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

作　　者：刘海 陈志鹏 庄革 孙岳 朱立志 肖持进 陈杰 

机构地区：[1]Institute of Fusion and Plasma Research,School of Electrical & Electronic Engineering,Huazhong University of Science and Technology [2]Key Laboratory of Geospace Environment,Chinese Academy of Sciences,University of Science & Technology of China [3]Department of Physics and Engineering Physics,University of Saskatchewan [4]Institute of Plasma Physics,Chinese Academy of Sciences

出　　处：《Plasma Science and Technology》2016年第6期601-606,共6页等离子体科学和技术（英文版）

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

摘　　要：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.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.

关 键 词：retarding field analyzer ion energy transport e-folding length magnetic connection length poloidal asymmetry 

分 类 号：TL631.24[核科学技术—核技术及应用] O484[理学—固体物理]