Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D

doi:10.1088/1741-4326/ac4acf

	Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D
	Li,Zeyu 8; Chen,Xi 2; Muscatello,C. M.2; Burrell,K.H.2; Xu,Xueqiao 3; Zhu,Ben 3; Hong,Rongjie 4; Osborne,T.H.2; Grierson,B. A.5; Rhodes,T.L.4
刊名	Nuclear Fusion
	2022-05-05
卷号	62
关键词	wide pedestal QH-mode pedestal stability turbulence spectrum BOUT++
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac4acf
通讯作者	Li,Zeyu()
英文摘要	Abstract The wide-pedestal quiescent high confinement mode discovered on DIII-D in recent years is a stationary and quiescent H-mode (QH-mode) with the pedestal width exceeding EPED prediction by at least 25%. Its characteristics, such as low rotation, high energy confinement and edge localized mode-free operation, make it an attractive operation mode for future reactors. Linear and nonlinear simulations using BOUT++ reduced two fluid MHD models and awere carried out to investigate the bursty broadband turbulence often observed in the edge of wide-pedestal QH-mode plasmas. Two kinds of MHD-scale instabilities in different spatial locations within the pedestal were found in the simulations: one mild peeling–ballooning (PB) mode (γ PB < 0.04ω A) located near the minimum in E r?well propagating in ion diamagnetic drift direction; and one drift-Alfvén wave locates at smaller radius compared to E r?well propagating in the electron diamagnetic drift direction and unstable only when the parallel electron dynamics is included in the simulation. The coupling between drift wave and shear Alfvén wave provides a possible cause of the experimentally observed local profile flattening in the upper-pedestal. The rotation direction, mode location, as well as the wavenumber of these two modes from BOUT++ simulations agree reasonably well with the experimental measurements, while the lack of quantitative agreement is likely due to the lack of trapped electron physics in current fluid model. This work presents improved physics understanding of the pedestal stability and turbulence dynamics for wide-pedestal QH-mode.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:NF_62_7_076033
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/129631]
专题	中国科学院合肥物质科学研究院
通讯作者	Li,Zeyu
作者单位	1.Electrical and Computer Engineering, University of California, Davis, CA 95616, United States of America 2.General Atomics, San Diego, CA 92121, United States of America 3.Lawrence Livermore National Laboratory, Livermore, CA 94550, United States of America 4.Physics and Astronomy Department, University of California, Los Angeles, CA 90095, United States of America 5.Princeton Plasma Physics Laboratory, Princeton, NJ 08543, United States of America 6.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China 7.University of Wisconsin-Madison, WI 53706, United States of America 8.Oak Ridge Associated Universities, Oak Ridge, TN 37831, United States of America
推荐引用方式 GB/T 7714	Li,Zeyu,Chen,Xi,Muscatello,C. M.,et al. Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D[J]. Nuclear Fusion,2022,62.
APA	Li,Zeyu.,Chen,Xi.,Muscatello,C. M..,Burrell,K.H..,Xu,Xueqiao.,...&DIII-D Team,.(2022).Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D.Nuclear Fusion,62.
MLA	Li,Zeyu,et al."Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D".Nuclear Fusion 62(2022).