水素放電による負イオン生成に関する数値計算-2-H-生成のプラズマパラメ-タ依存性

概要

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Dependence of H^- production on plasma parameters (i. e. electron density n_e, electron temperature T_e and hydrogen gas pressure p) is studied by using a set of particle balance equations in a steady state hydrogen plasma. The model includes six species of vibrationally excited hydrogen molecules H_2^*(vibrational level v"= 5-10) which are important for H^- production. Particular attention has also been paid to wall effects on H^- production. So, both the wall recombination coefficient γ1 for H and the wall de-excitation collision parameter γ2 for H_2^*(v") are treated as numerical parameters. With increasing T_e, H^- yield decreases. Both n_e and p have some optimum values for H^- production. The most significant point is that ion species ratios depend strongly not only on plasma parameters but also on wall parameters, i. e. γ1 and γ2. For H^- production, the optimum condition is that γ1 ≒ 1 and γ2 ≪ 1.
プラズマ・核融合学会の論文