Electric Potential Structure in the Extraction Region of the Negative Hydrogen Ion Source*)

被引：0
|
作者：
Masaki S. [1 ]
Maeshiro K. [2 ]
Tsumori K. [1 ,3 ]
Wada M. [2 ]
机构：
[1] Department of Fusion Science, SOKENDAI (The Graduate University for Advanced Studies), Toki, 509-5292, Gifu
[2] chool of Science and Engineering, Doshisha University, Kyotanabe,Kyoto
[3] National Institute for Fusion Science, Toki, 509-5292, Gifu
来源：
Plasma and Fusion Research | 2019年 / 14卷
基金：
日本学术振兴会;
关键词：
filament material; Langmuir probe; negative hydrogen ion; negative ion extraction; plasma parameter;
D O I：
10.1585/PFR.14.3401136
中图分类号：
学科分类号：
摘要：
Plasma parameters were compared in the extraction region of a negative hydrogen (H-) ion source between the discharge sustained by tungsten (W) and tantalum (Ta) high temperature cathodes. A hydrogen plasma driven by the Ta filament showed lower electron temperature and higher ratio of positive ion saturation current to negative ion/electron saturation current than a plasma excited by the W filament. Plasma potential indicated different spatial distribution along the direction of H- ion extraction corresponding to the voltage biased on the plasma electrode. These results are correlated to the intensities of the H- ion extraction current. © 2019 The Japan Society of Plasma Science and Nuclear Fusion Research
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页码：1 / 5
页数：4
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