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Effect of magnetic structure on RF-induced breakdown in QUEST
https://repo.qst.go.jp/records/48950
https://repo.qst.go.jp/records/4895042fcf37b-a254-423f-8684-8036127c44a7
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-05-11 | |||||
| タイトル | ||||||
| タイトル | Effect of magnetic structure on RF-induced breakdown in QUEST | |||||
| 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 |
Yoneda, R.
× Yoneda, R.× Hanada, K.× Nakamura, K.× Idei, H.× Yoshida, N.× Hasegawa, M.× Onchi, T.× Kuroda, K.× Kawasaki, S.× Higashijima, A.× Nagata, T.× Isayama, A.× Mitarai, O.× Fukuyama, A.× Y.Takase× 諫山 明彦 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In tokamak operations, breakdown of plasma is the first step of the plasma build-up. In this paper, we present a combinative investigation of radio frequency (RF)-induced breakdown experiments in QUEST (Q-shu University Experiment with Steady-State Spherical Tokamak) and a one-point model of hydrogen ionization. Experimental results with two different frequencies of 2.45 GHz and 8.2 GHz showed that the clear threshold on connection length, L , existed for breakdown with a negative n- index configuration n =(dR/dBv)/(dBv/dR) , where R is the major radius and Bv the is vertical magnetic field. In contrast, breakdown was always obtained with positive n -index when changing L. It indicates that a lifetime of an incubated electron plays a significant role in the plasma breakdown. According to one-point model calculation, the experimental threshold of L is well predicted by the lifetime of the incubated electron estimated by employing the loss term along with L . The model calculation also describes the requirement of the minimum electron temperature Te for RF-induced breakdown to realize an avalanche of electrons in the tokamak magnetic structure. | |||||
| 書誌情報 |
Physics of Plasmas 巻 24, 号 6, p. 062513-1-062513-10, 発行日 2017-06 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1063/1.4985142 | |||||
