Observation of intermittency in edge plasma of SUNIST tokamak |
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Authors: | Wang Wen-Hao He Ye-Xi Gao Zhe Zeng Li Zhang Guo-Ping Xie Li-Feng and Feng Chun-Hua |
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Institution: | Department of Engineering Physics, Tsinghua University, Beijing 100084, China; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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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. |
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Keywords: | intermittency spherical tokamak edge plasma turbulence transport |
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