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Turbulence analysis of an experimental flux-rope plasma

机译:实验通量等离子体的湍流分析

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We have previously generated elongated Taylor double-helix flux-rope plasmas in the SSX MHD wind tunnel. These plasmas are remarkable in their rapid relaxation (about one Alfvén time) and their description by simple analytical Taylor force-free theory despite their high plasma β and high internal flow speeds. We report on the turbulent features observed in these plasmas including frequency spectra, autocorrelation function, and probability distribution functions of increments. We discuss here the possibility that the turbulence facilitating access to the final state supports coherent structures and intermittency revealed by non-Gaussian signatures in the statistics. Comparisons to a Hall-MHD simulation of the SSX MHD wind tunnel show similarity in several statistical measures.
机译:我们以前在SSX MHD风洞中产生了细长的泰勒双螺旋通量等离子体。这些等离子体的快速弛豫(大约一个Alfvén时间)和通过简单的泰勒无力解析理论对其进行描述,尽管它们具有较高的等离子体β和较高的内部流动速度,但它们均具有卓越的表现。我们报告了在这些等离子体中观察到的湍流特征,包括频谱,自相关函数和增量的概率分布函数。我们在这里讨论湍流促进进入最终状态的可能性支持统计中非高斯签名揭示的连贯结构和间歇性的可能性。与SSX MHD风洞的Hall-MHD仿真的比较显示出几种统计量的相似性。

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