Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST  

作　　者：Yu-Qiang Tao Guo-Sheng Xu Ling-Yi Meng Rui-Rong Liang Lin Yu Xiang Liu Ning Yan Qing-Quan Yang Xin Lin Liang Wang 陶余强;徐国盛;孟令义;梁瑞荣;余林;刘祥;颜宁;杨清泉;林新;王亮(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China)

机构地区：[1]Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China [3]Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China

出　　处：《Chinese Physics B》2022年第6期529-534,共6页中国物理B（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2017YFE0301300);the National Natural Science Foundation of China(Grant Nos.12005257,12005004,11905143,and 11922513);the Fund from the Institute of Energy,Hefei Comprehensive National Science Center(Grant No.GXXT-2020-004);the CASHIPS Director’s Fund(Grant Nos.BJPY2019A01 and YZJJ2020QN13);the Special Research Assistant Funding of CAS and China Postdoctoral Science Foundation(Grant No.2020M671913);Anhui Provincial Natural Science Foundation(Grant No.2008085QA38)。

摘　　要：A series of L-mode discharges have been conducted in the new‘corner slot’divertor on the Experimental Advanced Superconducting Tokamak(EAST)to study the divertor plasma behavior through sweeping strike point.The plasma control system controls the strike point sweeping from the horizontal target to the vertical target through poloidal field coils,with keeping the main plasma stability.The surface temperature of the divertor target cools down as the strike point moves away,indicating that sweeping strike point mitigates the heat load.To avoid the negative effect of probe tip damage,a method based on sweeping strike point is used to get the normalized profile and study the decay length of particle and heat flux on the divertor target λ_(js),_λ(q).In the discharges with high radio-frequency(RF)heating power,electron temperature T_(e) is lower and λ_(js)is larger when the strike point locates on the horizontal target compared to the vertical target,probably due to the corner effect.In the Ohmic discharges,λ_(js),λ_(q) are much larger compared to the discharges with high RF heating power,which may be attributed to lower edge T_(e).

关 键 词：EAST tokamak divertor plasma sweeping strike point decay length 

分 类 号：TL631.24[核科学技术—核技术及应用]