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Investigation of impurity confinement in lower hybrid wave heated plasma on EAST tokamak

Z. Xu, Z.W. Wu, L. Zhang, W. Gao, Y. Ye, K.Y. Chen, Y. Yuan, W. Zhang, X.D. Yang, Y.J. Chen2018年被引用 10Nuclear FusionIF 3出版社

The transient perturbation method with metallic impurities such as iron (Fe, Z  =  26) and copper (Cu, Z  =  29) induced in plasma-material interaction (PMI) procedure is used to investigate the impurity confinement characters in lower hybrid wave (LHW) heated EAST sawtooth-free plasma. The dependence of metallic impurities confinement time on plasma parameters (e.g. plasma current, toroidal magnetic field, electron density and heating power) are investigated in ohmic and LHW heated plasma. It is shown that LHW heating plays an important role in the reduction of the impurity confinement time in L-mode discharges on EAST. The impurity confinement time scaling is given as on EAST, which is close to the observed scaling on Tore Supra and JET. Furthermore, the LHW heated high-enhanced-recycling (HER) H-mode discharges with ~25 kHz edge coherent modes (ECM), which have lower impurity confinement time and higher energy confinement time, provide promising candidates for high performance and steady state operation on EAST.

日本語訳

プラズマ・材料相互作用(PMI)過程で誘起された鉄(Fe, Z = 26)や銅(Cu, Z = 29)などの金属不純物を用いた過渡摂動法は、低混成波(LHW)加熱されたEAST鋸歯状振動のないプラズマにおける不純物閉じ込め特性を調査するために使用される。金属不純物の閉じ込め時間のプラズマパラメータ(例えば、プラズマ電流、トロイダル磁場、電子密度、加熱電力)への依存性は、オーミックおよびLHW加熱プラズマにおいて調査される。LHW加熱がEASTのLモード放電における不純物閉じ込め時間の低減に重要な役割を果たすことが示されている。不純物閉じ込め時間のスケーリング則はEASTにおいて与えられ、それはTore SupraおよびJETで観測されたスケーリング則に近い。さらに、~25 kHzの周辺コヒーレントモード(ECM)を伴うLHW加熱された高増強リサイクリング(HER)Hモード放電は、より低い不純物閉じ込め時間とより高いエネルギー閉じ込め時間を有し、EASTにおける高性能かつ定常運転の有望な候補を提供する。

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east高精度(タイトル一致)jet中精度(概要文一致)

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EASTImpurityLower hybrid
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