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Edge turbulence and flows in the presence of resonant magnetic perturbations on MAST

P Tamain, A Kirk, E Nardon, B Dudson, B Hnat, the MAST team2010年Plasma Physics and Controlled FusionIF 2.2出版社

The impact of resonant magnetic perturbations (RMPs) on the edge of MAST L-mode plasmas is studied using a mid-plane reciprocating probe equipped with a Gundestrup probe head. A strong impact on the characteristics of the ion saturation current fluctuations is observed just inside the separatrix, with a broadening of the power spectrum and an asymmetrization of the probability distribution functions towards non-Gaussian shapes. No major effect is found in the scrape-off layer (SOL). Floating potential measurements are used to evaluate the modification of the plasma potential profiles. The radial electric field profile flattens when RMPs are applied, leading to a theoretically expected increase in Er inside the separatrix and a decrease in the SOL. A consistent change is observed on the perpendicular and parallel flows which tend to increase inside the separatrix. In contrast, in the SOL, a braking of the rotation is observed with the application of RMPs. All these effects occur only above a threshold in the amplitude of the current applied in the RMP coils and are not toroidally localized.

日本語訳

MAST Lモードプラズマの周辺部における共鳴磁場摂動(RMP)の影響を、グンデストラッププローブを備えた赤道面往復プローブを用いて研究した。セパラトリクス直内側では、イオン飽和電流変動の特性に対する顕著な影響が観測され、パワースペクトルの広がりと、確率分布関数の非ガウス形状への非対称化が見られた。スクレイプオフ層(SOL)では、大きな影響は見られなかった。浮遊電位測定を用いて、プラズマ電位分布の変化を評価した。RMP印加時には動径電場分布が平坦化し、理論的に予想される通り、セパラトリクス内側ではErの増加、SOLでは減少が見られた。垂直方向および平行方向の流れにも一貫した変化が観測され、セパラトリクス内側では増加する傾向が見られた。対照的に、SOLではRMP印加に伴う回転の減速が観測された。これらの効果はすべて、RMPコイルに印加する電流の振幅がある閾値を超えた場合にのみ発生し、トロイダル方向に局在化していない。

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mast高精度(タイトル一致)

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Magnetic perturbationResonant magnetic perturbationMASTEdge turbulence
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