磁界によるプラズマの加速 : プラズマ銃と磁気進行波ピストン

概要

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We performed the experiments on the plasma accelerators of two types. One is a rail type plasma gun and another is a travelling magnetic wave accelerator. In the former type, the plasma is accelerated by Lorentz force of the electric current and in the later type, the magnetic, piston which travels along the electric delay line acts as the drivings force. In both we measured the electric current, the velocity of plasma, some propagation characteristics, electron temperature and ion density by using a coaxial shunt, a streak camera, a Faraday cell camera, a photo-multiplier and floating double probes. The maximum velocity of plasma was 5 × 106cm/sec for, a rod-rail type gun, 5.8 × 106cm/sec for a half-cylindrical rail type gun and 10 × 106cm/sec for the magnetic piston type. One of the important conditions for the acceleration was the distribution of the magnetic field. It was improved by varying the types of rails of the plasma gun and by changing the design of delay line on the magnetic piston type. The ion density of accelerated plasma bundle was about 108cm-3. The experiment on injection of plasma to the magnetic bottle and the ion density measurement by resonance probes are now going on.
社団法人プラズマ・核融合学会の論文