Simulation of a Reversed-Field Theta-Pinch Plasma by a Zero-Dimensional Model Including Effect of Impurities

概要

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A zero-dimensional rigid rotor model is useful in investigating post-implosion behavior in a reversed-field theta-pinch plasma including impurities. The thermal sheath length δ and the inverse of the gradient length ε_n can be determined for the numerical calculation to give better agreement with the experimental results on the initial time behaviors of τ_p, τ^e_<th>, T_e and T_i, where τ_p is the particle confinement time, τ^e_<th> the thermal conduction time, and T_e and T_i are the electron and ion temperatures, respectively. The numerical results of the total electron number N_e, electron density n_e, energy confinement time τ_E, τ^e_<th>, T_e, and T_i, and energy flows with impurity for Z_<eff>=2 are closer to the experimental results than those without impurity for Z_<eff>=1, where Z_<eff>=2 is the effective ionic charge taken from the experimental measurement. The calculation shows that τ_E and τ^e_<th> are much more sensitive to Z_<eff> than τ_p is.
社団法人応用物理学会の論文
1984-09-20