Progress on physics understanding of improved confinement with fishbone instability at low q (95) < 3.5 operation regime in EAST

doi:10.1088/1741-4326/ac97f3

	Progress on physics understanding of improved confinement with fishbone instability at low q (95) < 3.5 operation regime in EAST
	Zhang, B.2; Gong, X.2; Qian, J.2; Zeng, L.2; Xu, L. Q.2; Duan, Y. M.2; Zhang, J. Y.2,3; Hu, Y. C.2,3; Jia, T. Q.2,3; Li, P.2,3
刊名	NUCLEAR FUSION
	2022-12-01
卷号	62
关键词	confinement ITER baseline fishbone
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac97f3
通讯作者	Zhang, B.(binzhang@ipp.ac.cn) ; Qian, J.(jpqian@ipp.ac.cn)
英文摘要	Improved confinement at the low q (95) < 3.5 operation regime with fishbone instability compared to sawtooth oscillation has been observed and investigated on the EAST under the dominant electron heating condition with a tungsten divertor. The formation of an internal transport barrier in the ion thermal channel strongly correlates to the excitation of the fishbone, accompanied by reduced particle outward transport in the core region identified by a central peaked density profile. Current density distribution is found to change from a monotonic shape with q (0) < 1 during sawtooth oscillation to a central flat structure, magnetic shear s similar to 0 at rho < 0.4, with the fishbone instability at where the higher off-axis bootstrap current fraction might play a critical role. Linear gyrokinetic simulation by NLT code was carried out to investigate the turbulent transport characteristics, which is qualitatively in good agreement with experimental measurements from CO2 laser collective scattering diagnostics. The electron-scale trapped electron mode that dominates the turbulent transport during sawtooth is found to be stabilized with the fishbone at identical heating power and plasma configurations.
资助项目	National MCF Energy RD Program[2019YFE03040000] ; Users with Excellence Program of Hefei Science Center CAS[2021HSC-UE018] ; Users with Excellence Program of Hefei Science Center CAS[2020HSC-UE01] ; Science Foundation of Institute of Plasma Physics, the Chinese Academy of Sciences[DSJJ-2021-04] ; External Cooperation Program of the Chinese Academy of Sciences[116134KYSB20180035] ; National Natural Science Foundation of China[12005262]
WOS关键词	INTERNAL TRANSPORT BARRIER ; MODES ; KINK
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000883761100001
资助机构	National MCF Energy RD Program ; Users with Excellence Program of Hefei Science Center CAS ; Science Foundation of Institute of Plasma Physics, the Chinese Academy of Sciences ; External Cooperation Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130381]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, B.; Qian, J.
作者单位	1.Shenzhen Univ, Shenzhen, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Zhang, B.,Gong, X.,Qian, J.,et al. Progress on physics understanding of improved confinement with fishbone instability at low q (95) < 3.5 operation regime in EAST[J]. NUCLEAR FUSION,2022,62.
APA	Zhang, B..,Gong, X..,Qian, J..,Zeng, L..,Xu, L. Q..,...&East Team.(2022).Progress on physics understanding of improved confinement with fishbone instability at low q (95) < 3.5 operation regime in EAST.NUCLEAR FUSION,62.
MLA	Zhang, B.,et al."Progress on physics understanding of improved confinement with fishbone instability at low q (95) < 3.5 operation regime in EAST".NUCLEAR FUSION 62(2022).