物理
湍流
托卡马克
振幅
等离子体
雷诺应力
环面
计算物理学
原子物理学
机械
量子力学
作者
Jianqiang Xu,Yaoru Qu,Jingchun Li,Zhihong Lin,J. Q. Dong,Xiaodong Peng,Min Jiang,Hongpeng Qu,Z. Huang,Na Wu,Weice Wang,G. Z. Hao,Wei Chen,Jiquan Li,Min Xu
出处
期刊:Nuclear Fusion
[IOP Publishing]
日期:2022-06-14
被引量:2
标识
DOI:10.1088/1741-4326/ac7888
摘要
Abstract Direct causality analysis of the multi-scale interactions among macro-scale tearing mode (TM), meso-scale geodesic acoustic mode (GAM) and small-scale turbulence in the edge plasma of the HL-2A tokamak utilizing transfer entropy method is reported. Experimental results have demonstrated that the (m/n)=(2/1) (with m and n being the poloidal and toroidal mode numbers, respectively) TM modulates the turbulence with the frequency range of f=50-150 kHz and the GAM mainly modulates that with higher frequencies. The TM has both amplitude and phase modulation on turbulence energy while the GAM has only amplitude regulation effect. Transfer entropy analyses have shown that both TM and GAM will modulate the turbulence energy during which the impact of the former is of about an order magnitude larger than the latter, whereas the causal effect of TM on particle transport is about twice as that of the GAM, which owes to the different causal effects on density and electric field fluctuations caused by TM and GAM, respectively. It is suggested that the magnetic fluctuation strongly modulates the Reynolds stress which serves as a mediator, leading to a cooperative interaction between TM and GAM in the edge of tokamak plasmas.
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