Observation of Doppler shift f_(D) modulated by the internal kink mode using conventional reflectometry in the EAST tokamak  

作　　者：李恭顺 张涛 耿康宁 文斐 叶凯萱 徐立清 朱翔 张学习 钟富彬 周振 杨书琪 周子强 喻琳 兰婷 王守信 提昂 张寿彪 刘海庆 李国强 高翔 the EAST Team Gongshun LI;Tao ZHANG;Kangning GENG;Fei WEN;Kaixuan YE;Liqing XU;Xiang ZHU;Xuexi ZHANG;Fubin ZHONG;Zhen ZHOU;Shuqi YANG;Ziqiang ZHOU;Lin YU;Ting LAN;Shouxin WANG;Ang TI;Shoubiao ZHANG;Haiqing LIU;Guoqiang LI;Xiang GAO;the EAST Team(Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People's Republic of China;University of Science and Technology of China,Hefei 230026,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]Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People's Republic of China [3]University of Science and Technology of China,Hefei 230026,People's Republic of China

出　　处：《Plasma Science and Technology》2024年第3期1-9,共9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(Nos.2022YFE03050003,2022YFE03020004,2019YFE03080200 and 2022YFE03070004);National Natural Science Foundation of China(Nos.12275315,11875289,12175277 and 11975271);partly supported by the Youth Science and Technology Talents Support Program(2020)by Anhui Association for Science and Technology(No.RCTJ202009);the Science Foundation of Institute of Plasma Physics,Chinese Academy of Sciences(No.DSJJ2021-08);the China Postdoctoral Science Foundation(No.2021M703256);the Director Funding of Hefei Institutes of Physical Science,Chinese Academy of Sciences(No.YZJJ2022QN16)。

摘　　要：In this paper we present a new experimental observation using a conventional reflectometry technique,poloidal correlation reflectometry(PCR),in the Experimental Advanced Superconducting Tokamak(EAST).The turbulence spectrum detected by the PCR system exhibits an asymmetry and induced Doppler shift f_(D)during the internal kink mode(IKM)rotation phase.This Doppler shift f_(D)is the target measurement of Doppler reflectometry,but captured by conventional reflectometry.Results show that the Doppler shift f_(D)is modulated by the periodic changes in the effective angle between the probing wave and cutoff layer normal,but not by plasma turbulence.The fishbone mode and saturated long-lived mode are typical IKMs,and this modulation phenomenon is observed in both cases.Moreover,the value of the Doppler shift f_(D)is positively correlated with the amplitude of the IKM,even when the latter is small.However,the positive and negative frequency components of the Doppler shift f_(D)can be asymmetric,which is related to the plasma configuration.A simulated analysis is performed by ray tracing to verify these observations.These results establish a clear link between f_(D)and IKM rotation,and are helpful for studying the characteristics of IKM and related physical phenomena.

关 键 词：microwave reflectometry Doppler shift internal kink mode 

分 类 号：TL631.24[核科学技术—核技术及应用]