Experimental study of core and edge fluctuations by reflectometry on EAST tokamak  

作　　者：Zhen ZHOU Tao ZHANG Mingfu WU Kaixuan YE Fubin ZHONG Jia HUANG Kangning GENG Yukai LIU Gongshun LI Haoming XIANG Yumin WANG Fei WEN Sanqiu LIU 周振;张涛;吴茗甫;叶凯萱;钟富彬;黄佳;耿康宁;刘煜凯;李恭顺;向皓明;王嵎民;文斐;刘三秋(Jiangxi Province Key Laboratory of Fusion and Information Control,Institute of Fusion Energy and Plasma Application,Department of Physics,Nanchang University,Nanchang 330031,People’s Republic of China;Institute of Plasma Physics,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;Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,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 5180602,People’s Republic of China)

机构地区：[1]Jiangxi Province Key Laboratory of Fusion and Information Control,Institute of Fusion Energy and Plasma Application,Department of Physics,Nanchang University,Nanchang 330031,People’s Republic of China [2]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China [3]University of Science and Technology of China,Hefei 230026,People’s Republic of China [4]Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People’s Republic of China [5]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Optoelectronic Engineering,Shenzhen University,Shenzhen 5180602,People’s Republic of China

出　　处：《Plasma Science and Technology》2021年第7期8-14,共7页等离子体科学和技术（英文版）

基　　金：supported by the National Key R&D Program of China(No.2017YFE0301205);National Natural Science Foundation of China(Nos.11875289,11675211,11805136,and 12075284).

摘　　要：An eight-channel poloidal correlation reflectometer(PCR)with O-mode polarization has been installed in the EAST tokamak to measure the fluctuations from core to edge.The PCR launches eight different frequency microwaves(20.4,24.8,33,40,42.4,48,52.6,57.2 GHz)into the plasma from the low field side and two poloidally separated antennae are used to receive the reflected waves.As a result,the diagnostic can measure fluctuations in eight(radial)×two(poloidal)spatial positions.The diagnostic has been applied to study the core and edge pedestal fluctuations during an inter-ELM phase in H-mode plasma.This inter-ELM phase can be divided into two stages.In the first stage,a low frequency(<50 kHz)broadband fluctuation dominates in the pedestal gradient region.In the second stage,this fluctuation is strongly suppressed and quasi-coherent fluctuations(QCFs)appear.The QCF’s amplitude increases with the pedestal density gradient,implying density gradient driven instabilities.But the core fluctuations inside the pedestal show no evident changes during the inter-ELM phase.

关 键 词：core fluctuation edge fluctuation REFLECTOMETRY 

分 类 号：TL631.24[核科学技术—核技术及应用]