抄録
A race-track configuration, which consists of pairs of mirror and U-bend along with four poloidal divertors, is examined as a reactor operated in steady-state with the two-energy-component or the beam driven scheme. The each straight section is a long simple mirror, where the plasma is expected to be hydromagnetically stable stemming from the line tying on the magnetic neutral lines of the poloidal divertors and a dynamic stabilization of the radio-frequency electric field applied in the mirror sections. The 1=2 stellarator and the bumpy torus configurations are considered as the candidates of U-bend sections, especially the former configuration is examined related to the connection between mirror field and stellarator field which is produced with the circular coils and the ferro-magnetic materials. The T ion concentration in plasma is expected to be controllable by the ponderomotive force acting selectively on the T ions with the radio-frequency field applied at exits of the divertors. The estimation shows that the plasma Qp is about 3, and 80 percent or more of the reaction takes place in the mirror sections, assuming that the injection energy of neutral particles, E0 = 200keV, n = 1014cm-3, Te = 15 keV, and plasma loss time, Te = 0.477 sec.
