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Effects of plasma shear flow on the RWM stability in ITER

Chao Liu, Yueqiang Liu, Yue Liu, Guangzhou Hao, Li Li, Zhirui Wang2015年被引用 14Nuclear FusionIF 3出版社

Rotational stabilization of the resistive wall mode (RWM), with varying E × B flow shear and the radial location of peak shear, is systematically investigated using the MARS-K code (Liu et al 2008 Phys. Plasmas15 112503), following a non-perturbative magnetohydrodynamic–kinetic hybrid approach. The equilibrium is based on a 9 MA steady state target plasma from the ITER design, except for the plasma flow profile, which is significantly varied in this study. Generally two branches of unstable n = 1 kinetic RWMs are computed (n is the toroidal mode number), depending on the flow amplitude. The first unstable branch, which is normally the more unstable one, is sensitively affected by both the local flow shear as well as the radial location of the peak amplitude of the shear. On the contrary, the second unstable branch, which is often weakly unstable, is less affected by the flow shear. Consequently, stability domains are computationally mapped out in relevant two-dimensional parameter spaces.

日本語訳

抵抗性壁モード(RWM)の回転安定化について、E × Bフローシアーとピークシアーの半径方向位置を変化させながら、MARS-Kコード(Liu et al 2008 Phys. Plasmas15 112503)を用いて、非摂動的磁気流体力学・運動論的ハイブリッド手法に従って系統的に調査した。平衡は、ITER設計からの9 MA定常状態ターゲットプラズマに基づいているが、プラズマフロープロファイルは本研究で大幅に変化させている。一般に、不安定なn = 1運動論的RWMの2つの分枝が、フロー振幅に依存して計算される(nはトロイダルモード数である)。通常より不安定な方である第一の不安定分枝は、局所フローシアーとシアーのピーク振幅の半径方向位置の両方に敏感に影響される。対照的に、しばしば弱く不安定な第二の不安定分枝は、フローシアーの影響をあまり受けない。その結果、安定性領域が関連する二次元パラメータ空間において計算的にマッピングされた。

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