Understanding the destabilization of a resistive drift mode in EAST core plasmas
Understanding the destabilization of a resistive drift mode in EAST core plasmas
复制标题
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:
影响因子:
--
通讯作者:
L.Hu
中科院分区:
文献类型:
--
作者:
Erzhong Li;L.Xu;W.Guo;K.Chen;B.Lyu;Y.Shen;L.Hu
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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