Predicting PDF tails of flux in plasma sheath region

Predicting PDF tails of flux in plasma sheath region
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预测等离子体鞘层区域通量的 PDF 尾部

DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
Eun
Eun
中科院分区:
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文献类型:
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作者:
Johan Anderson;Eun

文献摘要

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这封信首次预测了磁聚变装置中等离子体鞘层区域通量 R 的概率密度函数 (PDF),其特征是具有指数非线性的动力学方程。通过使用非微扰统计理论(瞬时),一阶矩的PDF尾部被证明是修正的Gumbel分布,它代表了系综极值的频率分布。可能比高斯预测增强的非高斯 PDF 尾部是由短寿命相干结构(瞬时)引起的间歇性的结果。
This letter provides the first prediction of the probability density function (PDF) of flux R in plasma sheath region in magnetic fusion devices which is characterized by dynamical equations with exponential non-linearities. By using a non-perturbative statistical theory (instantons), the PDF tails of first moment are shown to be a modified Gumbel distribution which represents a frequency distribution of the extreme values of the ensemble. The non-Gaussian PDF tails that may be enhanced over Gaussian predictions are the result of intermittency caused by short lived coherent structures (instantons).