Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

doi:10.1088/1674-1056/abe1a6

Abstract The core impurity confinement properties are experimentally investigated in the Experimental Advanced Superconducting Tokamak (EAST) plasma heated by lower hybrid wave (LHW) and electron cyclotron resonance heating (ECRH) (LHW+ECRH). It is shown that the impurity confinement time (τ_imp) in the L-mode plasma jointly heated by LHW and ECRH is weakly dependent on electron density but strongly dependent on the heating power, thus it is shorter than that in LHW-only heated L-mode plasma with the similar plasma parameters. The combined heating of LHW and ECRH can reduce the collisionality and indicates a more effective heating method for core τ_imp reduction and normalized poloidal beta (β_P) improvement. It should be emphasized that in this high β_P operation window the small ELM regime can be accessed, and an L-mode level τ_imp (40 ms-80 ms) and high β_N (～1.7) can be obtained simultaneously. It means that this typical small ELMy H-mode regime has an advantage in avoiding the serious tungsten accumulation, and will be competitive in future long-pulse steady-state and high-performance operation with high-Z material plasma-facing components.

Keywords: LHW and ECRH heating impurity confinement time tungsten small ELMs regime EAST

Received: 31 October 2020
Revised: 27 January 2021
Accepted manuscript online: 01 February 2021

PACS:	52.25.Fi	(Transport properties)
	52.35.Ra	(Plasma turbulence)
	52.25.Vy	(Impurities in plasmas)
	52.20.Hv	(Atomic, molecular, ion, and heavy-particle collisions)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFE031110 and 2017YFE0301205), the National Natural Science Foundation of China (Grant Nos. 11905146, 11775269, and 11805113), the Users with Excellence Program of Hefei Science Center, Chinese Academy of Sciences (Grant No. 2019HSC-UE014), and the Fund from the Shenzhen Clean Energy Research Institute, China.

Corresponding Authors: Zhen-Wei Wu, Ling Zhang
E-mail: zwwu@ipp.ac.cn;zhangling@ipp.ac.cn

Cite this article:

Zong Xu(许棕), Zhen-Wei Wu(吴振伟), Ling Zhang(张凌), Yue-Heng Huang(黄跃恒), Wei Gao(高伟), Yun-Xin Cheng(程云鑫), Xiao-Dong Lin(林晓东), Xiang Gao(高翔), Ying-Jie Chen(陈颖杰), Lei Li(黎嫘), Yin-Xian Jie(揭银先), Qing Zang(臧庆), Hai-Qing Liu(刘海庆), and EAST team Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST 2021 Chin. Phys. B 30 075205

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Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST

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