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Effect of MHD on edge electrostatic fluctuation with lower hybrid current drive in the HT-7 tokamak

机译：MH-7托卡马克中较低混合电流驱动下MHD对边缘静电波动的影响

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摘要

The close correlation between the edge electrostatic fluctuations around the last closed flux surface and the magnetohydrodynamic (MHD) activity in the case of lower hybrid current drive (LHCD) is observed and analysed in the HT-7 tokamak. The turbulent transport is primarily driven by a coherent MHD mode, indicating that the electrostatic fluctuations are strongly correlated with MHD activity. The results supply direct evidence that the edge electrostatic fluctuations in tokamak plasmas can be decreased by suppressing internal tearing mode activity and thus reduce the radial plasma transport. The coherent electrostatic fluctuations may be possibly attributable to the radial plasma transport accompanied by the internal tearing mode activity. Studies show that the smaller electrostatic fluctuations at a frequency of 10 kHz may be mainly ascribed to the suppressed MHD activity, possibly due to the fort-nation of an internal transport barrier and flow shear in the edge region. It is speculated that the change of mode region resulting from the mode coupling/transform, excited by the modified current profile by LHCD, could also provide some contribution to the MHD reduction.
机译：在HT-7托卡马克中，观察并分析了在较低的混合电流驱动（LHCD）情况下，最后一个封闭通量表面周围的边缘静电波动与磁流体动力学（MHD）活性之间的紧密相关性。湍流传输主要由相干的MHD模式驱动，这表明静电涨落与MHD活动密切相关。结果提供了直接的证据，可以通过抑制内部撕裂模式的活动来减少托卡马克等离子体的边缘静电波动，从而减少径向等离子体的传输。相干的静电波动可能归因于径向等离子体传输以及内部撕裂模式活动。研究表明，在10 kHz的频率上较小的静电波动可能主要归因于MHD活性的抑制，这可能是由于内部传输屏障的加强和边缘区域的流动剪切所致。据推测，由模式耦合/变换引起的模式区域的变化，由LHCD修改后的电流分布图激发，也可以为MHD的降低做出贡献。

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