EXPERIMENTAL EVIDENCE OF THE SELF-SIMILARITY AND LONG-RANGE CORRELATIONS OF THE EDGE FLUCTUATIONS IN HT-6M TOKAMAK
Wang Wen-hao (王文浩)a, Yu Chang-xuan (俞昌旋)a, Wen Yi-zhi (闻一之)a, Xu Yu-hong (许宇鸿)b, Ling Bi-li (凌必利)b, Gong Xian-zu (龚先祖)b, Liu Bao-hua (刘保华)b, Wan Bao-nian (万宝年)b
a Department of Modern Physics, University of Science and Technology of China, Hefei 230027, China; b Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract To better understand long-time-scale transport dynamics, the rescaled range analysis techniques, the autocorrelation function (ACF) and the probability distribution function (PDF) are used to investigate long-range dependences in edge plasma fluctuations in HT-6M tokamak. The results reveal the self-similar characters of the electrostatic fluctuations with self-similarity parameters (Hurst exponent) ranging from 0.64 to 0.79, taking into consideration the $\vec{E}_{\text{r}}\times\vec{B}$ rotation-sheared effect. Fluctuation ACFs of both the ion saturation current and the floating potential, as well as PDF of the turbulence-induced particle flux, have two distinct time scales. One corresponds to the decorrelation time scale of local fluctuations (μs) and the other lasts to the order of the confinement time (ms). All these experimental results suggest that some of the mechanisms of the underlying turbulence are consistent with plasma transport as characterized by self-organized criticality(SOC).
Received: 03 August 2000
Revised: 12 September 2000
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 19675036 and 19635020).
Cite this article:
Wang Wen-hao (王文浩), Yu Chang-xuan (俞昌旋), Wen Yi-zhi (闻一之), Xu Yu-hong (许宇鸿), Ling Bi-li (凌必利), Gong Xian-zu (龚先祖), Liu Bao-hua (刘保华), Wan Bao-nian (万宝年) EXPERIMENTAL EVIDENCE OF THE SELF-SIMILARITY AND LONG-RANGE CORRELATIONS OF THE EDGE FLUCTUATIONS IN HT-6M TOKAMAK 2001 Chinese Physics 10 139
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