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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >The response of short-scale density fluctuations to the activity of beta-induced Alfven eigenmodes during strong tearing modes on EAST tokamak
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The response of short-scale density fluctuations to the activity of beta-induced Alfven eigenmodes during strong tearing modes on EAST tokamak

机译：EAST托卡马克上强撕裂模式下短尺度密度波动对β诱导的Alfven本征模式活动的响应

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摘要

Beta-induced Alfven eigenmodes (BAEs) during strong tearing modes (TMs) have been frequently observed in fast-electron plasmas of EAST tokamak. The dynamics of the short-scale (k(perpendicular to)rho(s) similar to 1.5-4.3) density fluctuations during the activity of BAEs with strong TMs has been preliminarily investigated by a tangential CO2 laser collective scattering system. The results suggest the active, but different, response of short-scale density fluctuations to the TMs and BAEs. In the low-frequency (0-10 kHz) part of density fluctuations, there are harmonic oscillations totally corresponding to those of TMs. In the medium-high frequency (10-250 kHz) part of density fluctuations, with the appearance of the BAEs, the medium-high frequency density fluctuations begin to be dominated by several quasi-coherent (QC) modes, and the frequencies of the QC modes seem to be related to the changes of both TMs and BAEs. These results would shed some light on the understanding of the multi-scale interaction physics.
机译：在EAST托卡马克的快速电子等离子体中，经常观察到强撕裂模式（TM）期间Beta诱导的Alfven本征模式（BAE）。已经通过切向CO2激光集体散射系统初步研究了在具有强TMs的BAE的活动过程中，短尺度（k（垂直于rho（s），近似于1.5-4.3）的密度）的动态变化。结果表明，短尺度密度波动对TM和BAE产生了积极但不同的响应。在密度波动的低频（0-10 kHz）部分，存在完全对应于TM的谐波振荡。在密度波动的中高频（10-250 kHz）部分中，随着BAE的出现，中高频密度波动开始由几种准相干（QC）模式控制， QC模式似乎与TM和BAE的变化有关。这些结果将为多尺度相互作用物理学的理解提供一些启示。

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