中国物理B ›› 2004, Vol. 13 ›› Issue (12): 2091-2096.doi: 10.1088/1009-1963/13/12/020

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Observation of intermittency in edge plasma of SUNIST tokamak

冯春华1, 王文浩2, 何也熙2, 高喆2, 曾立2, 张国平2, 解丽凤2   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 收稿日期:2004-06-21 修回日期:2004-08-20 出版日期:2004-12-17 发布日期:2005-03-17
  • 基金资助:
    Project supported by the National Natura1 Science Foundation of China (Grants Nos 10275041, 10235010 and 10375089) and by China Postdoctoral Science Foundation.

Observation of intermittency in edge plasma of SUNIST tokamak

Wang Wen-Hao (王文浩)a, He Ye-Xi (何也熙)a, Gao Zhe (高喆)a, Zeng Li (曾立)a, Zhang Guo-Ping (张国平)a, Xie Li-Feng (解丽凤)a, Feng Chun-Hua(冯春华)b    

  1. a Department of Engineering Physics, Tsinghua University, Beijing 100084, China; b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2004-06-21 Revised:2004-08-20 Online:2004-12-17 Published:2005-03-17
  • Supported by:
    Project supported by the National Natura1 Science Foundation of China (Grants Nos 10275041, 10235010 and 10375089) and by China Postdoctoral Science Foundation.

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摘要： The temporal intermittency of the fluctuation-driven particle transport fluxes is analysed by using data obtained from Langmuir probe array in the edge of the Sino-United Spherical Tokamak (SUNIST). The conditional statistics analysis indicates that the intermittent structures have a characteristic time width of about 30μs, which is the typical fluctuation time scaling. It is also found that the transport fluxes have a multifractal character over the fluctuation time scales, and exhibit a long-time-range correlation character with self-similar parameter H>0.5 in the plasma confinement time scales. Furthermore, the analyses show that the level of the intermittency and the long-range correlation of the fluxes vary with increasing plasma density. These observations are consistent with the prediction of the avalanche-like model.

关键词: intermittency, spherical tokamak, edge plasma turbulence transport

Abstract: The temporal intermittency of the fluctuation-driven particle transport fluxes is analysed by using data obtained from Langmuir probe array in the edge of the Sino-United Spherical Tokamak (SUNIST). The conditional statistics analysis indicates that the intermittent structures have a characteristic time width of about 30μs, which is the typical fluctuation time scaling. It is also found that the transport fluxes have a multifractal character over the fluctuation time scales, and exhibit a long-time-range correlation character with self-similar parameter $H>0.5$ in the plasma confinement time scales. Furthermore, the analyses show that the level of the intermittency and the long-range correlation of the fluxes vary with increasing plasma density. These observations are consistent with the prediction of the avalanche-like model.

Key words: intermittency, spherical tokamak, edge plasma turbulence transport

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

  • 52.40.Hf
52.55.Fa (Tokamaks, spherical tokamaks) 52.25.Fi (Transport properties) 52.70.Ds (Electric and magnetic measurements) 52.35.Ra (Plasma turbulence) 52.25.Gj (Fluctuation and chaos phenomena)