting it to the adjacently arranged inlet header and outlet header.

The present invention will be described below based on embodiments shown in the drawings. Components that are the same as those in the prior art will be explained using the same reference numerals.

FIG. 4, FIG. 5, and FIG. 6 show a diverter 6 (plate not shown) which is an embodiment of the present invention. The other structures are almost the same as those of the conventional structure, so the explanation here will be omitted.

In this embodiment shown in the figure, the inlet and outlet side headers 7 are arranged adjacently at substantially the same position,
A diverter 6 is formed by a cooling tube group 8 made up of two pairs (only two pairs at both ends are shown).

According to the configuration of the diverter 6 of this embodiment, the loop created by the cooling tube group 8 and the inlet/outlet header 7 is as shown in FIG. 7, which is different from the loop created by the conventional diverter 6 in FIG. , Comparing the loop formed by the diverter 6 of this embodiment in FIG. 7, the area of the surface formed by the loop in this embodiment is
Since it is closer to zero than in FIG. 3, even if the plasma current disappears in an extremely short time, no large eddy current is generated. Therefore, no large electromagnetic force is generated, and the diverter 6 will not be damaged.

According to the diverter of the nuclear fusion device of the present invention described above, the outlet header and the inlet header, which take coolant in and out of the cooling tube group, are installed adjacent to each other. Since the loop that is generated can be made small, large electromagnetic force is not generated, and damage to the diverter can be prevented.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a fusion device, FIG. 2 is a perspective view showing a diverter of a conventional fusion device,
FIG. 3 is a diagram showing a loop formed in a conventional diverter, FIG. 4 is a perspective view showing an embodiment of the diverter of the fusion device of the present invention, FIG. 5 is a side view thereof, and FIG. 6 is a diagram thereof. The front view, FIG. 7, is a diagram showing a loop formed in a diverter according to an embodiment of the present invention. 1... Plasma, 2... Blanket, 3... Shielding body, 4... Traidal coil, 5... Poloidal coil, 6... Diverter plate, 7... Header, 8
... Cooling pipe group, 9 ... Direction of eddy current, 10 ... Direction of electromagnetic force.

Claims (1)

[Scope of Claims] 1. A cooling pipe group including an outlet header and an inlet header for taking in and out coolant, a plurality of cooling pipes connected at both ends to the headers and through which the coolant flows, and a cooling pipe group formed by the cooling pipe group. In the diverter for a nuclear fusion device, the outlet header and the inlet header are arranged adjacent to each other, and each cooling pipe of the cooling pipe group is formed into a folded shape so that the adjacently arranged outlet A diverter for a nuclear fusion device, characterized in that it is connected to a header and an inlet header.