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Edge localized mode control using n  =  1 resonant magnetic perturbation in the EAST tokamak

Y. Sun, M. Jia, Q. Zang, L. Wang, Y. Liang, Y.Q. Liu, X. Yang, W. Guo, S. Gu, Y. Li2017年被引用 64Nuclear FusionIF 3出版社

A set of in-vessel resonant magnetic perturbation (RMP) coil has been recently installed in EAST. It can generate a range of spectrum, and there is a relatively large window for edge localized mode (ELM) control according to the vacuum field modeling of the edge magnetic island overlapping area. Observation of mitigation and suppression of ELM in slow rotating plasmas during the application of an n  =  1 RMP is presented in this paper. Strong ELM mitigation effect is observed in neutral beam injection heating plasmas. The ELM frequency increases by a factor of 5, and the crash amplitude and the particle flux are effectively reduced by a similar factor. Clear density pump-out and magnetic braking effects are observed during the application of RMP. Footprint splitting is observed during ELM mitigation and agrees well with vacuum field modelling. Strong ELM mitigation happens after a second sudden drop of plasma density, which indicates the possible effect due to field penetration of the resonant harmonics near the pedestal top, where the electron perpendicular rotation becomes flat and close to zero after the application of RMP. ELM suppression is achieved in a resonant window during the scan of the n  =  1 RMP spectrum in radio-frequency (RF) dominant heating plasmas. The best spectrum for ELM suppression is consistent with the resonant peak of RMP by taking into account of linear magnetohydrodynamics plasma response. There is no mode locking during the application of n  =  1 RMP in ELMy H-mode plasmas, although the maximal coil current is applied.

日本語訳

最近、EASTに一組の真空容器内共鳴磁場摂動(RMP)コイルが設置された。それはスペクトルの範囲を生成でき、周辺磁気島の重なり領域の真空磁場モデリングによれば、周辺局在モード(ELM)制御のための比較的大きなウィンドウが存在する。本論文では、n = 1 RMPの印加中における低速回転プラズマ中のELMの緩和と抑制の観測を示す。強いELM緩和効果が、中性粒子ビーム入射加熱プラズマにおいて観測された。ELM周波数は5倍に増加し、クラッシュ振幅と粒子束は同様の係数で効果的に低減される。RMPの印加中に、明確な密度ポンプアウトと磁気制動効果が観測された。ELM緩和中にフットプリント分裂が観測され、真空磁場モデリングとよく一致する。強いELM緩和は、プラズマ密度の2回目の急激な低下後に発生し、これは、RMP印加後に電子の垂直回転が平坦になりゼロに近くなるペデスタル上部近傍での共鳴高調波の磁場浸透による可能性のある効果を示している。高周波(RF)主体加熱プラズマにおけるn = 1 RMPスペクトルの走査中に、共鳴ウィンドウ内でELM抑制が達成された。ELM抑制に最適なスペクトルは、線形磁気流体力学プラズマ応答を考慮に入れると、RMPの共鳴ピークと一致する。最大コイル電流が印加されているにもかかわらず、ELMy Hモードプラズマにおけるn = 1 RMPの印加中にモードロックは発生しない。

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east高精度(タイトル一致)

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EASTEdge localized modeMagnetic perturbationResonant magnetic perturbation
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