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

作　　者：Zong Xu Zhen-Wei Wu Ling Zhang Yue-Heng Huang Wei Gao Yun-Xin Cheng Xiao-Dong Lin Xiang Gao Ying-Jie Chen Lei Li Yin-Xian Jie Qing Zang Hai-Qing Liu EAST team 许棕;吴振伟;张凌;黄跃恒;高伟;程云鑫;林晓东;高翔;陈颖杰;黎嫘;揭银先;臧庆;刘海庆;EAST team(Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,China;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;University of Science&Technology of China,Hefei 230031,China)

机构地区：[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

出　　处：《Chinese Physics B》2021年第7期345-354,共10页中国物理B（英文版）

基　　金：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);the Fund from the Shenzhen Clean Energy Research Institute,China。

摘　　要：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 coreτimp reduction and normalized poloidal beta(βP)^(im)provement.It should be emphasized that in this highβ_P operation window the small ELM regime can be accessed,and an L-mode levelτ_(imp)(40 ms-80 ms)and highβ_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.

关 键 词：LHW and ECRH heating impurity confinement time tungsten small ELMs regime EAST 

分 类 号：TL631.24[核科学技术—核技术及应用]