Observation and analysis of lower-hybrid-current-drive density limit in EAST

doi:10.1088/1741-4326/ac99ed

	Observation and analysis of lower-hybrid-current-drive density limit in EAST
	Li, M. H.2; Baek, S. G.3; Wallace, G. M.3; Ding, B. J.2; Wu, C. B.2; Yan, G. H.2; Bonoli, P. T.3; Wang, M.2; Liu, L.2; Zhao, L. M.2
刊名	NUCLEAR FUSION
	2022-12-01
卷号	62
关键词	lower hybrid current drive current drive efficiency density limit parametric decay instability wave accessibility
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac99ed
通讯作者	Ding, B. J.(bjding@ipp.ac.cn) ; Wang, M.(mwang@ipp.ac.cn)
英文摘要	Lower hybrid current drive (LHCD) experiments with line-averaged density up to similar to 5.1 x 10(19) m(-3) were performed in EAST L-mode plasmas. When the line-averaged density rises above a critical value, the hard x-ray (HXR) emission falls to the noise level, indicating that the LHCD density limit is encountered. The experimental results show that the LHCD density limit can be increased with higher wave source frequency (f (0)) and higher magnetic field (B (t)). Although a higher LHCD density limit is obtained by a higher magnetic field for both 2.45 GHz and 4.6 GHz waves, the results show a stronger dependence on the magnetic field for the 4.6 GHz case. Analysis suggests that, for normal operation with a relatively low magnetic field (1.6 T <= B (t) <= 2.5 T) on EAST, the dominant mechanisms responsible for the LHCD density limit are different between the 2.45 GHz and 4.6 GHz waves. The wave accessibility plays a more significant role during 4.6 GHz LHCD experiments, while parasitic losses due to parametric decay instability (PDIs) dominate the accessibility issue in the 2.45 GHz case. Collisional loss in the scrape-off layer (SOL) may explain the 4.6 GHz result when combined with the accessibility limit at high density and low temperature.
资助项目	National Natural Science Foundation of China[11775259] ; National Natural Science Foundation of China[11975266] ; National Natural Science Foundation of China[11805233] ; National Natural Science Foundation of China[11975276] ; Comprehensive Research Facility for Fusion Technology Program of China[2018-000052-73-01-001228] ; Anhui Provincial Natural Science Foundation[2008085J04] ; US Department of Energy[DE-SC0010492]
WOS关键词	PARAMETRIC-INSTABILITIES ; PROFILE CONTROL ; EFFICIENCY ; WAVES ; RANGE
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000880827400001
资助机构	National Natural Science Foundation of China ; Comprehensive Research Facility for Fusion Technology Program of China ; Anhui Provincial Natural Science Foundation ; US Department of Energy
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130116]
专题	中国科学院合肥物质科学研究院
通讯作者	Ding, B. J.; Wang, M.
作者单位	1.Univ South China, Dept Nucl Phys, Hengyang 421001, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 3.MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
推荐引用方式 GB/T 7714	Li, M. H.,Baek, S. G.,Wallace, G. M.,et al. Observation and analysis of lower-hybrid-current-drive density limit in EAST[J]. NUCLEAR FUSION,2022,62.
APA	Li, M. H..,Baek, S. G..,Wallace, G. M..,Ding, B. J..,Wu, C. B..,...&Gong, X. Z..(2022).Observation and analysis of lower-hybrid-current-drive density limit in EAST.NUCLEAR FUSION,62.
MLA	Li, M. H.,et al."Observation and analysis of lower-hybrid-current-drive density limit in EAST".NUCLEAR FUSION 62(2022).