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Reduction of ion thermal transport due to non-uniformity effects of the radial electric field at the edge of the JT-60U tokamak
https://repo.qst.go.jp/records/48876
https://repo.qst.go.jp/records/4887676cf4005-9f80-49ff-bcd9-dd1972c1aa06
| 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 | Reduction of ion thermal transport due to non-uniformity effects of the radial electric field at the edge of the JT-60U 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 |
神谷, 健作
× 神谷, 健作× 伊藤, 公孝× 伊藤, 早苗× 神谷 健作 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Non-uniformity effects of the edge radial electric field, Er, on the edge transport barriers (ETBs) formation have been identified with high-spatiotemporal resolution spectroscopic measurement. We found the decisive importance of Er-curvature (i.e. 2nd derivative of Er) on the ETBs formation at which the normalized ion temperature gradient, L_(T_i)^(-1)≡-(∇T_i)⁄T_i , has a local peak value in the pedestal region. On the other hand, the role of the Er-shear (i.e. 1st derivative of Er) was newly understood as for the expansion of pedestal width, compensating an unfavorable effect of the Er-curvature having its sign dependence on the transport reduction/enhancement, being expected by a theoretical model as L_(T_i)^(-1)∝(〖E_r^' E_r^'-E〗_r E_r^" )^0.5. A significant reduction of the inferred ion thermal transport coefficient in the pedestal region, χ_(i,ped.), due to the non-uniformity effects of Er was also confirmed quantitatively in the H-mode plasma at the initial ELM-free phase. When the inhomogeneity of radial electric field became strong enough, the inferred χ_(i,ped.) value was close to its neoclassical one at the later ELM-free H-phase until 1st type-I ELM onset. Even though, we observed the further reduction of electron density fluctuations (in the range up to 300 kHz) and D_α signals in association with the increment of electric field inhomogeneity. These suggest that the electron turbulent transport is suppressed further. | |||||
| 書誌情報 |
Nuclear Fusion 巻 57, 号 12, p. 126003-1-126003-7, 発行日 2018-05 |
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| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/aa7f3b | |||||
