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Effects of resonant magnetic perturbations on turbulence and transport in DIII-D L-mode plasmas

S Mordijck, T L Rhodes, L Zeng, E J Doyle, L Schmitz, C Chrystal, T J Strait, R A Moyer2016年Plasma Physics and Controlled FusionIF 2.2出版社

In this paper we show that resonant magnetic perturbations (RMPs) affect the L- to H-mode power threshold. We find that during the L-mode phase, RMPs cause the particle pinch to reverse from traditionally inward to outward. As a result, the density at the plasma edge increases, while the density in the plasma core is reduced. Linear stability calculations indicate that the plasma transitions from an ion temperature gradient (ITG) to trapped electron mode (TEM) regime at the plasma edge. If the applied RMP current is below the threshold for penetration and island formation, we find that the changes in the edge radial electric field are minimal, while the carbon toroidal rotation brakes over the whole minor radius. Once the RMP field penetrates and the screening plasma response dissappears, the spin-up of the toroidal rotation at the plasma edge results in a positive radial electric field inside the separatrix.

日本語訳

本論文では、共鳴磁場摂動(RMP)がLモードからHモードへの遷移パワー閾値に影響を与えることを示す。Lモード相の間、RMPが粒子ピンチを従来の内向きから外向きへと反転させることがわかった。その結果、プラズマ周辺部の密度は増加する一方、プラズマコアの密度は減少する。線形安定性計算により、プラズマ周辺部においてイオン温度勾配(ITG)から捕捉電子モード(TEM)領域への遷移が生じることが示される。印加RMP電流が磁場の浸透および磁気島形成の閾値未満である場合、周辺部の径方向電場の変化は最小限である一方、炭素トロイダル回転はプラズマ小半径全体にわたって減速することがわかった。RMP磁場が浸透し、遮蔽プラズマ応答が消滅すると、プラズマ周辺部におけるトロイダル回転のスピンアップにより、セパラトリックス内側に正の径方向電場が生じる。

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diii-d高精度(タイトル一致)

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DIII-DMagnetic perturbationResonant magnetic perturbationL-mode
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