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Fujii Hiroyuki

Affiliate Master Yamaguchi University

Isotope effect and cesium dependence of negative ion production in volume H- and D- ion sources

Review of Scientific Instruments Volume 69 Issue 2 Page 941-943
published_at 1998-02
2007010071.pdf
[fulltext] 2.32 MB
Title
Isotope effect and cesium dependence of negative ion production in volume H- and D- ion sources
Creators Fukumasa Osamu
Creators Yoshino Kyogo
Isotope effect of H- and D- productions with and without cesium vapor injection is studied theoretically as a function of plasma parameters. Model calculation in a tandem volume source is performed by solving a set of particle balance equations for steady-state hydrogen and deuterium discharge plasmas. In a pure volume case, as a whole, H- production is higher than D- production for various plasma conditions. This isotope effect is caused by mainly atomic collision processes, i.e., collisional cooling of vibrational molecules and collisional destruction of negative ions. Therefore, density of atoms plays an important role for deciding negative ion density. On the other hand, in a cesium case, there is no remarkable isotope effect on H- /D- production. Considering H- /D- surface production caused by both atoms and positive ions, H- /D- production is enhanced by a large factor and then isotope effect observed in pure volume case seems to be almost masked.
Subjects
電気電子工学 ( Other)
Languages eng
Resource Type journal article
Publishers American Institute of Physics
Date Issued 1998-02
File Version Version of Record
Access Rights open access
Relations
[ISSN]0034-6748
[NCID]AA00817730
info:doi/10.1063/1.1148598
[isVersionOf] [URI]http://rsi.aip.org/rsi/
Schools 大学院理工学研究科(工学)