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Kinetic damping of resistive wall mode in reversed field pinch

Z.R. Wang, S.C. Guo, Y.Q. Liu, M.S. Chu2012年被引用 19Nuclear FusionIF 3出版社

The kinetic effects of thermal particles on the resistive wall mode (RWM) are studied in reversed field pinch (RFP) by adopting the toroidal hybrid stability code MARS-K (Liu et al 2008 Phys. Plasmas15 112503) where the drift kinetic effects are included self-consistently. It is found that the transit ion resonance can provide ion acoustic Landau damping to stabilize the RWMs in high-beta plasmas. The trapped particles do not play a significant role in kinetic stabilization. The required critical flow rotation frequency is in the ion acoustic range which is much smaller than that predicted previously by fluid theory (Guo et al 1999 Phys. Plasmas6 3868). The most unstable mode, having its rational surface closest to the plasma, can be stabilized for the wall near the plasma (e.g. n = 6 mode in RFX-mod) with the flow rotation in a few per cent of the Alfvén frequency. For other RWMs with different toroidal wave numbers n the stabilization conditions depend on the wall position and plasma βp. An analysis based on the potential energy components is carried out for physical understanding. The preliminary study on the effects of collisionality is also presented.

日本語訳

逆転磁場ピンチ(RFP)における抵抗性壁モード(RWM)に対する熱粒子の運動論的効果を、ドリフト運動論的効果を自己無撞着に含むトロイダルハイブリッド安定性コードMARS-K(Liu et al 2008 Phys. Plasmas15 112503)を用いて研究した。高ベータプラズマにおいて、通過イオン共鳴がイオン音響ランダウ減衰を提供し、RWMを安定化できることが見出された。捕捉粒子は運動論的安定化において重要な役割を果たさない。必要な臨界フロー回転周波数はイオン音響領域にあり、流体理論によって以前予測された値(Guo et al 1999 Phys. Plasmas6 3868)よりもはるかに小さい。最も不安定なモード、すなわちその有理面がプラズマに最も近いモードは、壁がプラズマに近い場合(例えばRFX-modにおけるn=6モード)、アルフヴェン周波数の数パーセントのフロー回転で安定化できる。異なるトロイダル波数nを持つ他のRWMについては、安定化条件は壁位置とプラズマβpに依存する。物理的理解のために、ポテンシャルエネルギー成分に基づく解析を行う。衝突性の影響に関する予備的研究も提示する。

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Reversed field pinchResistive wall mode
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