Preliminary Study of the Magnetic Perturbation Effects on the Edge Density Profiles and Fluctuations Using Reflectometers on EAST  

作　　者：GAO Yu WANG Yumin ZHANG Tao ZHANG Shoubiao QU Hao MAN Xiang WEN Fei KONG Defeng HUANG Canbin CAI Jianqing SUN Youwen LIANG Yunfeng GAO Xiang  EAST Team 高宇;王嵎民;张涛;张寿彪;屈浩;韩翔;文斐;孔德峰;黄灿斌;蔡剑青;孙有文;梁云峰;高翔;EAST Team(University of Science and Technology of China,Hefei 230026,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;IEK-4,Forschungszentrum Jiilich,Association EURATOM-FZJ,52425 Jiilich,Germany;不详)

机构地区：[1]University of Science and Technology of China, Hefei 230026, China [2]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 3IEK-4, Forschungszentrum Jiilich, Association EURATOM-FZJ, 52425 Jiilich, Germany

出　　处：《Plasma Science and Technology》2016年第9期879-883,共5页等离子体科学和技术（英文版）

基　　金：supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2014GB106000,2014GB106003 and2015GB110001);National Natural Science Foundation of China(Nos.11275234,11305215,11305208,11405214 and 11505221)

摘　　要：The resonant magnetic perturbation （RMP） coils have been successfully designed and installed on the Experimental Advanced Superconducting Tokamak （EAST）. Using the reflectometer systems, the density profile and the density fluctuations during magnetic perturbations （MPs） phase have been investigated. During the experiments, two different cases are studied separately： steady MPs and rotating MPs. In both cases, a strongly density pump-out has been observed. In the steady MPs cases, an enhancement of the low frequency （〈60 kHz） density fluctuations in H-mode phase has been observed. The plasma density boundary out-shifts 5~ caused by the MPs. The pedestal density gradient is reduced by 50%, while the radial location nearly stays unchanged. In the rotating MPs, the line-averaged density, the D~ emission at the divertor region and the spectrum of the density fluctuations are modulated. The results suggest that the low frequency （〈60 kHz） density fluctuations may contribute to the strong density pump-out.The resonant magnetic perturbation （RMP） coils have been successfully designed and installed on the Experimental Advanced Superconducting Tokamak （EAST）. Using the reflectometer systems, the density profile and the density fluctuations during magnetic perturbations （MPs） phase have been investigated. During the experiments, two different cases are studied separately： steady MPs and rotating MPs. In both cases, a strongly density pump-out has been observed. In the steady MPs cases, an enhancement of the low frequency （〈60 kHz） density fluctuations in H-mode phase has been observed. The plasma density boundary out-shifts 5~ caused by the MPs. The pedestal density gradient is reduced by 50%, while the radial location nearly stays unchanged. In the rotating MPs, the line-averaged density, the D~ emission at the divertor region and the spectrum of the density fluctuations are modulated. The results suggest that the low frequency （〈60 kHz） density fluctuations may contribute to the strong density pump-out.

关 键 词：magnetic perturbations microwave reflectometer density profile densityfluctuation TOKAMAK 

分 类 号：TL631.24[核科学技术—核技术及应用] S762[农业科学—森林保护学]