著者

Kenichi NAGAOKA Mitsutaka ISOBE Kazuo TOI Kazuyuki GOTO Masaki OSAKABE Tsuyoshi AKIYAMA Chihiro SUZUKI Shin NISHIMURA Yasuhiko TAKEIRI Kiyomasa Y. WATANABE Keisuke MATSUOKA Shoichi OKAMURA CHS experimental group

出版者

(社)プラズマ・核融合学会

雑誌

Plasma and Fusion Research (ISSN:18806821)

巻号頁・発行日

vol.2, pp.S1092-S1092, 2007 (Released:2008-02-26)

参考文献数

16

被引用文献数

5 4

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A hybrid directional probe method both “thermal and Langmuir probe” was applied for fast ion measurements in the compact helical system. In order to obtain absolute values of fast ion density and power density, a calibration of the probe was performed using neutral hydrogen beam and a mixture beam of hydrogen and proton, of which beam current and energy were controlled. The conversion factor from temperature increase of the probe head to local power density and secondary electron emission yield was obtained. The density of fast ions was obtained by directional thermal probe (DTP) method inside the last closed flux surface, and the density ratio was nFastIon/nBulkPlasma = 2.7 × 10-3 at r/a = 0.9. The observation of the directional Langmuir probe (DLP) method is consistent with the DTP results.