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Study of seed plasma generation for NBI plasma start-up using non-resonant microwave launch in Heliotron J
https://repo.qst.go.jp/records/82470
https://repo.qst.go.jp/records/82470ef6e5bac-2807-442e-b7fc-4558271169e9
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-03-25 | |||||
| タイトル | ||||||
| タイトル | Study of seed plasma generation for NBI plasma start-up using non-resonant microwave launch in Heliotron J | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Kobayashi, Shinji
× Kobayashi, Shinji× Nagasaki, Kazunobu× Stange, T.× Mizuuchi, Tohru× Okada, Horoyuki× Minami, Takashi× Kado, Shinichiro× Satoshi, Yamamoto× Ohshima, Shinsuke× Hada, K.× Weir, G.M.× Konoshima, Shigeru× Nakamura, Yuji× Kemmochi, Naoki× Yoshiaki, Ohtani× Lu, X.X.× Panith, A.× Toi, Kazuo× SUZUKI, Yasuhiro× Nagasaki, Kazunobu× Mizuuchi, Tohru× Minami, Takashi× Kado, Shinichiro× Satoshi, Yamamoto× Yoshiaki, Ohtani |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Here, we report on a study of seed plasmas produced by non-resonant 2.45 GHz microwave heating in Heliotron J, which is useful for plasma start-up by neutral beam injection (NBI) under the conditions of low beam power (<1 MW), low accerelation voltage (<30 kV) and small device size (~1 m). The pre-ionization technique using the non-resonant heating produced the electron density in the order of 1017–1018 m−3 with the energy exceeds the CII ionization potential (30 eV). The existence of the relativistic electrons, which was essential to produce the seed plasmas, was confirmed experimentally during the pre-ionization phase by the synchrotron radiation and the hard x-ray emission measurements. The production mechanism of the relativistic electrons was considered to be stochastic interactions between the electrons and the microwave-frequency field. By optimizing the additional gas fueling during the microwave launch, a higher seed-plasma density more than 4 × 1018 m−3 was obtained, resulting that a rapid density evolution after NBI turn-on was successful even in the low NBI power (0.3 MW) condition. The seed plasmas produced by the pre-ionization method is useful to realize the plasma start-up under low absorption power condition in larger heliotron/stellarator devices such as perpendicular NBI in W7-X or deuterium NBI in LHD. | |||||
| 書誌情報 |
Plasma Physics and Controlled Fusion 巻 62, 号 6, p. 065009, 発行日 2020-05 |
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| 出版者 | ||||||
| 出版者 | IOPscience | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0741-3335 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6587/ab877e | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1361-6587/ab877e | |||||
