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Chin. Phys., 2004, Vol. 13(12): 2091-2096    DOI: 10.1088/1009-1963/13/12/020

Observation of intermittency in edge plasma of SUNIST tokamak

Feng Chun-Huaa, Wang Wen-Haob, He Ye-Xib, Gao Zheb, Zeng Lib, Zhang Guo-Pingb, Xie Li-Fengb
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Engineering Physics, Tsinghua University, Beijing 100084, China
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.
Keywords:  intermittency      spherical tokamak      edge plasma turbulence transport  
Received:  21 June 2004      Revised:  20 August 2004      Published:  17 March 2005
PACS:  52.40.Hf (Plasma-material interactions; boundary layer effects)  
  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)  
Fund: Project supported by the National Natura1 Science Foundation of China (Grants Nos 10275041, 10235010 and 10375089) and by China Postdoctoral Science Foundation.

Cite this article: 

Feng Chun-Hua, Wang Wen-Hao, He Ye-Xi, Gao Zhe, Zeng Li, Zhang Guo-Ping, Xie Li-Feng Observation of intermittency in edge plasma of SUNIST tokamak 2004 Chin. Phys. 13 2091

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