Experimental investigation on divertor tungsten sputtering with neon seeding in ELMy H-mode plasma in EAST tokamak  

作　　者：Dawei Ye Fang Ding Kedong Li Zhenhua Hu Ling Zhang Xiahua Chen Qing Zhang Pingan Zhao Tao He Lingyi Meng Kaixuan Ye Fubin Zhong Yanmin Duan Rui Ding Liang Wang Guosheng Xu Guangnan Luo EAST team 叶大为;丁芳;李克栋;胡振华;张凌;陈夏华;张青;赵平安;贺涛;孟令义;叶凯萱;钟富彬;段艳敏;丁锐;王亮;徐国盛;罗广南;EAST team(Institute of Plasma Physics,HFIPS,Chinese Academy of Sciences(CAS),Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Institute of Plasma Physics,HFIPS,Chinese Academy of Sciences(CAS),Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2022年第6期512-517,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 Nos.2017YFE0301300,2017YFA0402500,and 2018YFE0303103);the National Natural Science Foundation of China(Grant Nos.12192283 and 12022511);the Users with Excellence Project of Hefei Science Center,CAS(Grant No.2018HSC-UE008);the CASHIPS Director’s Fund(Grant No.BJPY2019B01);the JSPS-CAS Bilateral Joint Research Project(Grant No.GJHZ201984);the Key Research Program of Frontier Sciences of CAS(Grant No.ZDBS-LY-SLH010)。

摘　　要：Neon(Ne)seeding is used to cool the edge plasma by radiation to protect the divertor tungsten(W)target in the Experimental Advanced Superconducting Tokamak(EAST).The W sputtering in the outer divertor target with Ne seeding is assessed by the divertor visible spectroscopy system.It is observed that the W sputtering flux initially increases with Ne concentration in the divertor despite the decreasing plasma temperature.After reaching a maximum around 25 eV,the W sputtering rate starts to decrease,presenting a suppression effect.The effect on the divertor W sputtering flux and yield due to the competition between the increase of the Ne concentration and the decrease of the plasma temperature is discussed.The results show that enough Ne seeding is essential to effectively reduce the electron temperature and thus to suppress W sputtering.Moreover,ELM suppression is observed when Ne and W impurities enter the core plasma,which could be correlated to the enhanced turbulence transport in the pedestal.

关 键 词：neon seeding tungsten sputtering ELM suppression EAST tokamak 

分 类 号：TL631.24[核科学技术—核技术及应用] TL612