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Hysteresis and fast timescales in transport relations of toroidal plasmas
https://repo.qst.go.jp/records/48924
https://repo.qst.go.jp/records/48924a89407b6-0fb1-4387-a3fc-ff98f6dbd069
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-05-08 | |||||
| タイトル | ||||||
| タイトル | Hysteresis and fast timescales in transport relations of toroidal plasmas | |||||
| 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 |
Itoh, K.
× Itoh, K.× Itoh, S.-I.× Ida, K.× Inagaki, S.× Kamada, Y.× Kamiya, K.× Dong, J.Q.× Hidalgo, C.× Evans, T.× Ko, W.H.× Park, H.× Tokuzawa, T.× Kubo, S.× T., Kobayashi× Kosuga, Y.× Sasaki, M.× Yun, G.S.× Song, S.D.× Kasuya, N.× Nagashima, Y.× Moon, C.× Yoshinuma, M.× Makino, R.× Tsujimura, T.× Tsuchiya, H.× Stroth, U.× 鎌田 裕× 神谷 健作 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | This article assesses current understanding of hysteresis in transport relations, and its impact on the eld. The rapid changes of uxes compared to slow changes of plasma parameters are overviewed for both core and edge plasmas. The modulation ECH experiment is explained, in which the heating power cycles on-and-off periodically, revealing hysteresis and fast changes in the gradient– ux relation. The key nding is that hystereses were observed simultaneously in both the the gradient– ux and gradient– uctuation relations. Hysteresis with rapid timescale exists in the channels of energy, electron and impurity densities, and plausibly in momentum. Advanced methods of data analysis are explained. Transport hysteresis can be studied by observing the higher harmonics of temperature perturbation δTm in heating modulation experiments. The hysteresis introduces the term δTm, which depends on the harmonic number m in an algebraic manner (not exponential decay). Next, the causes of hysteresis and its fast timescale are discussed. The nonlocal-in-space coupling works here, but does not suf ce. One mechanism for ‘the heating heats turbulence’ is that the external source S in phase space for heating has its uctuation in turbulent plasma. This coupling can induce the direct input of heating power into uctuations. The height of the jump in transport hysteresis is smaller for heavier hydrogen isotopes, and could be one of the origins of isotope effects on confinement. Finally, the impacts of transport hysteresis on the control system are assessed. Control systems must be designed so as to protect the system from sudden plasma loss. | |||||
| 書誌情報 |
Nuclear Fusion 巻 57, 号 102021, p. 1-7, 発行日 2017-07 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/aa796a/meta | |||||
