Tungsten control in type-I ELMy H-mode plasmas on EAST

作     者：Zong Xu Zhen-Wei Wu Ling Zhang Yun-Xing Cheng Wei Gao Xiao-Dong Lin Xiang Gao Ying-Jie Chen Yue-Heng Huang Juan Huang Qing Zang Yin-Xian Jie Yan-Min Duan Ying-Ying Li Hai-Qing Liu Guo-Sheng Xu EAST team Zong Xu;Zhen-Wei Wu;Ling Zhang;Yun-Xing Cheng;Wei Gao;Xiao-Dong Lin;Xiang Gao;Ying-Jie Chen;Yue-Heng Huang;Juan Huang;Qing Zang;Yin-Xian Jie;Yan-Min Duan;Ying-Ying Li;Hai-Qing Liu;Guo-Sheng Xu;EAST team

作者机构：Advanced Energy Research CenterShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Institute of Plasma PhysicsChinese Academy of ScienceHefei 230031China University of Science&Technology of ChinaHefei 230031China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2021年第32卷第9期

页      面：61-72页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：supported by the National Key R&D Program of China(Nos.2018YFE0311100 and 2017YFE0301205) National Natural Science Foundation of China(Nos.11905146,11775269,11575244,11575249,11575235,11422546,11805133,and U19A20113) Users with Excellence Program of Hefei Science Center,CAS(No.2019HSC-UE014) National Magnetic Confinement Fusion Science Program of China(Nos.2015GB110005,2015GB103003,2015GB101002,and 2015GB103000) Key Research Program of Frontier Sciences,CAS(No.QYZDB-SSWSLH001) CASHIPS Director’s Fund(No.BJPY2019A01) Shenzhen Clean Energy Research Institute 

主　　题：Tungsten accumulation Counter-NBI Favorable B_(t)ELMy H-mode EAST 

摘      要：The first experimental investigation of the tungsten behavior in ELMy H-mode plasmas with co-/counter neutral beam injection(NBI)and unfavor-able/favorable B t was performed on *** was found to accumulate easily in ELMy H-mode plasma with co-NBI heating and unfavorable B ***,in this case the tungsten concentration can exceed 10^(-4),resulting in degradation of the plasma confinement and periodic H–L *** reduce the tungsten concentration in steady-state type-I ELMy H-mode operation,counter-NBI is applied to modify the density and temperature and brake the plasma toroidal *** applied counter-NBI decreases the PHZ+E_(r) inward pinch velocity and rever-ses the direction of neoclassical inward convection,thus decreasing the tungsten concentration from-7×10^(-5) to-2×10^(-5) in type-I ELMy H-mode plasma with favorable B_(t).A comparison of the effects of different B_(t) directions on the tungsten behavior also shows that favor-able B_(t) is beneficial for reducing the tungsten concentration in the core *** results imply that counter-NBI with favorable B_(t) can effectively prevent tungsten accu-mulation and expand the operating window for exploring steady-state type-I ELMy H-mode operation of EAST.