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Modelling of plasma response to 3D external magnetic field perturbations in EAST

Xu Yang, Youwen Sun, Yueqiang Liu, Shuai Gu, Yue Liu, Huihui Wang, Lina Zhou, Wenfeng Guo2016年Plasma Physics and Controlled FusionIF 2.2出版社

Sustained mitigation and/or suppression of type-I edge localized modes (ELMs) has been achieved in EAST high-confinement plasmas, utilizing the resonant magnetic perturbation (RMP) fields produced by two rows of magnetic coils located just inside the vacuum vessel. Systematic toroidal modelling of the plasma response to these RMP fields with various coil configurations (with dominant toroidal mode number n  = 1, 2, 3, 4) in EAST is, for the first time, carried out by using the MARS-F code (Liu et al 2000 Phys. Plasmas7 3681), with results reported here. In particular, the plasma response is computed with varying coil phasing (the toroidal phase difference of the coil currents) between the upper and lower rows of coils, from 0 to 360°. Four figures of merit, constructed based on the MARS-F computations, are used to determine the optimal coil phasing. The modelled results, taking into account the plasma response, agree well with the experimental observations in terms of the coil phasing for both the mitigated and the suppressed ELM cases in EAST experiments. This study provides a crucial confirmation of the role of the plasma edge peeling response in ELM control, complementing similar studies carried out for other tokamak devices.

日本語訳

EAST高閉じ込めプラズマにおいて、真空容器内側に配置された2列の磁気コイルが生成する共鳴磁場摂動(RMP)を用いることにより、エッジ局在モード(ELM)の持続的な緩和および/または抑制が達成された。EASTにおける様々なコイル配位(卓越トロイダルモード数n = 1, 2, 3, 4)に対するRMPへのプラズマ応答の系統的なトロイダルモデリングが、MARS-Fコード(Liu et al 2000 Phys. Plasmas 7 3681)を用いて初めて実施され、その結果がここで報告される。特に、上下コイル列間のコイル位相差(コイル電流のトロイダル位相差)を0°から360°まで変化させた場合のプラズマ応答が計算された。MARS-F計算に基づいて構築された4つの性能指標を用いて、最適なコイル位相差が決定された。プラズマ応答を考慮したモデリング結果は、緩和および抑制されたELMの両方のケースにおいて、コイル位相差に関する実験観測と良く一致する。本研究は、ELM制御におけるプラズマ端部ピーリング応答の役割に関する重要な確認を提供し、他のトカマク装置で実施された同様の研究を補完するものである。

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