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Pre-ionization by AC Ohmic coil operation in the TST-2 spherical tokamak
https://repo.qst.go.jp/records/48971
https://repo.qst.go.jp/records/48971fd5a7d73-de6c-4d4f-9bfc-e1d4d2222df1
| 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 | Pre-ionization by AC Ohmic coil operation in the TST-2 spherical tokamak | |||||
| 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 |
Ejiri, A.
× Ejiri, A.× Takase, Y.× Tsujii, N.× Togashi, H.× Furui, H.× Shinya, takahiro× Roidl, B.× Sonehara, M.× Yajima, S.× Yoshida, Y.× Yamazaki, H.× Kitayama, A.× Sato, A.× Takei, Y.× Tajiri, Y.× Matsumoto, N.× Mitarai, O.× 新屋 貴浩 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | AC Ohmic coil operation experiments with frequencies up to 10 kHz were performed on the TST-2 spherical tokamak device, and the pre-ionization process was studied in detail. The minimum loop voltage for pre-ionization was 0.4 V, which corresponds to 0.5 V ${\rm m}^{-1}$ at the inboard limiter. Dependences of growth rate and saturation level of the process on various parameters were obtained, and they are compared with a time-dependent 0-dimensional model based on Townsend avalanche and loss along field lines. Most of the dependences are reproduced qualitatively by the model, and quantitative differences are within a factor of several. However, the external vertical field dependence of the appearance time, which is defined as the time to observe a plasma, and the isotope effect cannot be reproduced by the model. An ambipolar diffusion state which is predicted theoretically but mitigated experimentally is discussed. It was found that secondary electron emission at the limiter surfaces is a candidate mechanism to mitigate the state. | |||||
| 書誌情報 |
Nuclear Fusion 巻 58, 号 1, p. 016012, 発行日 2017-11 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/aa8fb1 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://iopscience.iop.org/article/10.1088/1741-4326/aa8fb1/meta | |||||
| 関連名称 | http://iopscience.iop.org/article/10.1088/1741-4326/aa8fb1/meta | |||||
