Simulation of tungsten impurity transport by DIVIMP under different divertor magnetic configurations on HL-3  

作　　者：Qingrui ZHOU Yanjie ZHANG Chaofeng SANG Jiaxian LI Guoyao ZHENG Yilin WANG Yihan WU Dezhen WANG 周庆瑞;张彦杰;桑超峰;李佳鲜;郑国尧;王艺霖;吴亦晗;王德真(Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),School of Physics,Dalian University of Technology,Dalian 116024,People’s Republic of China;Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China)

机构地区：[1]Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),School of Physics,Dalian University of Technology,Dalian 116024,People’s Republic of China [2]Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第10期29-38,共10页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.12235002 and 12122503);National Key R&D Program of China(No.2018YFE0301101);Dalian Science&Technology Talents Program(No.2022RJ11);Xingliao Talent Project(No.XLYC2203182)。

摘　　要：Tungsten(W)accumulation in the core,depending on W generation and transport in the edge region,is a severe issue in fusion reactors.Compared to standard divertors(SDs),snowflake divertors(SFDs)can effectively suppress the heat flux,while the impact of magnetic configurations on W core accumulation remains unclear.In this study,the kinetic code DIVIMP combined with the SOLPS-ITER code is applied to investigate the effects of divertor magnetic configurations(SD versus SFD)on W accumulation during neon injection in HL-3.It is found that the W concentration in the core of the SFD is significantly higher than that of the SD with similar total W erosion flux.The reasons for this are:(1)W impurities in the core of the SFD mainly originate from the inner divertor,which has a short leg,and the source is close to the divertor entrance and upstream separatrix.Furthermore,the W ionization source(S_(W0))is much stronger,especially near the divertor entrance.(2)The region overlap of S_(W0)and F_(W,TOT)pointing upstream promote W accumulation in the core.Moreover,the influence of W source locations at the inner target on W transport in the SFD is investigated.Tungsten impurity in the core is mainly contributed by target erosion in the common flux region(CFR)away from the strike point.This is attributed to the fact that the W source at this location enhances the ionization source above the W ion stagnation point,which sequentially increases W penetration.Therefore,the suppression of far SOL inner target erosion can effectively prevent W impurities from accumulating in the core.

关 键 词：snowflake divertor neon seeding tungsten transport DIVIMP HL-3 

分 类 号：TL631.24[核科学技术—核技术及应用]