Understanding the destabilization of a resistive drift mode in EAST core plasmas

Understanding the destabilization of a resistive drift mode in EAST core plasmas
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了解 EAST 核心等离子体中电阻漂移模式的不稳定

DOI:
10.1063/1.4976136
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发表时间:
2017-02
期刊:
Phys. Plasmas
影响因子:
--
通讯作者:
L.Hu
L.Hu
中科院分区:
其他
文献类型:
--
作者:
Erzhong Li;L.Xu;W.Guo;K.Chen;B.Lyu;Y.Shen;L.Hu

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在实验先进超导托卡马克(EAST)H模放电中,经常观察到由重杂质驱动的低频振荡,并伴有边缘局域无模持续时间。根据双流体模拟,这种不稳定性被确定为电阻漂移模式,表明模式稳定性由电阻率剖面的梯度决定。此外,分析理论还表明,该模式是不稳定的尖锐的杂质浓度梯度同意本征钼(钼)浓度的观察。导出了不稳定条件LN,z<23LT,z(LN,z和LT,z分别为杂质密度和温度的标度长度)。基于解析理论的计算再现了该模式的特征,这与实验观察相一致。
A low-frequency oscillation driven by heavy impurities is frequently observed in the Experimental Advanced Superconducting Tokamak (EAST) H-mode discharges accompanied by an Edge Localized Mode-free duration. This instability has been identified as a resistive drift mode according to a two-fluid simulation, showing that the mode stability is determined by the gradient of resistivity profile. Furthermore, the analytic theory also demonstrates that the mode is destabilized by the sharp impurity density gradient agreeing to the observation of intrinsic Mo (Molybdenum) concentration. The destabilization conditions have been derived like LN,z<23LT,z ( LN,z and LT,z are the scale lengths of density and temperature of impurity, respectively). Calculations based on the analytical theory reproduce the characteristic of the mode, which is in agreement with the experimental observations.
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