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

Radial profiles of the ion temperature,Ti,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,Bt = 1.8-2.0 T,Ip = 120-180 kA,ne =（2-2.5） × 10^19 m^-3）.Strongly declining Ti profiles in the SOL have been found.T...

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Published inPlasma science & technology Vol. 18; no. 6; pp. 601 - 606
Main Author 刘海 陈志鹏 庄革 孙岳 朱立志 肖持进 陈杰
Format Journal Article
LanguageEnglish
Published 01.06.2016
Subjects
Analyzers
Asymmetry
Energy use
Retarding
Roots
Similarity
Ti公司
Tokamak devices
Transport
减速
分析仪
径向分布
托卡马克
电场
离子能量
运输
Online AccessGet full text
ISSN1009-0630
DOI10.1088/1009-0630/18/6/04

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Summary:Radial profiles of the ion temperature,Ti,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,Bt = 1.8-2.0 T,Ip = 120-180 kA,ne =（2-2.5） × 10^19 m^-3）.Strongly declining Ti profiles in the SOL have been found.The different e-folding lengths,At,of the Ti profiles in two experimental configurations with different magnetic connection lengths,Lc,reveal that a longer Lc results in weaker parallel energy transport and longer At.In similarity with the particle transport across the SOL,At is approximately proportional to the square root of Lc.Additionally,the poloidal asymmetry has been identified with enhanced ion energy transport across the SOL on the low-field side.
Bibliography:retarding field analyzer; ion energy transport; e-folding length; magnetic connection length; poloidal asymmetry
34-1187/TL
LIU Hai,CHEN Zhipeng,ZHUANG Ge,SUN Yue,ZHU Lizhi,XIAO Chijin,CHEN Jie（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）
Radial profiles of the ion temperature,Ti,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,Bt = 1.8-2.0 T,Ip = 120-180 kA,ne =（2-2.5） × 10^19 m^-3）.Strongly declining Ti profiles in the SOL have been found.The different e-folding lengths,At,of the Ti profiles in two experimental configurations with different magnetic connection lengths,Lc,reveal that a longer Lc results in weaker parallel energy transport and longer At.In similarity with the particle transport across the SOL,At is approximately proportional to the square root of Lc.Additionally,the poloidal asymmetry has been identified with enhanced ion energy transport across the SOL on the low-field side.
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ISSN:1009-0630
DOI:10.1088/1009-0630/18/6/04