Modeling of negative ion production in hydrogen plasmas

Modeling of negative ion production in hydrogen plasmas

Creators Fukumasa Osamu

Effects of cesium vapor injection on H/sup -/ 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. The results with a focus on electron temperature and gas pressure dependence on H/sup -/ volume production are presented and discussed. Considering H/sup -/ surface production due to H atoms and positive hydrogen ions, enhancement of H/sup -/ production and pressure dependence of H/sup -/ 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 enhancement of H/sup $/production, so-called electron cooling in the source region, as well as in the extraction region, is not so effective if plasma parameters are initially optimized with the use of a magnetic filter.

c2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. IEEE Transactions on Plasma Science, vol. 28-3, 2000, 1009-1015()

[ISSN]0093-3813

[NCID]AA0066803X

https://doi.org/10.1109/27.887769