The simulation of ELM control by the advanced divertor configuration in EAST

doi:10.1088/1741-4326/ada1e2

KMS

	The simulation of ELM control by the advanced divertor configuration in EAST
	Li, Y. L.1; Xia, T. Y.1; Luo, Z. P.1; Yu, Q. Z.2; Mao, S. F.3; Gui, B.1; He, X. X.1; Qi, H. M.1,3; Xie, P. C.1,3; Ye, M. Y.3; EAST team
	2025-02-01
发表期刊	NUCLEAR FUSION (IF:3.5[JCR-2023],3.4[5-Year])
ISSN	0029-5515
EISSN	1741-4326
卷号	65 期号:2
DOI	10.1088/1741-4326/ada1e2
摘要	Edge localized modes (ELMs) are effectively suppressed in the 'quasi-snowflake' (QSF) divertor discharges, which has been observed in the Experimental Advanced Superconducting Tokamak (EAST). To obtain the physical mechanism of ELM suppression, the numerical simulations are carried out using the BOUT++ turbulence model. The simulations reveal that the large local magnetic shear near the outer mid-plane (OMP) induced by QSF divertor plays a key role in the ELM suppression. Using the EFIT code, a series of plasma equilibria with different 2nd X-points and nearly fixed last closed flux surfaces (LCFSs) are generated to analyze the effects of the different magnetic configurations on ELMs. Here we mainly discuss the standard single-null (SN), snowflake plus (SF+), and snowflake minus (SF-) divertors. The simulation results indicate that: (1) for linear instability, compared to SN, SF+ is more unstable, while SF- is more stable. Essentially, the local magnetic shear formed by different divertor geometries can alter the growth rate of the peeling-ballooning (P-B) mode. Through statistical analysis, there is an inverse correlation between the strength of local magnetic shear and the growth rate of P-B mode; (2) for ELM energy loss, SN is 4.60%, SF+ is 7.50%, and SF- is 0.35%. The SF+ divertor triggers a larger ELM, which is consistent with the TCV experiments; while the SF- divertor reduces the ELM amplitude, which is similar to the QSF experiments in EAST. Further analysis shows that the Reynolds stress determines the ELM size under different divertor configurations. The Reynolds stress can redistribute energy to fluctuations and cause the growth of low-n modes. What's more, the SF- divertor not only suppresses the radial transport, but also has large magnetic flux expansion and connection length, which can reduce the target heat flux effectively. The conclusion of this paper shows that the advanced divertor configurations are promising for the future fusion.
关键词	ELM suppression QSF divertor magnetic configurations local magnetic shear the Reynolds stress magnetic flux expansion
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收录类别	SCI ; EI
语种	英语
资助项目	National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809["12347176","12175275","11975232"] ; National Natural Science Foundation of China[2019YFE03030004] ; National MCF Energy R&D Program of China["2023M733545","2023M743541"] ; China Postdoctoral Science Foundation[GZC20232714] ; Postdoctoral Fellowship Program of CPSF["YZJJ2023QN18","YZJJ2024QN26","YZJJ2024QN23"] ; CASHIPS Director's Found[2408085MA004] ; Anhui Provincial Natural Science Foundation[DSJJ-2023-01] ; Science Foundation of ASIPP[Y2021114] ; Youth Innovation Promotion Association Chinese Academy of Sciences[XDB0790102] ; Strategic Priority Research Program of Chinese Academy of Sciences[2021HSC-CIP018]
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:001390634100001
出版者	IOP Publishing Ltd
EI入藏号	20250217666314
EI主题词	Fusion reactor divertors
EI分类号	1001.1 Nuclear Power Plant Equipment and Operation ; 1001.2.2 Fusion Reactors ; 1301.2.3 Plasma Physics ; 301.1 Fluid Flow ; 301.1.5 Flow of Fluid-Like Materials ; 301.2.1 Magnetohydrodynamics ; 701.2 Magnetism: Basic Concepts and Phenomena ; 704.1 Electric Components ; 942.2 Miscellaneous Devices, Equipment and Components
原始文献类型	Journal article (JA)
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/470974
专题	上海科技大学
通讯作者	Xia, T. Y.; Ye, M. Y.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China 2.ShanghaiTech Univ, Ctr Ultimate Energy, Shanghai 201210, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei, Peoples R China
推荐引用方式 GB/T 7714	Li, Y. L.,Xia, T. Y.,Luo, Z. P.,et al. The simulation of ELM control by the advanced divertor configuration in EAST[J]. NUCLEAR FUSION,2025,65(2).
APA	Li, Y. L..,Xia, T. Y..,Luo, Z. P..,Yu, Q. Z..,Mao, S. F..,...&EAST team.(2025).The simulation of ELM control by the advanced divertor configuration in EAST.NUCLEAR FUSION,65(2).
MLA	Li, Y. L.,et al."The simulation of ELM control by the advanced divertor configuration in EAST".NUCLEAR FUSION 65.2(2025).