Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of J-TEXT Tokamak Using Reciprocating Probe

SUN Yue (孙岳); CHEN Zhipeng (陈志鹏); WANG Zhijiang (王之江); ZHU Mengzhou (朱孟周); ZHUANG Ge (庄革); J-TEXT team

doi:10.1088/1009-0630/14/12/02

Plasma Science and Technology > 2012 > 14(12): 1041-1047. > DOI: 10.1088/1009-0630/14/12/02

SUN Yue (孙岳), CHEN Zhipeng (陈志鹏), WANG Zhijiang (王之江), ZHU Mengzhou (朱孟周), ZHUANG Ge (庄革), J-TEXT team. Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of J-TEXT Tokamak Using Reciprocating Probe[J]. Plasma Science and Technology, 2012, 14(12): 1041-1047. DOI: 10.1088/1009-0630/14/12/02

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Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of J-TEXT Tokamak Using Reciprocating Probe

1.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Key Laboratory of Geospace Environment, University of Science & Technology of China, Chinese Academy of Sciences, Hefei 230026, China

Funds: support by Open Research Program from Key Laboratory of Geospace Environment, Chinese Academy of Sciences

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Abstract

Abstract

As the basic of a deeper investigation on the turbulent transport, the fluctuation property in the boundary of the newly-reconstructed Joint Texas Experimental Tokamak (J-TEXT) is studied experimentally using the reciprocating Langmuir four-tip probe, which has been built and operated as the primary diagnostic tool in the boundary of J-TEXT tokamak. In this paper, spatial profiles of the plasma-edge parameters are obtained, such as electron temperature, plasma density, plasma potential, poloidal electric field and their fluctuations. The results indicate the existence of a Er×BT shear layer at the vicinity of last closed flux surface (LCFS), with the fluctuations suppressed in varying degrees. The turbulence-induced particle and energy fluxes can be calculated by the local plasma parameters above. Convection dominates the cross-field turbulent transport in boundary plasma. Electrostatic fluctuations properties are also studied in detail with the help of numerical analysis. Statistical analysis on density fluctuation shows that, the intermittency can affect the turbulence in the scrape-off layer (SOL).
- electrostatic fluctuations,
- anomalous transport,
- J-TEXT,
- reciprocating Langmuir probe

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