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.
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)
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。
