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Influence of up-down asymmetry in plasma shape on RMP response

Yueqiang Liu, B C Lyons, Shuai Gu, A Kirk, Li Li, C Paz-Soldan, M W Shafer, A D Turnbull2021年Plasma Physics and Controlled FusionIF 2.2出版社

Shaping effect on the plasma response to the externally applied resonant magnetic perturbation field is investigated for both DIII-D and MAST experiments, utilizing toroidal modeling. The plasma boundary shape is systematically varied ranging from single-null (SN) to double-null (DN) configurations, while other equilibrium quantities are kept largely unchanged. The relative amplitude of the computed plasma surface displacement, between the top/bottom of the torus and the outboard mid-plane, is identified as the most reliable indicator that distinguishes the plasma response between the SN and DN configurations. The underlying physics is the weakening of the edge-peeling component in the plasma response with increasing up-down symmetry of the plasma boundary shape.

日本語訳

外部から印加された共鳴磁場摂動に対するプラズマ応答に及ぼす形状効果について、DIII-DおよびMASTの両実験において、トロイダルモデリングを用いて調査した。プラズマ境界形状は、シングルヌル(SN)からダブルヌル(DN)配位まで系統的に変化させ、その他の平衡量はほぼ一定に保った。計算されたプラズマ表面変位の相対振幅は、トーラスの上部/下部と外側中平面との間で、SN配位とDN配位のプラズマ応答を区別する最も信頼性の高い指標であることが特定された。その背後にある物理は、プラズマ境界形状の上下対称性が増すにつれて、プラズマ応答におけるエッジ剥離成分が弱まることである。

装置

diii-d中精度(概要文一致)mast中精度(概要文一致)

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Resonant magnetic perturbation
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