Reduction of impurity confinement time by combined heating of LHW and ECRH in EAST
Zong Xu(许棕)1,2, Zhen-Wei Wu(吴振伟)3,†, Ling Zhang(张凌)3,‡, Yue-Heng Huang(黄跃恒)1,2, Wei Gao(高伟)3, Yun-Xin Cheng(程云鑫)3,4, Xiao-Dong Lin(林晓东)1,2, Xiang Gao(高翔)1,2,3, Ying-Jie Chen(陈颖杰)3, Lei Li(黎嫘)3,4, Yin-Xian Jie(揭银先)1,2,3, Qing Zang(臧庆)1,2,3, Hai-Qing Liu(刘海庆)3, and EAST team3
1 Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China; 2 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China; 3 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China; 4 University of Science & Technology of China, Hefei 230031, China
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 (τimp) 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 τimp reduction and normalized poloidal beta (βP) improvement. It should be emphasized that in this high βP operation window the small ELM regime can be accessed, and an L-mode level τimp (40 ms-80 ms) and high βN (～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.
(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.
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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