The influence of filament positions on the arc discharge characteristics of a negative hydrogen ion source for a neutral beam injector were studied by simulations and experiments. We have made a simulation code named which calculates the orbits of primary electrons emitted from cathode filaments, including collisions with gas molecules filled in the source, to obtain the spatial distribution of ionization points. We applied this code to a large negative hydrogen ion source having an external magnetic filter for LHD-NBI No. 1 (neutral beam injector 1 for a large helical device). As a result of the calculations, we have found that the moving area of emitted primary electrons differs markedly according to the filament positions. Calculation results agreed well with the experimental results of high-power arc discharge and the spatial distribution of plasma parameters obtained by Langmuir probe measurements. By applying to filament–arc ion sources, we can choose appropriate areas in arc chambers for filament positioning.
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Research Article|
May 01 1999
Effects of filament positions on the arc discharge characteristics of a negative hydrogen ion source for neutral beam injector
Shiro Asano;
Shiro Asano
Power and Industrial Systems Research and Development Center, Toshiba Corporation, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210-0862, Japan
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Katsuyoshi Tsumori;
Katsuyoshi Tsumori
Plasma Heating Division, Department of Large Helical Device Project, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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Toshihisa Okuyama;
Toshihisa Okuyama
Keihin Works, Toshiba Corporation, 2-4 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
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Yasuo Suzuki;
Yasuo Suzuki
Advanced Energy Development Department, Toshiba Corporation, 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-8510, Japan
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Masaki Osakabe;
Masaki Osakabe
Plasma Heating Division, Department of Large Helical Device Project, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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Yoshihide Oka;
Yoshihide Oka
Plasma Heating Division, Department of Large Helical Device Project, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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Yasuhiko Takeiri;
Yasuhiko Takeiri
Plasma Heating Division, Department of Large Helical Device Project, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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Osamu Kaneko
Osamu Kaneko
Plasma Heating Division, Department of Large Helical Device Project, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
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Rev. Sci. Instrum. 70, 2338–2344 (1999)
Article history
Received:
September 16 1998
Accepted:
January 19 1999
Citation
Shiro Asano, Katsuyoshi Tsumori, Toshihisa Okuyama, Yasuo Suzuki, Masaki Osakabe, Yoshihide Oka, Yasuhiko Takeiri, Osamu Kaneko; Effects of filament positions on the arc discharge characteristics of a negative hydrogen ion source for neutral beam injector. Rev. Sci. Instrum. 1 May 1999; 70 (5): 2338–2344. https://doi.org/10.1063/1.1149760
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