Characteristics of cesium-free negative hydrogen/deuterium ion source by sheet plasma

•We have designed the magnetized-sheet plasma.•The negative ions produce by volume production without Cs seeding.•The negative hydrogen /deuterium ions are successfully extracted.•This study clarified the basic characteristics of the developed system. The use of negative ion sources without Cs seedi...

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Bibliographic Details
Published in:Fusion engineering and design 2019-09, Vol.146, p.2721-2724
Main Authors: Hanai, Keito, Ishihara, Shogo, Endo, Ryuta, Takimoto, Toshikio, Tonegawa, Akira, Sato, Kohnosuke
Format: Article
Language:English
Subjects:
Cesium
Cs-free
Current density
Deuterium
Discharge
Hydrogen
Hydrogen ions
Ion beams
Ion sources
Negative ion source
Negative ions
Neutral beam heating
Neutral beams
Plasma
Plasmas
Sheet plasma
TPD-type plasma source
Volume production
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Summary:•We have designed the magnetized-sheet plasma.•The negative ions produce by volume production without Cs seeding.•The negative hydrogen /deuterium ions are successfully extracted.•This study clarified the basic characteristics of the developed system. The use of negative ion sources without Cs seeding is desired in neutral beam injectors of fusion experiments. We have designed a magnetized-sheet plasma that produces negative ions by volume production without Cs seeding. The developed system was experimentally tested on steady-state hydrogen and deuterium plasmas. The negative hydrogen ion beam was extracted by a two-grid extraction system located at the periphery of the sheet plasma. The negative hydrogen/deuterium ions were successfully extracted from the sheet plasma. The current densities of the ion beams increased with increasing discharge current. At an extraction voltage of 7 kV and a discharge current of 80 A, the approximate current densities of the negative hydrogen and deuterium ion beams were 3.8 and 1.2 mA/cm2, respectively.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2019.04.096