Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak

doi:10.1088/1741-4326/ac60e9

	Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak
	Zhong, X. M.1; Zou, X. L.2; Liu, A. D.1; Song, Y. T.3; Zhuang, G.1; Li, E. Z.3; Zhang, B.3; Zhang, J.1; Zhou, C.1; Feng, X.4
刊名	NUCLEAR FUSION
	2022-06-01
卷号	62
关键词	I-mode I-H transition pedestal burst instabilities density gradient
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac60e9
通讯作者	Liu, A. D.() ; Song, Y. T.(songyt@ipp.ac.cn)
英文摘要	Quasi-periodic pedestal burst instabilities (PBIs), featuring alternative turbulence suppression and bursts, have been clearly identified by various edge diagnostics during I-mode to H-mode transition in the EAST Tokamak. The radial distribution of the phase perturbation caused by PBI shows that PBI is localized in the pedestal. Prior to each PBI, a significant increase of density gradient close to the pedestal top can be clearly distinguished, then the turbulence burst is generated, accompanied by the relaxation of the density profile, and then induces an outward particle flux. The relative density perturbation caused by PBIs is about 6%-8%. Statistic analyses show that the pedestal normalized density gradient R/L (n) triggering the first PBI has a threshold value, mostly in the range of 22-24, suggesting that a PBI triggering instability could be driven by the density gradient. And R/L (n) triggering the last PBI is about 30-40 and seems to increase with the loss power and the chord-averaged density. In addition, the frequency of PBI is likely to be inversely proportional to the chord-averaged density and the loss power. These results suggest that PBIs and the density gradient prompt increase prior to PBIs can be considered as the precursor for controlling I-H transition.
资助项目	Natural Science Foundation of China[U1967206] ; Natural Science Foundation of China[11975231] ; Natural Science Foundation of China[11922513] ; National MCF Energy RD Program[2017YFE0301204] ; National MCF Energy RD Program[2018YFE0311200] ; Users with Excellence Program of Hefei Science Center CAS[2020HSC-UE009] ; FundamentalResearch Funds for the Central Universities
WOS关键词	EDGE-LOCALIZED MODES ; CONFINEMENT MODE ; REGIME ; SCATTERING ; BARRIER
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000783683200001
资助机构	Natural Science Foundation of China ; National MCF Energy RD Program ; Users with Excellence Program of Hefei Science Center CAS ; FundamentalResearch Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/128513]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, A. D.; Song, Y. T.
作者单位	1.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China 2.CEA, IRFM, F-13108 St Paul Les Durance, France 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230021, Anhui, Peoples R China 4.Shenzhen Univ, Shenzhen 518061, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Zhong, X. M.,Zou, X. L.,Liu, A. D.,et al. Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak[J]. NUCLEAR FUSION,2022,62.
APA	Zhong, X. M..,Zou, X. L..,Liu, A. D..,Song, Y. T..,Zhuang, G..,...&Zhang, X. J..(2022).Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak.NUCLEAR FUSION,62.
MLA	Zhong, X. M.,et al."Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak".NUCLEAR FUSION 62(2022).