Characteristics of grassy ELMs and their impact on the divertor heat flux width

doi:10.1088/1741-4326/ac83d9

HFCAS OpenIR

	Characteristics of grassy ELMs and their impact on the divertor heat flux width
	Li, Nami 1,2; Xu, X. Q.1; Wang, Y. F.3; Yan, N.3 ; Zhang, J. Y.3; Qian, J. P.3; Sun, J. Z.2; Wang, D. Z.2
	2022-09-01
发表期刊	NUCLEAR FUSION
ISSN	0029-5515
通讯作者	Li, Nami(li55@llnl.gov)
摘要	BOUT++ turbulence simulations are conducted for a 60 s steady-state long pulse high beta (p) EAST grassy ELM discharge. BOUT++ linear simulations show that the unstable mode spectrum covers a range of toroidal mode numbers from low-n (n = 10-15) peeling-ballooning modes (P-B) to high-n (n = 40-80) drift-Alfven instabilities. Nonlinear simulations show that the ELM crash is triggered by low-n peeling modes and fluctuation is generated at the peak pressure gradient position and radially spread outward into the scrape-off-layer, even though the drift-Alfven instabilities dominate the linear growth phase. However, drift-Alfven turbulence delays the onset of the grassy ELM and enhances the energy loss with the fluctuation extending to pedestal top region. Simulations further show that if the peeling drive is removed, the fluctuation amplitude drops by an order of magnitude and the ELM crashes disappear. The divertor heat flux width is similar to 2 times larger than the estimates based on the HD model and the Eich's ITPA multi-tokamak scaling (or empirical Eich scaling) due to the strong radial turbulence transport.
关键词	grassy ELM BOUT plus plus turbulence heat flux width
DOI	10.1088/1741-4326/ac83d9
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFE0301206] ; National Key R&D Program of China[2017YFE0300402] ; National Key R&D Program of China[2017YFE0301100] ; Users with Excellence Program of Hefei Science Center, CAS[2021HSC-UE014] ; National Natural Science Foundation of China[11675037] ; US Department of Energy by Lawrence Livermore National Laboratory[DE-AC52-07NA27344] ; US Department of Energy by Lawrence Livermore National Laboratory[LLNL-JRNL-833914]
项目资助者	National Key R&D Program of China ; Users with Excellence Program of Hefei Science Center, CAS ; National Natural Science Foundation of China ; US Department of Energy by Lawrence Livermore National Laboratory
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000840498400001
出版者	IOP Publishing Ltd
引用统计	被引频次：6[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/334002/132080
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Nami
作者单位	1.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA 2.Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Li, Nami,Xu, X. Q.,Wang, Y. F.,et al. Characteristics of grassy ELMs and their impact on the divertor heat flux width[J]. NUCLEAR FUSION,2022,62.
APA	Li, Nami.,Xu, X. Q..,Wang, Y. F..,Yan, N..,Zhang, J. Y..,...&Wang, D. Z..(2022).Characteristics of grassy ELMs and their impact on the divertor heat flux width.NUCLEAR FUSION,62.
MLA	Li, Nami,et al."Characteristics of grassy ELMs and their impact on the divertor heat flux width".NUCLEAR FUSION 62(2022).