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

Qingrui ZHOU; Yanjie ZHANG; Chaofeng SANG; Jiaxian LI; Guoyao ZHENG; Yilin WANG; Yihan WU; Dezhen WANG

doi:10.1088/2058-6272/ad6817

Plasma Science and Technology > 2024 > 26(10): 104003. > DOI: 10.1088/2058-6272/ad6817

Qingrui ZHOU, Yanjie ZHANG, Chaofeng SANG, Jiaxian LI, Guoyao ZHENG, Yilin WANG, Yihan WU, Dezhen WANG. Simulation of tungsten impurity transport by DIVIMP under different divertor magnetic configurations on HL-3[J]. Plasma Science and Technology, 2024, 26(10): 104003. DOI: 10.1088/2058-6272/ad6817

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

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

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Author Bio:
Chaofeng SANG: sang@dlut.edu.cn
Corresponding author:
Chaofeng SANG, sang@dlut.edu.cn
Received Date: February 21, 2024
Revised Date: July 24, 2024
Accepted Date: July 25, 2024
Available Online: July 26, 2024
Published Date: September 08, 2024

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Abstract

Abstract

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 ${F}_{\mathrm{W},\mathrm{T}\mathrm{O}\mathrm{T}}$ 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.
- snowflake divertor,
- neon seeding,
- tungsten transport,
- DIVIMP,
- HL-3

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Acknowledgments

This work was 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), and Xingliao Talent Project (No. XLYC2203182).

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