JPS58175300A - Magnetic field generator - 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 magnetic field generator, and more particularly to a magnetic field generator for generating plasma and confining it.

Conventionally, as this type of magnetic field generating device, one shown in FIG. 1 is known. FIG. 1 is a circuit diagram of a magnetic field generator using a conventional power crowbar circuit, and FIG. 2 is a discharge waveform characteristic diagram of the circuit shown in FIG. In Figure 1, l
, 5 is a capacitor, capacitor, 2.6 is a start switch, 3 is a chronograph (- switch, 4 is a load coil, 7 is a low inductance transformer, which is electromagnetically coupled to the load coil 4. 8 is a power crowbar) The circuit consists of a capacitor 5, a start switch 6, and a low inductance transformer 7 surrounded by dotted lines.

Next, the operation shown in the w41 diagram above will be explained. First, after both capacitors 1 and 5 are charged, each start switch 2.6 is simultaneously closed to allow current to flow through the load coil 4.

Next, when the current flowing through the load coil 4 reaches one point of the crowbar shown in FIG. 2, the crowbar switch 3 is closed.

At this time, if the work roper circuit 8 does not exist, the current of the load coil 4 will be like the discharge waveform lO shown by the dashed line in the figure f442, but in reality, the power Because of the crowbar circuit 8, the current has a discharge waveform 9 shown by the solid line in the m2 diagram. This allows the load coil 4 to obtain an ultra-long pulsed magnetic field with a quick rise. Note that the discharge waveform 11 shown by the dotted line in FIG. 2 is a waveform when the crowbar switch 3 is not closed at one point of the crowbar.

Since the conventional magnetic field generator using the power crowbar circuit is constructed as described above, a large-capacity, low-inductance transformer is required for the power crowbar, which inevitably becomes expensive and difficult to manufacture. Become. Also,
A crowbar switch has low inductance and
Because large currents flow for long periods of time, they were difficult to design and manufacture, and required extreme caution when operating. moreover,
The use of a low-inductance transformer that is electromagnetically coupled to the load coil results in a relatively large circuit inductance, which has various drawbacks, such as making it difficult to obtain a pulse with a fast rise.

The present invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it electromagnetically couples a circuit that performs fast discharge and a circuit that performs slow discharge, and overlaps the magnetic fields created by each circuit. It is an object of the present invention to provide a magnetic field generating device which has a configuration for generating and controlling a magnetic field and can be constructed at low cost without requiring a low inductance transformer for a power crowbar.

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

FIG. 3(A) is a coil arrangement diagram of a magnetic field generator according to an embodiment of the present invention, FIGS. The figure is a magnetic field waveform characteristic diagram created by each circuit shown in Figures 3ffl and (q.
The coil arrangement 20 surrounded by the dotted line shown in pronation includes f43
However, the coil 21 of the 1o circuit 27 surrounded by the dotted line in Figure 1 and the third
The circuit 27 is arranged so as to be electromagnetically coupled to the coil 22 (23) of the circuit 30 surrounded by the dotted line in FIG. Clover switch 2
It consists of 6.゛Mat:, rcJJ road 3
It is composed of a 0 Li coil 22 (23), a slow capacitor 28, and a start switch 29.

Next, the operations shown in FIGS. 3(5) to q will be explained. First, each capacitor 24, 28 is charged, and then the start switch 25 of the circuit 27 is closed. When the crowbar switch 26 is closed after the generated magnetic field reaches the peak value at one point of the crowbar shown in FIG. 4, a magnetic field as shown in the magnetic field waveform 41 shown by the dotted line in FIG. 4 is obtained. Further, when the start switch 29 of the circuit 30 is closed at time 42, a magnetic field like the magnetic field waveform 43 shown by the dashed line in FIG. 4 can be obtained. Figure 3 (
The coils 22 and 23 shown in 5) are called Helmholtz type coils, and create a uniform magnetic field in the vicinity of the coil 21, so each coil 22 and 23
The magnetic field generated by this waveform becomes a magnetic field waveform 44 shown by a solid line in FIG. Therefore, the start switch 29 shown in FIG.
The closing time 42 can be set arbitrarily, and the magnetic field created thereby can be easily controlled.

Therefore, the magnetic field generating device of the present invention is particularly suitable for the conventional #-Pinch type fusion type positioning and fusion device M, Littl
e, W, E.

Quinn and F, L, R4be, Phys.
, Fluid 4 (1961) P, 711) when applied to the generation and control of magnetic fields, it produces exceptional effects.

Note that other coils may be added to the coils 22 and 23 in the above embodiment. In addition, the closing time of the crowbar switch 26 in the above embodiment does not necessarily have to be the peak value of one crowbar point of the magnetic field. You may do so.

As described above, according to the magnetic field generating device according to the present invention, a circuit that performs fast discharge and a circuit that performs slow discharge are electromagnetically coupled, and the magnetic fields generated by each of the circuits are superimposed. Because of this configuration, there is no need to use a high-performance crowbar switch,
In addition, it can be constructed at low cost without requiring a low inductance transformer for the power crowbar, and it also generates a magnetic field.

It has the excellent effect of being easily controlled.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a magnetic field generator using a conventional power crowbar circuit, Figure 2 is a discharge waveform characteristic diagram of the circuit shown in Figure 1, and Part 3 is a magnetic field generator according to an embodiment of the present invention. Coil layout diagram, V43 diagram (G) and (q is each circuit diagram configuring the magnetic field generator in the 3rd part, Figure 4 is the 3rd figure) and (q) Magnetic field waveform characteristics created by each circuit It is a diagram. 1.5, 24.28... Capacitor, 2
,6゜25.29...--Start switch,
3.26...-... Clover switch, 4,21
, 22.23...-... Coil, 7...
...Low inductance transformer, 8...
・・Power crowbar circuit, 9 = 10 * 11・
......Discharge waveform, 20...Coil arrangement, 27.30...Circuit, 4
1.43.44...-Magnetic field waveform, 42...
······time. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 (A) Figure 4

Claims (2)

[Claims] (1) A circuit that performs fast discharge and a circuit that performs slow discharge are electromagnetically coupled, and the magnetic fields created by each circuit are superimposed to generate and control the magnetic field. A magnetic field generator characterized by: (2) The coil of the slow discharge circuit is a Helmholtz type coil, and the discharge circuit is used to generate and control a θ-Pinch type nuclear fusion device type fusion device. The magnetic field generator according to item 1.