Parametric study of negative ion production in cesium seeded hydrogen plasmas

Parametric study of negative ion production in cesium seeded hydrogen plasmas

Creators Fukumasa Osamu

Creators Monji Hideki

Effects of cesium vapor injection on H? production in a tandem volume source are studied numerically as a function of plasma parameters. Model calculation is performed by solving a set of particle balance equations for steady-state hydrogen discharge plasmas. Here, the results with a focus on gas pressure dependence of H? volume production are presented and discussed. Considering H? surface production due to H atoms and positive hydrogen ions, enhancement of H? production and pressure dependence of H? production observed experimentally are qualitatively well reproduced in the model calculation, where stripping loss in the extraction and acceleration regions is taken into account. For pressure dependence of H? production with cesium, I.e., decrease in optimum pressure, H atoms play an important role. For enhancement of H? production, effect of so-called electron cooling is also briefly discussed.

[ISSN]0034-6748

[NCID]AA00817730

info:doi/10.1063/1.1150435

[isVersionOf] [URI]http://rsi.aip.org/rsi/