JPS5919886A - Reverse magnetic field pinch type fusion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse magnetic field pinch type nuclear fusion device, and more specifically, to a reverse magnetic field pinch type nuclear fusion device equipped with means for controlling the position of a plasma column.

Figure 1 shows the conventional reverse magnetic field pinch type nuclear fusion device @ (hereinafter referred to as RFP).
(abbreviated as) - toroidal coil l.

Boroidal coil container, vacuum container 3. It was composed of an iron core, JtC empty bong S, and toroidal shell 6, 7
shows the plasma generated in the vacuum vessel 3, and shows an observation window. In the RFP having such a configuration, the vacuum container 3 is brought to an ultra-high vacuum by the vacuum pump S, gas is then introduced into the vacuum container J, and a flow II is caused to flow through the toroidal coil L and the voloidal coil. Plasma 7 is generated. At this time, a large toroidal current flows through the plasma 7, and due to the eddy current induced in the toroidal coil or the vacuum vessel 3 by this current,
The plasma 7 is balanced. In addition, in this device, due to the perpendicular magnetic field leaking from the boroidal coil coil,
The plasma 7 is balanced.

However, in conventional RFPs such as 1 or more.

In order to achieve plasma equilibrium, a toroidal shell 6 was used or a perpendicular magnetic field was applied by a voloidal coil, which resulted in lack of stability for long discharge times.

Precise control of the plasma column was difficult.

This invention was made in order to solve the problems of the conventional apparatus as described above, and is an RFP that can precisely control the position of the plasma column.7. The main purpose is to provide

Another object of the present invention is to provide a conventional device with a thin vertical magnetic field coil, provide a position detector for optically or magnetically detecting the position of the plasma column, and interlock the vertical magnetic field coil with the position detector. An object of the present invention is to provide an RFP r that can accurately control the position of a plasma column and lengthen the plasma confinement time by performing feedback control.

An embodiment of the present invention will be described below with reference to FIG.

Figure 2 is an enlarged schematic diagram of some of the main parts of the RFP using the μ cylindrical coordinate system (Jψ, Z).
Voloidal coil 2,8 empty capacity: ÷3. A conventional device comprising an iron core, a toroidal shell A, etc. is provided with plasma position detectors 10a, 10b4--proximate to a vacuum vessel 3, facing a vertical magnetic field 9 and a large radius (R) direction. This position detector may be optical or magnetic.

Next, the operation will be explained.6] The direction of the toroidal current is the coordinate ψ direction, and the explanation up to the generation of the plasma 7 is the same as that of the conventional device.6 Due to the plasma pressure and toroidal device associated with the generation of the plasma 7, The plasma column expands in the direction of increasing radius, that is, outward. In addition, a plasma current flows through the plasma column at right angles to the plane of the μ paper. At this time, the position of the plasma column is detected by the position detectors 10a and 10b, and if the plasma column is moving outward, a vertical magnetic field coiler is used to increase the current flowing and displace the plasma column inward. .

Further, when the plasma column is moving inward, feedback control is performed so that the current of the vertical magnetic field coil is lowered so that the plasma column comes to the center of the vacuum vessel 3.

The invention by Nao and Ko can be applied to an RFP plasma experiment device or a nuclear fusion reactor to produce similar effects.

Moreover, it is effective when applied to RFP in which a helical magnetic field coil is formed into a thin film.

According to this invention, since the vertical magnetic field coil is configured to perform feedback control in conjunction with the position detector, the plasma generation time becomes longer and the energy loss from the glass T is reduced. This has the effect of increasing the plasma temperature and density.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a conventional device, and FIG. 2 is a partially enlarged cross-sectional schematic diagram showing an embodiment of the present invention in a cylindrical coordinate system. l... Toroidal coil, 2... Voloidal coil, 3... Vacuum vessel, 4t... Iron core, 3.・・Vacuum bonder + 6・・Toroidal shell, ri・・Vertical magnetic field coil,
/(7a, 10b...Position detector. In each figure, the same reference numerals indicate the same or corresponding parts.6 Agent Shin Kuzuno -

Claims (1)

[Scope of Claims] (1) In a reverse magnetic field pinch type nuclear fusion device comprising a vacuum vessel provided with a toroidal shell, a toroidal coil, and a voloidal coil, the This is a reverse magnetic field pinch type fusion device featuring a Narukokichi system, which is equipped with a position detector for the plasma column generated by the plasma column, and a vertical magnetic field coil that is feedback-controlled by the signal from this position detector. (g) An inverse magnetic field pinch type fusion device according to claim 1, comprising l pairs of position detectors arranged facing each other in a large radial direction. (3) The reverse magnetic field pinch type nuclear fusion device according to claim 1, which is provided with a helical magnetic field coil.