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Structure generation of the edge radial current during the L-H transition on JT-60U
https://repo.qst.go.jp/records/76281
https://repo.qst.go.jp/records/76281b258ed4a-0d93-4c5e-bd43-abc79afc6745
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-07-16 | |||||
| タイトル | ||||||
| タイトル | Structure generation of the edge radial current during the L-H transition on JT-60U | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Kamiya, Kensaku
× Kamiya, Kensaku× Itoh, Kimitaka× Sanae-I, Itoh× Honda, Mitsuru× Kamiya, Kensaku× Honda, Mitsuru |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In this study, we analyzed the structure generation of the edge radial current (jr) by means of Poisson’s equation with a measured Er data (CXRS diagnostic) in JT-60U NBI heating plasmas [1-4]. About 200 ms after the start of NBI heating, a slow L-H transition takes place, which evolves into a fully-developed H-mode spending a few 100ms. During this slow transition process, a smooth decrease in Dα emission, increase in the edge line-averaged electron density and steepening of ion temperature take place. The Er-well bottom value at ~3 cm inside the LCFS becomes large up to -40 kV/m as a similar time-scale of the change in the density [5], while the jr shows a local Max. value of 0.01-0.02 A/m2 just after a slow L-H transition and its broader radial structure propagates toward plasma core region in the time-scale of ~100ms as seen in the pedestal development. On the other hand, we found that a localized jr structure with positive or negative polarities of its absolute peak value of 0.4-0.5 A/m2 occurred spontaneously during the later ELM-free H-phase at which a complex multi-stage Er-transition was seen with a fast time-scale. This observation suggests a co-existence of the non-linear physical mechanism for the jr generation at the plasma edge region in terms of its variation in the time-scale and radial structure. Comparison with a theoretical model, including fast-ion loss current due to the ripple loss effect, is also discussed. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 46th EPS Conference on Plasma Physics | |||||
| 発表年月日 | ||||||
| 日付 | 2019-07-12 | |||||
| 日付タイプ | Issued | |||||
