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

GAO Yu (高宇); WANG Yumin (王嵎民); ZHANG Tao (张涛); ZHANG Shoubiao (张寿彪); QU Hao (屈浩); HAN Xiang (韩翔); WEN Fei (文斐); KONG Defeng (孔德峰); HUANG Canbin (黄灿斌); CAI Jianqing (蔡剑青); SUN Youwen (孙有文); LIANG Yunfeng (梁云峰); GAO Xiang (高翔); EAST Team

doi:10.1088/1009-0630/18/9/01

Plasma Science and Technology > 2016 > 18(9): 879-883. > DOI: 10.1088/1009-0630/18/9/01

GAO Yu (高宇), WANG Yumin (王嵎民), ZHANG Tao (张涛), ZHANG Shoubiao (张寿彪), QU Hao (屈浩), HAN Xiang (韩翔), WEN Fei (文斐), KONG Defeng (孔德峰), HUANG Canbin (黄灿斌), CAI Jianqing (蔡剑青), SUN Youwen (孙有文), LIANG Yunfeng (梁云峰), GAO Xiang (高翔), EAST Team. Preliminary Study of the Magnetic Perturbation Effects on the Edge Density Profiles and Fluctuations Using Reflectometers on EAST[J]. Plasma Science and Technology, 2016, 18(9): 879-883. DOI: 10.1088/1009-0630/18/9/01

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

1 University of Science and Technology of China, Hefei 230026, China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 3 IEK-4, Forschungszentrum Jülich, Association EURATOM-FZJ, 52425 Jülich, Germany

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB106000, 2014GB106003 and 2015GB110001), and National Natural Science Foundation of China (Nos. 11275234, 11305215, 11305208, 11405214 and 11505221)

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Received Date: November 28, 2015

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Abstract

Abstract

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 α 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.
- magnetic perturbations,
- microwave reflectometer,
- density profile,
- density fluctuation,
- tokamak

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[1]	Shaobo GONG, Yi YU, Min XU, Aiping SUN, Tao LAN, Lin NIE, Rui KE, Ting LONG, Hao LIU, Yifan WU, Boda YUAN, Huajie WANG, Jinbang YUAN, Zhongbing SHI, Wulv ZHONG, Shifeng MAO, Minyou YE, Xuru DUAN. Progress of plasma density fluctuation measurements with phase contrast imaging on HL-2A tokamak[J]. Plasma Science and Technology, 2019, 21(8): 84001-084001. DOI: 10.1088/2058-6272/ab0054
[2]	Linghan WAN (万凌寒), Zhoujun YANG (杨州军), Ruobing ZHOU (周若冰), Xiaoming PAN (潘晓明), Chi ZHANG (张弛), Xianli XIE (谢先立), Bowen RUAN (阮博文). Design of Q-band FMCW reflectometry for electron density profile measurement on the Joint TEXT tokamak[J]. Plasma Science and Technology, 2017, 19(2): 25602-025602. DOI: 10.1088/2058-6272/19/2/025602
[3]	SHI Peiwan (施培万), SHI Zhongbing (石中兵), CHEN Wei (陈伟), ZHONG Wulyu (钟武律), YANG Zengchen (杨曾辰), JIANG Min (蒋敏), ZHANG Boyu (张博宇), LI Yonggao (李永高), YU Liming (于利明), LIU Zetian (刘泽田), DING Xuantong (丁玄同). Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak[J]. Plasma Science and Technology, 2016, 18(7): 708-713. DOI: 10.1088/1009-0630/18/7/02
[4]	KE Xin (柯新), CHEN Zhipeng (陈志鹏), BA Weigang (巴为刚), SHU Shuangbao (舒双宝), GAO Li (高丽), ZHANG Ming (张明), ZHUANG Ge (庄革). The Construction of Plasma Density Feedback Control System on J-TEXT Tokamak[J]. Plasma Science and Technology, 2016, 18(2): 211-216. DOI: 10.1088/1009-0630/18/2/20
[5]	QU Hao (屈浩), ZHANG Tao (张涛), ZHANG Shoubiao (张寿彪), WEN Fei (文斐), WANG Yumin (王嵎民), KONG Defeng (孔德峰), HAN Xiang (韩翔), YANG Yao (杨曜), GAO Yu (高宇), HUANG Canbin (黄灿斌), CAI Jianqing (蔡剑青), GAO Xiang (高翔), the EAST team. Q-Band X-Mode Reflectometry and Density Profile Reconstruction[J]. Plasma Science and Technology, 2015, 17(12): 985-990. DOI: 10.1088/1009-0630/17/12/01
[6]	ZHU Xiang (朱翔), ZENG Long (曾龙), LIU Haiqing (刘海庆), JIE Yinxian (揭银先), ZHANG Shoubiao (张寿彪), HU Jiansheng (胡建生), GAO Xiang (高翔). Reconstruction of the Density Profile for the EAST Tokamak Based on Polarimeter/Interferometer and Microwave Reflectometer Systems[J]. Plasma Science and Technology, 2015, 17(9): 733-737. DOI: 10.1088/1009-0630/17/9/03
[7]	ZHANG Shoubiao(张寿彪), GAO Xiang(高翔), LING Bili(凌必利), WANG Yumin(王嵎民), ZHANG Tao(张涛), HAN Xiang(韩翔), LIU Zixi(刘子奚), BU Jingliang(布景亮), LI Jiangang(李建刚), EAST team. Density Profile and Fluctuation Measurements by Microwave Reflectometry on EAST[J]. Plasma Science and Technology, 2014, 16(4): 311-315. DOI: 10.1088/1009-0630/16/4/02
[8]	ZHANG Chongyang (张重阳), LIU Ahdi (刘阿娣), LI Hong (李弘), LI Bin (李斌), et al.. X-Mode Frequency Modulated Density Profile Reflectometer on EAST Tokamak[J]. Plasma Science and Technology, 2013, 15(9): 857-862. DOI: 10.1088/1009-0630/15/9/04
[9]	FU Jia (符佳), LI Yingying (李颖颖), SHI Yuejiang (石跃江), WANG Fudi (王福地), ZHANG Wei (张伟), LV Bo (吕波), HUANG Juang (黄娟), WAN Baonian (万宝年), ZHOU Qian (周倩). Spectroscopic Measurements of Impurity Spectra on the EAST Tokamak[J]. Plasma Science and Technology, 2012, 14(12): 1048-1053. DOI: 10.1088/1009-0630/14/12/03
[10]	GUO Wei, WANG Shaojie, LI Jiangang. Vacuum Poloidal Magnetic Field of Tokamak in Alternating-Current Operation[J]. Plasma Science and Technology, 2010, 12(6): 657-660.