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Stabilization of resistive wall modes in tokamaks by drift kinetic effects combined with magnetic feedback

Guoliang Xia, Yueqiang Liu, Yue Liu, G.Z. Hao, Li Li2015年被引用 20Nuclear FusionIF 3出版社

The synergetic effects of drift kinetic resonances, the resistive layer dissipation, the magnetic feedback, and the toroidal plasma flow on the stability of the resistive wall mode are numerically investigated using a full toroidal resistive magnetohydrodynamic-kinetic hybrid stability code MARS-K (Liu et al 2008 Phys. Plasmas15 112503). It is found that the plasma resistivity, coupled with the favourable average curvature effect, can enlarge the stable domain predicted by the drift kinetic model. A synergy between the precessional drift resonance damping, the magnetic feedback and the plasma flow helps open two stability windows. The width of the inner stability window increases with the feedback gain, but decreases with the flow speed. In addition, optimization of the toroidal phase difference of the feedback gains between the upper and lower active coils can lead to a full suppression of the mode.

日本語訳

ドリフト運動論的共鳴、抵抗性層散逸、磁気フィードバック、およびトロイダルプラズマ流が抵抗性壁モードの安定性に及ぼす相乗効果を、完全トロイダル抵抗性磁気流体力学-運動論的ハイブリッド安定性コードMARS-K(Liuら 2008 Phys. Plasmas15 112503)を用いて数値的に調査した。プラズマ抵抗率は、好ましい平均曲率効果と結合することで、ドリフト運動論的モデルによって予測される安定領域を拡大できることが見出された。歳差ドリフト共鳴減衰、磁気フィードバック、およびプラズマ流の間の相乗効果は、二つの安定性ウィンドウを開くのに役立つ。内部安定性ウィンドウの幅はフィードバック利得とともに増加するが、流速とともに減少する。さらに、上部および下部の能動コイル間のフィードバック利得のトロイダル位相差を最適化することで、モードの完全抑制が可能となる。

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Resistive wall mode
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