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On plasma rotation with toroidal magnetic field ripple and no external momentum input

C. Fenzi, X. Garbet, E. Trier, P. Hennequin, C. Bourdelle, T. Aniel, G. Colledani, P. Devynck, C. Gil, Ö. Gürcan2011年被引用 27Nuclear FusionIF 3出版社

Ripple-induced thermal loss effect on plasma rotation is investigated in a set of Ohmic L-mode plasmas performed in Tore Supra, and comparisons with neoclassical predictions including ripple are performed. Adjusting the size of the plasma, the ripple amplitude has been varied from 0.5% to 5.5% at the plasma boundary, keeping the edge safety factor constant. The toroidal flow dynamics is understood as being likely dominated by turbulence transport driven processes at low ripple amplitude, while the ripple-induced toroidal friction becomes dominant at high ripple. In the latter case, the velocity tends remarkably towards the neoclassical prediction (counter-current rotation). The radial electric field is not affected by the ripple variation and remains well described by its neoclassical prediction. Finally, the poloidal velocity is of the order of the neoclassical prediction at high ripple amplitude, but significantly departs from it at low ripple.

日本語訳

リップル誘起熱損失効果がプラズマ回転に及ぼす影響が、Tore Supraで実施された一連のオーミックLモードプラズマにおいて調査され、リップルを含む新古典的予測との比較が行われた。プラズマのサイズを調整することで、周辺安全係数を一定に保ちつつ、リップル振幅はプラズマ境界で0.5%から5.5%まで変化させられた。トロイダル流のダイナミクスは、低リップル振幅では乱流輸送駆動過程によって支配されている可能性が高いと理解され、一方、高リップルではリップル誘起トロイダル摩擦力が支配的になる。後者の場合、速度は新古典的予測(反電流方向回転)へと顕著に近づく傾向を示す。径電場はリップル変化の影響を受けず、新古典的予測によってよく記述されたままである。最後に、ポロイダル速度は高リップル振幅では新古典的予測のオーダーであるが、低リップルではそこから有意に逸脱する。

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