Combined Langmuir-magnetic probe measurements of type-Ⅰ ELMy filaments in the EAST tokamak  

作　　者：Qingquan YANG Fangchuan ZHONG Guosheng XU Ning YAN Liang CHEN Xiang LIU Yong LlU Liang WANG Zhendong YANG Yifeng WANG Yang YE Heng ZHANG Xiaoliang LI 杨清泉;钟方川;徐国盛;颜宁;陈良;刘祥;刘永;王亮;仰振东;王一丰;叶扬;张恒;李小良(Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People＇s Republic of China;University of Science and Technology of China,Hefei 230036,People＇s Republic of China;College Of Science,Donghua University,Shanghai 201620,People＇s Republic of China 4College of Electrical Engineering,Tongling University,Tongling 244000,People＇s Republic of China)

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China [2]University of Science and Technology of China, Hefei 230036, People's Republic of China [3]College of Science, Donghua University, Shanghai 201620, People's Republic of China [4]College of Electrical Engineering, Tongling University, Tongling 244000, People's Republic of China

出　　处：《Plasma Science and Technology》2018年第6期17-22,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 under Contracts Nos.11275047,11705128,11422546,11575235,11575236 and 11505222;Key Research Program of Frontier Sciences,CAS,Grant No.QYZDB-SSWSLH001;National Magnetic Confinement Fusion Science Program of China under Contract Nos.2015GB101000 and 2013GB107003

摘　　要：Detailed investigations on the filamentary structures associated with the type-I edge-localized modes（ELMs） should be helpful for protecting the materials of a plasma-facing wall on a future large device.Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak（EAST） using combined Langmuir-magnetic probes.The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 kms^（-1） in the far scrape-off layer（SOL） region.It is remarkable that the electron temperature of these filaments is detected to be ~50eV,corresponding to a fraction of 1/6 to the temperature near the pedestal top,while the density ~3×10^（19）m^（-3） of these filaments could be approximate to the line-averaged density.In addition,associated magnetic fluctuations have been clearly observed at the same time,which show good agreement with the density perturbations.A localized current on the order of ~100kA could be estimated within the filaments.Detailed investigations on the filamentary structures associated with the type-I edge-localized modes（ELMs） should be helpful for protecting the materials of a plasma-facing wall on a future large device.Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak（EAST） using combined Langmuir-magnetic probes.The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 kms^（-1） in the far scrape-off layer（SOL） region.It is remarkable that the electron temperature of these filaments is detected to be ~50eV,corresponding to a fraction of 1/6 to the temperature near the pedestal top,while the density ~3×10^（19）m^（-3） of these filaments could be approximate to the line-averaged density.In addition,associated magnetic fluctuations have been clearly observed at the same time,which show good agreement with the density perturbations.A localized current on the order of ~100kA could be estimated within the filaments.

关 键 词：type-Ⅰ ELMy filaments Langmuir-magnetic probe EAST tokamak 

分 类 号：TL631.24[核科学技术—核技术及应用] TQ028.15[化学工程]