Kakuyūgō kenkyū

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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 Q_p 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, T_e = 15 keV, and plasma loss time, T_e = 0.477 sec.

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