Buildup of hot-ions by neutral-beam injection into a target plasma in a mirror field is calculated. The main assumption is that the background neutrals which determine the charge-exchange loss time are originated from charge-exchange collision of the injected energetic neutrals with the target plasma. Electric power for confining magnet and pumping speed for evacuation are examined for the experiment of hot-ion buildup.
Propagation of the cold lower hybrid waves in a cylindrical and a cylindrical tokamak plasmas is studied. The trajectory of wave energy flow is spiral and arrives at the lower hybrid resonance layer along the poloidal field. At the same time, it travels along the toroidal direction, and its propagated distance to the resonance layer is equal to √M/m a, in order, where M (m) is the mass of ion (electron) and a is the radius of plasma column.