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Overview of the ICRF antenna coupling experiments on EAST

H. Yang, X.J. Zhang, C.M. Qin, Y.P. Zhao, S. Yuan, Y.Z. Mao, X. Yang, M.H. Li, G. Urbanczyk, M. Wang2021年被引用 11Nuclear FusionIF 3出版社

Experimental verification of ion cyclotron range of frequencies (ICRF) wave coupling is crucial to gain insight into the physics of the improvement of ICRF antenna coupling. The progress of ICRF antenna coupling experiments on EAST has been reported since 2007. The dependence of the loading resistance on the target plasma parameters, operational regimes and synergic heating scenarios on EAST are reviewed. Results show that the antenna coupling resistance Rc in L-mode regime meets the relation of Rc ∝ exp(−1.5k∥xc), which is in good agreement with the simulation results with a perfectly matched layer method, where k∥ is the dominant launched parallel wave number and xc is the distance of the ICRF antenna and fast wave cut-off layer. Low plasma current, gas puff in the magnetic connections with the ICRF antenna and lower hybrid wave/electron cyclotron heating are beneficial for improving ICRF antenna coupling. The antenna coupling has a strong response during large edge-localized modes (ELMs) but it becomes steady state during ELM free. The study of ICRF antenna coupling under various parameters is helpful to optimize the ICRF wave heating scenario and understand the physical mechanisms which influence the ICRF wave coupling in plasmas.

日本語訳

イオンサイクロトロン周波数帯域(ICRF)波動結合の実験的検証は、ICRFアンテナ結合の改善の物理的理解を得るために極めて重要である。EASTにおけるICRFアンテナ結合実験の進展は2007年以降報告されている。EASTにおける負荷抵抗のターゲットプラズマパラメータ、運転領域、および協同加熱シナリオへの依存性を概説する。結果は、Lモード領域におけるアンテナ結合抵抗RcがRc ∝ exp(−1.5k∥xc)の関係を満たすことを示しており、これは完全整合層法によるシミュレーション結果と良好に一致する。ここで、k∥は主要な励起平行波数であり、xcはICRFアンテナと高速波遮断層の間の距離である。低プラズマ電流、ICRFアンテナとの磁気結合におけるガス入射、および低混成波/電子サイクロトロン加熱は、ICRFアンテナ結合の改善に有益である。アンテナ結合は大きな周辺局在モード(ELM)中に強い応答を示すが、ELMフリー時には定常状態となる。様々なパラメータ下でのICRFアンテナ結合の研究は、ICRF波動加熱シナリオの最適化と、プラズマ中のICRF波動結合に影響を与える物理メカニズムの理解に役立つ。

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east高精度(タイトル一致)

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EASTIon cyclotron heatingIon cyclotron antenna
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