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Synergetic effects of magnetic feedback and plasma flow on resistive wall mode stability in tokamaks

Guoliang Xia, Yue Liu, Yueqiang Liu2014年Plasma Physics and Controlled FusionIF 2.2出版社

The synergetic effects of feedback and toroidal plasma rotation on the stability of the resistive wall mode are systematically investigated by a full toroidal magnetohydrodynamic stability code MARS-F (Liu Y Q et al 2000 Phys. Plasmas7 3681). This synergy is studied for both resistive and ideal plasma models. It is found that a magnetic feedback scheme, combined with the passive stabilization from the plasma flow, can open two stability windows as the resistive wall moves away from the plasma, as opposed to the single stability window opened by the plasma flow alone. The width of the new stability window increases with the feedback gain. The plasma rotation frequency affects both stability windows. The synergy is achieved when the feedback pushes the mode rotating in the same direction as the plasma flow. The plasma resistivity significantly enlarges the stable domain in this synergetic scheme, compared to that predicted by the ideal plasma model.

日本語訳

抵抗性壁モードの安定性に対するフィードバックとトロイダルプラズマ回転の相乗効果を、完全トロイダル磁気流体力学安定性コードMARS-F(Liu Y Qら、2000年、Phys. Plasmas 7、3681)を用いて系統的に調査した。この相乗効果は、抵抗性プラズマモデルと理想プラズマモデルの両方について研究された。プラズマ流による受動的安定化と組み合わせた磁気フィードバック方式により、プラズマ流のみの場合に開かれる単一の安定窓とは対照的に、抵抗性壁がプラズマから離れるにつれて2つの安定窓が開かれることが見出された。新しい安定窓の幅はフィードバックゲインとともに増大する。プラズマ回転周波数は両方の安定窓に影響を及ぼす。フィードバックがプラズマ流と同じ方向に回転するモードを押し込む場合に相乗効果が達成される。この相乗効果的な方式では、理想プラズマモデルによって予測されるものと比較して、プラズマ抵抗率が安定領域を大幅に拡大する。

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Plasma flowResistive wall mode
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