Prediction of the energetic particle redistribution by an improved critical gradient model and analysis of the transport threshold

doi:10.1063/5.0078098

	Prediction of the energetic particle redistribution by an improved critical gradient model and analysis of the transport threshold
	Zou, Y.2; Chan, V. S.1,3; Van Zeeland, M. A.1; Heidbrink, W. W.4; Todo, Y.5,6; Chen, Wei 2; Wang, Y.2; Chen, J.7
刊名	PHYSICS OF PLASMAS
	2022-03-01
卷号	29
ISSN号	1070-664X
DOI	10.1063/5.0078098
通讯作者	Chan, V. S.(chanvs@ustc.edu.cn)
英文摘要	Based on the theory of critical gradient model (CGM) and following the simulation method proposed by Waltz et al. [Nucl. Fusion 55, 123012 (2015)], a combination of TGLFEP and EPtran code is employed to predict the energetic particle (EP) transport induced by Alfven eigenmodes (AEs). To be consistent with the experiment, recent improvements to the simulation method include consideration of threshold evolution and orbit loss due to finite orbit width. The revised CGM is applied to simulate two DIII-D experimental discharges (#142111 and #153071). It well reproduces the experimental profiles with multiple unstable AEs and large-scale EP transport. Discharge #142111 had previously been simulated using a nonlinear MHD-kinetic code MEGA [Todo et al., Nucl. Fusion 55, 073020 (2015)] with a transport mechanism based on stochasticity induced by overlapping AE. By comparing the simulated EP profiles, we find that the AE transport threshold is approximated by both the MEGA nonlinear stability threshold and the proposed CGM threshold (error <5% for single n and <17% for multiple n simulation). Both of them are larger than the linear stability threshold of the most unstable AE mode by a quantity of the order of the flux needed to sustain EP transport by the background turbulence. We have also applied the improved CGM to simulate the alpha particle redistribution for a China Fusion Engineering Test Reactor steady state scenario. Because of the clear separation between the AE unstable region and the loss cone, only a moderate alpha particle loss of similar to 9.6% is predicted. Published under an exclusive license by AIP Publishing.
资助项目	National Magnetic Confinement Fusion Program of China[142111] ; National Magnetic Confinement Fusion Program of China[153071] ; National Natural Science Foundation of China[2019YFE03020000] ; National Natural Science Foundation of China[2017YFE0300500] ; National Natural Science Foundation of China[2017YFE0300501] ; U.S. DOE Office of Fusion Energy Science[12105084] ; U.S. DOE Office of Fusion Energy Science[12175053] ; [DE-SC0017992] ; [DE-FC02-04ER54698]
WOS关键词	ALFVEN EIGENMODES ; STABILITY ; PLASMAS
WOS研究方向	Physics
语种	英语
出版者	AIP Publishing
WOS记录号	WOS:000874728300002
资助机构	National Magnetic Confinement Fusion Program of China ; National Natural Science Foundation of China ; U.S. DOE Office of Fusion Energy Science
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130007]
专题	中国科学院合肥物质科学研究院
通讯作者	Chan, V. S.
作者单位	1.Gen Atom, POB 85608, San Diego, CA 92186 USA 2.Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Peoples R China 4.Univ Calif Irvine, Irvine, CA 92697 USA 5.Natl Inst Fus Sci, Toki, Gifu 5095292, Japan 6.SOKENDAI Grad Univ Adv Studies, Dept Fus Sci, Toki, Gifu 5095292, Japan 7.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zou, Y.,Chan, V. S.,Van Zeeland, M. A.,et al. Prediction of the energetic particle redistribution by an improved critical gradient model and analysis of the transport threshold[J]. PHYSICS OF PLASMAS,2022,29.
APA	Zou, Y..,Chan, V. S..,Van Zeeland, M. A..,Heidbrink, W. W..,Todo, Y..,...&Chen, J..(2022).Prediction of the energetic particle redistribution by an improved critical gradient model and analysis of the transport threshold.PHYSICS OF PLASMAS,29.
MLA	Zou, Y.,et al."Prediction of the energetic particle redistribution by an improved critical gradient model and analysis of the transport threshold".PHYSICS OF PLASMAS 29(2022).