Evidence of Lévy stable process in tokamak edge turbulence
Evidence of Lévy stable process in tokamak edge turbulence
复制标题
托卡马克边缘湍流中 Lévy 稳定过程的证据
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Aditya Team
中科院分区：
文献类型：
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作者：
R. Jha;P. Kaw;D. R. Kulkarni;J. C. Parikh;Aditya Team
欧姆加热 ADITYA 托卡马克边缘等离子体中浮动电势和极向电场波动的时间序列 [Phys. Plasmas 4, 4292 (1997)] 进行自相似性分析。观察到n个数据点之和的分布函数收敛于Levy尺度指数的自相似分布，对于n≤40，α=1.1-1.3，对于较大n，α=1.8-2.0。这表明小尺度波动的尺度特性是非高斯的，而大尺度波动的尺度特性是高斯的。讨论了这一观察结果对我们理解血浆运输的影响。
The time series of floating potential and poloidal electric field fluctuations in the edge plasma of ohmically heated ADITYA tokamak [Phys. Plasmas 4, 4292 (1997)] are analyzed for self-similarity. It is observed that the distribution function of a sum of n data points converges to a self-similar distribution of Levy scale index, α=1.1–1.3 for n⩽40 and α=1.8–2.0 for larger n. This shows that the scaling properties of small scale fluctuations are non-Gaussian and those of large scale fluctuations are Gaussian. Implication of this observation to our understanding of plasma transport is discussed.