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A comparative study of ideal kink stability in two reactor-relevant tokamak plasma configurations with negative and positive triangularity

Jing Ren, Yueqiang Liu, Yue Liu, S Yu Medvedev, Zhirui Wang, Guoliang Xia2016年Plasma Physics and Controlled FusionIF 2.2出版社

The effects of an ideal/resistive conducting wall, the drift kinetic resonances, as well as the toroidal plasma flow, on the stability of the ideal external kink mode are numerically investigated for a reactor-relevant tokamak plasma with strongly negative triangularity (NTR) shaping. Comparison is made for a similar plasma equilibrium, but with positive triangularity (PTR). It is found that the ideal wall stabilization is less efficient for the kink stabilization in the NTR plasma due to a less 'external' eigenmode structure compared to the PTR plasma. The associated plasma displacement in the NTR plasma does not 'balloon' near the outboard mid-plane, as is normally the case for the pressure-driven kink-ballooning instability in PTR plasmas, but being more pronounced near the X-points. The toroidal flow plays a similar role for the kink stability for both NTR and PTR plasmas. The drift kinetic damping is less efficient for the ideal external kink mode in the NTR plasma, despite a somewhat larger fraction of the particle trapping near the plasma edge compared to the PTR equilibrium. However, the drift kinetic damping of the resistive wall mode (RWM) in the NTR plasma is generally as efficient as that of the PTR plasma, although the RWM window, in terms of the normalized pressure, is narrower for the NTR plasma.

日本語訳

理想的な導体壁および抵抗性導体壁の効果、ドリフト運動論的共鳴、ならびにトロイダルプラズマ流が、強く負の三角形度(NTR)を有する炉心関連トカマクプラズマにおける理想外部キンクモードの安定性に及ぼす影響を数値的に調査した。同様のプラズマ平衡であるが正の三角形度(PTR)を有する場合との比較を行った。NTRプラズマにおけるキンク安定化に対する理想的な導体壁の効果は、PTRプラズマと比較して、より「外部」的でない固有モード構造に起因して、その安定化効率が低いことが見出された。NTRプラズマにおける関連するプラズマ変位は、PTRプラズマにおける圧力駆動キンク・バルーニング不安定性で通常見られるように外側中平面付近で「バルーニング」せず、むしろX点付近でより顕著となる。トロイダルプラズマ流は、NTRおよびPTRの両プラズマにおいてキンク安定性に対して同様の役割を果たす。NTRプラズマにおける理想外部キンクモードに対するドリフト運動論的減衰は、PTR平衡と比較して粒子捕捉割合がやや大きいにもかかわらず、その減衰効率は低い。しかしながら、NTRプラズマにおける抵抗性壁モード(RWM)のドリフト運動論的減衰は、規格化圧力に関するRWM安定性ウィンドウがNTRプラズマではより狭いものの、概ねPTRプラズマと同程度の効率を示す。

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