Divertor detachment operation in helium plasmas with ITER-like tungsten divertor in EAST  

作　　者：Jianbin LIU Lingyi MENG Houyang GUO Kedong LI Jichan XU Huiqian WANG Guosheng XU Fang DING Ling ZHANG Yanmin DUAN Bin ZHANG Lin YU Ping WANG Ang LI Donggui WU Rui DING Liang WANG 刘建斌;孟令义;郭后扬;李克栋;许吉禅;汪惠乾;徐国盛;丁芳;张凌;段艳敏;张斌;余林;汪平;李昂;吴东贵;丁锐;王亮(Institute of Plasma Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;University of Science and Technology of China,Hefei 230026,People's Republic of China;School of Mechanical Engineering,Anhui University of Science&Technology,Huainan 232001,People's Republic of China;General Atomics,San Diego,California 92186,United States of America;Institute of Energy,Hefei Comprehensive National Science Centre,Hefei 230031,People's Republic of China)

机构地区：[1]Institute of Plasma Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,People's Republic of China [2]University of Science and Technology of China,Hefei 230026,People's Republic of China [3]School of Mechanical Engineering,Anhui University of Science&Technology,Huainan 232001,People's Republic of China [4]General Atomics,San Diego,California 92186,United States of America [5]Institute of Energy,Hefei Comprehensive National Science Centre,Hefei 230031,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第7期112-118,共7页等离子体科学和技术（英文版）

基　　金：supported by the National Key Research and Development Program of China(Nos.2017YFA0301300,2017YFE0402500 and 2019YFE03030000);National Natural Science Foundation of China(Nos.11905255,12005004,12022511,U1867222 and U19A20113);the Institute of Energy,Hefei Comprehensive National Science Center(No.GXXT-2020-004);AHNSF(No.2008085QA38);the CASHIPS Director’s Fund(No.BJPY2019B01);the Key Research Program of Frontier Sciences of CAS(No.ZDBS-LY-SLH010)。

摘　　要：Detachment in helium(He)discharges has been achieved in the EAST superconducting tokamak equipped with an ITER-like tungsten divertor.This paper presents the experimental observations of divertor detachment achieved by increasing the plasma density in He discharges.During density ramp-up,the particle flux shows a clear rollover,while the electron temperature around the outer strike point is decreasing simultaneously.The divertor detachment also exhibits a significant difference from that observed in comparable deuterium(D)discharges.The density threshold of detachment in the He plasma is higher than that in the D plasma for the same heating power,and increases with the heating power.Moreover,detachment assisted with neon(Ne)seeding was also performed in L-and H-mode plasmas,pointing to the direction for reducing the density threshold of detachment in He operation.However,excessive Ne seeding causes confinement degradation during the divertor detachment phase.The precise feedback control of impurity seeding will be performed in EAST to improve the compatibility of core plasma performance with divertor detachment for future high heating power operations.

关 键 词：divertor detachment helium plasma density threshold EAST 

分 类 号：TL631.24[核科学技术—核技术及应用]