Investigation of the Ion Energy Transport in the Scrape-Off Layer on the J-TEXT Tokamak Using a Retarding Field Analyzer

LIU Hai (刘海); CHEN Zhipeng (陈志鹏); ZHUANG Ge (庄革); SUN Yue (孙岳); ZHU Lizhi (朱立志); XIAO Chijin (肖持进); CHEN Jie (陈杰)

doi:10.1088/1009-0630/18/6/04

Plasma Science and Technology > 2016 > 18(6): 601-606. > DOI: 10.1088/1009-0630/18/6/04

LIU Hai (刘海), CHEN Zhipeng (陈志鹏), ZHUANG Ge (庄革), SUN Yue (孙岳), ZHU Lizhi (朱立志), XIAO Chijin (肖持进), CHEN Jie (陈杰). Investigation of the Ion Energy Transport in the Scrape-Off Layer on the J-TEXT Tokamak Using a Retarding Field Analyzer[J]. Plasma Science and Technology, 2016, 18(6): 601-606. DOI: 10.1088/1009-0630/18/6/04

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Investigation of the Ion Energy Transport in the Scrape-Off Layer on the J-TEXT Tokamak Using a Retarding Field Analyzer

1Institute of Fusion and Plasma Research, School of Electrical & Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 2Key Laboratory of Geospace Environment, Chinese Academy of Sciences, University of Science & Technology of China, Hefei 230026, China 3Department of Physics and Engineering Physics, University of Saskatchewan, S7N 5E2, Canada 4Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by National Natural Science Foundation of China (No. 11305070), the Ministry of Science and Technology (No. 2013GB106001) and the Open Foundation of the Key Laboratory of Geospace Environment, the CSA/SAFEA International Partnership Program for Creative Research Teams

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Received Date: April 21, 2015

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Abstract

Abstract

Radial profiles of the ion temperature, T_i, have been measured by a double-sided retarding field analyzer (RFA) in the scrape-off layer (SOL) of the J-TEXT tokamak (R = 105 cm, r= 25-29 cm, B_t=1.8-2.0 T, I_p = 120 -180 kA, n_e = (2-2.5) × 10¹⁹ m^-3). Strongly declining T_i profiles in the SOL have been found. The different e-folding lengths, λ_T, of the T_iprofiles in two experimental configurations with different magnetic connection lengths, L_c, reveal that a longer L_c results in weaker parallel energy transport and longer λ_T . In similarity with the particle transport across the SOL, λ_Tis approximately proportional to the square root of L_c. Additionally, the poloidal asymmetry has been identified with enhanced ion energy transport across the SOL on the low-field side.
- retarding field analyzer,
- ion energy transport,
- e-folding length,
- magnetic connection length,
- poloidal asymmetry

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References

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