Plasma focus from the view point of intense neutron source is reviewed. Three types of the scenarios for the neutron generation are concluded to be possible, i. e. i) the repetitive plasma focus, ii) the high voltage plasma focus and iii) the plasma focus breeder.
A two stage Venetian blind direct energy converter was studied experimentally. Characteristic of current collection was in good agreement with a calculation based on a particle orbit. A three stage converter was designed according to this result.
A new helicity integral which denotes the degree of knottedness of the plasma current is introduced with respect to confined plasmas. Time evolutional equations of both magnetic and current helicities are derived in case of the presence of the electric resistivity. Both integrals decrease with respect to the time when the system is enclosed by a perfectly conducting rigid wall.
We have investigated the behavior of neutral particles in a hydrogen plasma with a small tokamak NOVA-II by means of Ha line intensity measurement. Our particular attention was paid to the contribution of a limiter to the recycling and equilibrium balance of plasma particles. Hα line intensity at the limiter was three times as strong as those at other positions. Transport of the injected neutrals by gas puffing in the toroidal direction was also investigated. No direct contribution of injected neutrals was observed at the positions +/-90 degrees away from the gas injection valve in the toroidal direction.