Numerical simulation on volume production of negative ions in hydrogen plasmas （ＩＩ） : Dependence of h^-production on plasma parameters

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

Numerical simulation on volume production of negative ions in hydrogen plasmas （ＩＩ） : Dependence of h^-production on plasma parameters

Creators Fukumasa Osamu

Creators Saeki Setsuo

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.

(c)プラズマ・核融合学会()

[ISSN]0451-2375

[NCID]AN00039568

[isVersionOf] [URI]https://www.jstage.jst.go.jp/article/jspf1958/56/6/56_6_409/_article/-char/ja/