中国物理B ›› 2001, Vol. 10 ›› Issue (2): 139-144.doi: 10.1088/1009-1963/10/2/311

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EXPERIMENTAL EVIDENCE OF THE SELF-SIMILARITY AND LONG-RANGE CORRELATIONS OF THE EDGE FLUCTUATIONS IN HT-6M TOKAMAK

王文浩1, 俞昌旋1, 闻一之1, 许宇鸿2, 凌必利2, 龚先祖2, 刘保华2, 万宝年2   

  1. (1)Department of Modern Physics, University of Science and Technology of China, Hefei 230027, China; (2)Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2000-08-03 修回日期:2000-09-12 出版日期:2001-02-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 19675036 and 19635020).

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   

  1. 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
  • Received:2000-08-03 Revised:2000-09-12 Online:2001-02-15 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 19675036 and 19635020).

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摘要： 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}r×{\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).

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).

Key words: self-similarity, long-range correlation, SOC

中图分类号:  (Plasma-material interactions; boundary layer effects)

  • 52.40.Hf
52.25.Gj (Fluctuation and chaos phenomena) 52.55.Fa (Tokamaks, spherical tokamaks) 52.25.Fi (Transport properties) 02.50.Cw (Probability theory) 05.65.+b (Self-organized systems)