Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas

doi:10.1088/1741-4326/ab742e

HFCAS OpenIR

	Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas
	Sun, P. J.1; Li, Y. D.1; Ren, Y.2 ; Zhang, X. D.1; Wu, G. J.1; Wang, Y. M.1; Liu, Y.1 ; Zhou, T. F.1; Gu, X.1; Yuan, X. Q.3; Zang, Q.1 ; Li, P.1; Chen, Y. J.1; Duan, Y. M.1; Mao, S. T.1; Zhang, B.4 ; Shi, T. H.1; Liu, H. Q.1; Lyu, B.1; Hu, L. Q.1; Li, J. G.1
	2020-04-01
发表期刊	NUCLEAR FUSION
ISSN	0029-5515
通讯作者	Sun, P. J.(sunpj@ipp.cas.cn)
摘要	In this paper, we present experimental studies of both high-k(r) ( cm(-1), and , respectively; ) and high- ( cm(-1), and , respectively; ) turbulence behavior during an ohmic energy confinement degradation phase in experimental advanced superconducting tokamak (EAST). High-k(r) turbulence from density fluctuation at and high- turbulence from density fluctuation at -0.97 were measured by tangential and poloidal CO2 laser collective scattering diagnostics, respectively. Note that k(r), , and are radial wavenumber, poloidal wavenumber, perpendicular wavenumber and ion gyroradius at electron temperature, respectively. Both high-k(r)/ turbulence power and energy confinement time are found to be temporally correlated to line-averaged electron density n(e) in the plasma current flat-top phase (I-p = 0.4 MA): when the n(e) shows continuous increase/decrease, the high-k(r)/ turbulence power increases/decreases correspondingly and the shows corresponding decrease/increase; the stable n(e) is related to stable both and high-k(r)/ turbulence power. Statistical results of high-k(r)/ turbulence power versus further imply that high-k(r)/ turbulence shows a strong correlation with plasma energy confinement degradation in high line-averaged n(e) condition, but high-k(r) and high- turbulence have relatively weak and no dependence on the transition between linear range in low-n(e) condition and energy confinement degradation in the high-n(e) condition, respectively. Moreover, profiles of electron temperature T-e and n(e) as well as their normalized gradients in a part of high- density fluctuation measurement region also have been given to qualitatively explain the enhancement of turbulence power with the increase of line-averaged n(e).
关键词	turbulence high-k transport EAST tokamak energy confinement
DOI	10.1088/1741-4326/ab742e
关键词[WOS]	DENSITY-FLUCTUATIONS ; PROFILE ; BACKSCATTERING ; SCATTERING ; ETG
收录类别	SCI
语种	英语
资助项目	Collaborative Innovation Program of Hefei Science Center, CAS[2019HSC-CIP014] ; National Natural Science Foundation of China[11875286] ; National Natural Science Foundation of China[11475222] ; National Natural Science Foundation of China[11505228] ; National Natural Science Foundation of China[11735016] ; National Natural Science Foundation of China[11575238] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH001] ; K.C. Wong Education Foundation ; CASHIPS Directors Fund[BJPY2019A01]
项目资助者	Collaborative Innovation Program of Hefei Science Center, CAS ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; K.C. Wong Education Foundation ; CASHIPS Directors Fund
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000519028700001
出版者	IOP PUBLISHING LTD
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/103948
专题	中国科学院合肥物质科学研究院
通讯作者	Sun, P. J.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA 3.Argonne Natl Lab, Lemont, IL 60439 USA 4.East China Univ Technol, Nanchang 330013, Jiangxi, Peoples R China
第一作者单位	中科院等离子体物理研究所
通讯作者单位	中科院等离子体物理研究所
推荐引用方式 GB/T 7714	Sun, P. J.,Li, Y. D.,Ren, Y.,et al. Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas[J]. NUCLEAR FUSION,2020,60.
APA	Sun, P. J..,Li, Y. D..,Ren, Y..,Zhang, X. D..,Wu, G. J..,...&Li, J. G..(2020).Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas.NUCLEAR FUSION,60.
MLA	Sun, P. J.,et al."Experimental study of high-k turbulence during an energy confinement degradation phase in EAST ohmic plasmas".NUCLEAR FUSION 60(2020).