Optical Measurement of Cesium Behavior in a Large H− Ion Source for a Neutral Beam Injector
スポンサーリンク
概要
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Optical emission in a negative hydrogen ion source for the Large Helical Device Neutral Beam Injector (LHD-NBI) has been measured to investigate the behavior of Cs. Two optical sight lines exist parallel to the plasma grid, in the discharge area and in the magnetic filter area near the plasma grid. In the discharge area, the spectrum intensity from Cs+ ions is considerably increased during 20 s of the beam extraction. This indicates a considerable increase in the Cs+ density inside the plasma due to the impact of back-streaming H+ ions. A strong neutral Cs spectrum is observed in the magnetic filter area, where the electron density is lower than in the discharge area. The rate of increase of neutral Cs is much enhanced after t = 30 s, probably because the Cs adsorbed on the cooled region inside the arc chamber evaporates because its temperature increases during the long pulse discharge.
著者
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KANEKO Osamu
National Insitute for Fusion Science
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IKEDA Katsunori
National Insitute for Fusion Science
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OSAKABE Masaki
National Insitute for Fusion Science
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TAKEIRI Yasuhiko
National Insitute for Fusion Science
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TSUMORI Katsuyoshi
National Insitute for Fusion Science
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NAKANO Haruhisa
National Institute for Fusion Science
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NAGAOKA Kenichi
National Institute for Fusion Science
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TAKEIRI Yasuhiko
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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IKEDA Katsunori
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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NAKANO Haruhisa
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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TSUMORI Katsuyoshi
National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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