VUV imaging of type-ⅠELM filamentary structures and their temporal characteristics on EAST  

作　　者：Rongjing DENG Tingfeng MING Bang LI Qiqi SHI Shanwei HOU Shuqi YANG Xiaoju LIU Shaocheng LIU Guoqiang LI Xiang GAO Yasuhiro SUZUKI Yunfeng LIANG 邓荣婧;明廷凤;李邦;石奇奇;侯善伟;杨书琪;刘晓菊;刘少承;李国强;高翔;Yasuhiro SUZUKI;梁云峰(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China;University of Science and Technology of China,Hefei 230026,People’s Republic of China;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of China;Graduate School of Advanced Science and Engineering,Hiroshima University,Higashi-Hiroshima 739-8527,Japan;Forschungszentrum Jülich GmbH,Institut für Energie-und Klimaforschung-Plasmaphysik,Jülich D-52425,Germany)

机构地区：[1]Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China [2]University of Science and Technology of China,Hefei 230026,People’s Republic of China [3]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of China [4]Graduate School of Advanced Science and Engineering,Hiroshima University,Higashi-Hiroshima 739-8527,Japan [5]Forschungszentrum Jülich GmbH,Institut für Energie-und Klimaforschung-Plasmaphysik,Jülich D-52425,Germany

出　　处：《Plasma Science and Technology》2024年第11期22-31,共10页等离子体科学和技术（英文版）

基　　金：supported in part by the National Key R&D Program of China(Nos.2019YFE03080200,2022YFE03030001 and 2022YFE03050003);National Natural Science Foundation of China(Nos.12075284,12075283 and 12175277)。

摘　　要：In the H-mode experiments conducted on the Experimental Advanced Superconducting Tokamak(EAST),fluctuations induced by the so-called edge localized modes(ELMs)are captured by a high-speed vacuum ultraviolet(VUV)imaging system.Clear field line-aligned filamentary structures are analyzed in this work.Ion transport induced by ELM filaments in the scrape-off layer(SOL)under different discharge conditions is analyzed by comparing the VUV signals with the divertor probe signals.It is found that convective transport along open field lines towards the divertor target dominates the parallel ion particle transport mechanism during ELMs.The toroidal mode number of the filamentary structure derived from the VUV images increases with the electron density pedestal height.The analysis of the toroidal distribution characteristics during ELM bursts reveals toroidal asymmetry.The influence of resonance magnetic perturbation(RMP)on the ELM size is also analyzed using VUV imaging data.When the phase difference of the coil changes periodically,the widths of the filaments change as well.Additionally,the temporal evolution of the ELMs on the VUV signals provides rise time and decay time for each single ELM event,and the results indicate a negative correlation trend between these two times.

关 键 词：EAST tokamak VUV imaging filamentary structure temporal characteristics RMP 

分 类 号：TL631.24[核科学技术—核技术及应用]