Sustained radiative divertor in high-performance grassy-ELM regime with metal wall towards long-pulse operation in EAST

doi:10.1016/j.nme.2020.100867

	Sustained radiative divertor in high-performance grassy-ELM regime with metal wall towards long-pulse operation in EAST
	Li, K. D.1,2; Xu, G. S.2; Yuan, Q. P.2; Wang, L.2; Yang, Z. S.2; Liu, J. B.2; Yang, Q. Q.2; Wu, K.2; Duan, Y. M.2; Xu, J. C.3
刊名	NUCLEAR MATERIALS AND ENERGY
	2021-03-01
卷号	26
关键词	Detachment feedback control Radiative divertor Grassy-ELM regime
DOI	10.1016/j.nme.2020.100867
通讯作者	Xu, G. S.(gsxu@ipp.ac.cn)
英文摘要	Simultaneous control of transient heat load induced by large-amplitude edge-localized modes (ELMs) and steady-state heat load on divertor targets under metal wall environment is crucial for steady-state operation of future tokamak fusion reactors, such as ITER and the China Fusion Engineering Test Reactor (CFETR). In the recent experiments, sustained partial energy detachment without confinement degradation has been achieved in the Experimental Advanced Superconducting Tokamak (EAST) in high-performance grassy-ELM H-mode with q(95) similar to 5.9 by a newly developed detachment feedback control scheme, in which we first used electron temperature (T-et) measured by divertor Langmuir probes to identify the onset of energy detachment, and then the system switched to the feedback control of total radiation power measured by absolute extreme ultraviolet (AXUV) system. T-et around the upper outer strike point was successfully maintained less than 8 eV with seeding of 80% Ne and 20% D-2 mixture from upper outer divertor, and the total radiation power was maintained similar to 1.4 MW, around 52% of injected power. There was no significant decrease of the plasma stored energy and H-98,H-y2 factor (similar to 1) over the entire detachment feedback control process. These experiment results demonstrate good compatibility of the high-performance grassy-ELM regime with radiative divertor. In order to confirm the compatibility in a wider range, stable partial energy detachment in grassy-ELM H-mode with relatively lower q(95) (similar to 5.4) was also achieved in EAST through the newly developed integrated-feedback-control technique. The new detachment feedback control without confinement degradation in grassy-ELM H-mode provides a candidate mode for EAST long-pulse operation in the future with well control of ELM-induced transient and steady heat fluxes on the divertor target.
资助项目	National Magnetic Confinement Fusion Energy R&D Program of China[2019YFE03030000] ; National Magnetic Confinement Fusion Energy R&D Program of China[2018YFE0303103] ; National Magnetic Confinement Fusion Energy R&D Program of China[2017YFE0301300] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11875287] ; National Natural Science Foundation of China[11575242] ; National Natural Science Foundation of China[U1867222] ; National Natural Science Foundation of China[11905255] ; National Natural Science Foundation of China[11705233] ; Chinese Scholarship Council[201706340013] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH001] ; AHNSF[1808085J07] ; CASHIPS Director's Fund[BJPY2019A01] ; K C Wond Education Foundation ; Special Research Assistant Funding of CAS ; Users with Excellence Project of Hefei Science Center CAS[2018HSC-UE008]
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000628782500010
资助机构	National Magnetic Confinement Fusion Energy R&D Program of China ; National Natural Science Foundation of China ; Chinese Scholarship Council ; Key Research Program of Frontier Sciences, CAS ; AHNSF ; CASHIPS Director's Fund ; K C Wond Education Foundation ; Special Research Assistant Funding of CAS ; Users with Excellence Project of Hefei Science Center CAS
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/121289]
专题	中国科学院合肥物质科学研究院
通讯作者	Xu, G. S.
作者单位	1.Univ Sci & Technol China, Sci Isl Branch, Grad Sch, Hefei 230031, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China 3.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China 4.Gen Atom, POB 85608, San Diego, CA 92186 USA
推荐引用方式 GB/T 7714	Li, K. D.,Xu, G. S.,Yuan, Q. P.,et al. Sustained radiative divertor in high-performance grassy-ELM regime with metal wall towards long-pulse operation in EAST[J]. NUCLEAR MATERIALS AND ENERGY,2021,26.
APA	Li, K. D..,Xu, G. S..,Yuan, Q. P..,Wang, L..,Yang, Z. S..,...&Wan, B. N..(2021).Sustained radiative divertor in high-performance grassy-ELM regime with metal wall towards long-pulse operation in EAST.NUCLEAR MATERIALS AND ENERGY,26.
MLA	Li, K. D.,et al."Sustained radiative divertor in high-performance grassy-ELM regime with metal wall towards long-pulse operation in EAST".NUCLEAR MATERIALS AND ENERGY 26(2021).