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Divertor detachment operation in helium plasmas with ITER-like tungsten divertor in EAST
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作者 Jianbin LIU Lingyi MENG +14 位作者 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 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第7期112-118,共7页
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 b... 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. 展开更多
关键词 divertor detachment helium plasma density threshold EAST
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