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Magnetic shear effect on plasma transport at Te/Ti ~ 1 through electron cyclotron heating in DIII-D plasmas
https://repo.qst.go.jp/records/82089
https://repo.qst.go.jp/records/820894c6e9871-1b2d-468f-93e5-e09b58d13701
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-03-09 | |||||
| タイトル | ||||||
| タイトル | Magnetic shear effect on plasma transport at Te/Ti ~ 1 through electron cyclotron heating in DIII-D 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 |
Maiko, Yoshida
× Maiko, Yoshida× McKee, G.R.× Petty, C.C.× Grierson, B.A.× Nakata, M.× Rost, C.× Rhodes, T.L.× Ernst, D.R.× Garofalo, A.M.× Maiko, Yoshida |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The effect of magnetic shear on plasma transport for an electron to ion temperature ratio (Te/Ti) near unity has been explored in DIII-D utilizing electron cyclotron heating (ECH). Previous reports showed that significant confinement degradation occurred at Te/Ti ~ 1 in positive shear (PS) plasmas in DIII-D, whereas reduced confinement degradation was observed in negative central shear (NCS) plasmas. In this study, plasma transport in weak magnetic shear (WS) plasmas with ECH is investigated and compared with that in NCS and PS plasmas. Here the magnetic shears ($\hat s$) are $\hat s$ > 0.5, ~0 and <-0.1 in the core region (ρ~ 0.3–0.4) of PS, WS and NCS plasmas, respectively, and flat or negative inside ρ~ 0.4 in the WS and NCS plasmas. Weak magnetic shear is found to be effective in minimizing degradation of ion thermal confinement as Te/Ti increases through ECH application, and an improved confinement factor of H98y2 ~ 1.2 is maintained, similar to NCS plasmas. At Te/Ti ~ 1, the ion thermal diffusivity around an internal transport barrier decreases when changing the magnetic shear from positive to weak or negative shear. Also, reduced local particle and momentum transport was indicated by steeper density and toroidal rotation profiles in the weak and negative shear regimes. Linear gyrokinetic simulations predict little change in growth rates of low-k turbulence with ECH application in the WS and NCS plasmas, which is consistent with the transport and profile analyses. | |||||
| 書誌情報 |
Nuclear Fusion 巻 61, 号 1, p. 016013, 発行日 2020-11 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0029-5515 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/abbfe7 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/abbfe7 | |||||
