The simulation of ELMs mitigation by pedestal coherent mode in EAST using BOUT plus

doi:10.1088/1741-4326/ac5449

	The simulation of ELMs mitigation by pedestal coherent mode in EAST using BOUT plus
	Li, Y. L.1,2; Xia, T. Y.2; Zou, X. L.3; Zhou, C.1; Zhang, X. J.2; Zhu, Y. R.4; Tang, T. F.5; Mao, S. F.1; Gui, B.2; Huang, Y. Q.1,2
刊名	NUCLEAR FUSION
	2022-06-01
卷号	62
关键词	ELM mitigation nonlinear interaction phase coherence time (PCT) coherent mode (CM)
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac5449
通讯作者	Xia, T. Y.(xiaty@ipp.ac.cn) ; Ye, M. Y.(yemy@ustc.edu.cn)
英文摘要	A general phenomenon that the edge localized modes (ELMs) can be effectively mitigated with the enhanced coherent modes (CMs) has been observed on EAST. For this phenomenon, the experimental statistical analysis and electromagnetic (EM) simulations have been performed. There is a threshold value of the CM intensity in the experiments, which plays a key role in ELMs mitigation. Through the ELITE and conventional BOUT++ analysis, we found that when the insignificant ELM and enhanced CM co-exist, the pedestal is located in unstable P-B region and the ELM is relatively large. The simulation results only using the experimental profiles without considering other factors cannot reproduce the no significant ELM experiment. The CM enhances the edge turbulence, which can control ELMs. Therefore, the effects of CM are considered to explain the ELM mitigation. Modifying the three-field reduced model in BOUT++, an imposed perturbation is added as the CM. The simulation results indicate that: without the CM, the ELM size belongs to the relative large ELM region; after considering the CM, the ELM is mitigated and the energy loss is reduced by about 44.5%. Analysis shows that the CM enhances the three-wave nonlinear interactions in the pedestal and reduces the phase coherence time (PCT) between the pressure and potential, which lead the perturbation to tend to be 'multiple-mode' coupling. The competition of free energy between the multiple modes leads to the lack of obvious filament structures and the decreased energy loss. The above reveals that there is a competitive relationship between turbulence and ELMs, and the CM-enhanced turbulence can effectively reduce ELM energy loss. In addition, through the parameter scanning, there is a threshold of the amplitude A, which is consistent with the statistical results in the experiments.
资助项目	National Key R&D Program of China[2017YFE0301101] ; National Key R&D Program of China[2019YFE03030004] ; National Natural Science Foundation of China[12175275] ; National Natural Science Foundation of China[11975232] ; National Natural Science Foundation of China[11675217] ; Comprehensive Research Facility for Fusion Technology Program of China[2018-000052-73-01-001228] ; Collaborative Innovation Program of Hefei Science Center, CAS[2021HSCCIP018] ; Youth Innovation Promotion Association Chinese Academy of Sciences[Y2021114]
WOS关键词	DIGITAL BISPECTRAL ANALYSIS ; ASDEX ; CONFINEMENT ; REGIME
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000777836100001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Comprehensive Research Facility for Fusion Technology Program of China ; Collaborative Innovation Program of Hefei Science Center, CAS ; Youth Innovation Promotion Association Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/128651]
专题	中国科学院合肥物质科学研究院
通讯作者	Xia, T. Y.; Ye, M. Y.
作者单位	1.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China 3.CEA, IRFM, F-13108 St Paul Les Durance, France 4.Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China 5.Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
推荐引用方式 GB/T 7714	Li, Y. L.,Xia, T. Y.,Zou, X. L.,et al. The simulation of ELMs mitigation by pedestal coherent mode in EAST using BOUT plus[J]. NUCLEAR FUSION,2022,62.
APA	Li, Y. L..,Xia, T. Y..,Zou, X. L..,Zhou, C..,Zhang, X. J..,...&Ye, M. Y..(2022).The simulation of ELMs mitigation by pedestal coherent mode in EAST using BOUT plus.NUCLEAR FUSION,62.
MLA	Li, Y. L.,et al."The simulation of ELMs mitigation by pedestal coherent mode in EAST using BOUT plus".NUCLEAR FUSION 62(2022).