https://doi.org/10.1140/epjp/s13360-025-06748-5
Regular Article
3D effects of nitrogen seeding positions on toroidal asymmetry of SOL plasma transport and deposition on CFETR X-divertor
1
School of Arts and Science, Northeast Agricultural University, 150030, Harbin, China
2
School of Electrical and Information, Northeast Agricultural University, 150030, Harbin, China
3
College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, China
4
Institute of Plasma Physics, Chinese Academy of Sciences, 230031, Hefei, China
5
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, 116024, Dalian, China
a
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b
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Received:
4
April
2025
Accepted:
8
August
2025
Published online:
24
August
2025
The poloidally and toroidally localized nitrogen-14 (14N) injection on CFETR X-divertor configuration has been studied using the three-dimensional (3D) Monte Carlo transport code EMC3-EIRENE. It provides a good route to elucidate the impact of several 14N seeding positions (i.e., two upstream SOL regions and two downstream divertor regions) on the toroidal asymmetry of scrape-off layer (SOL) plasma transport and deposition behaviors. The strong asymmetry of electron density and temperature distribution is observed when 14N impurities are injected at upstream SOL regions. It results from the toroidally connected spiral-like structures of strong power dissipation caused by peak 14N impurities density, following from the source positions down to the divertor region. The 14N seeding at downstream divertor regions gives rise to the occurrence of symmetric electron density and temperature profiles in the toroidal direction. The deposition pattern of 14N ions on divertor plates has been calculated to evaluate the 3D cooling effect on the divertor plasma by scanning various 14N injection positions. The 14N injected at upstream SOL regions induces several stripe-like structures of peak 14N ion deposition on divertor targets. It turns out to be the strong 3D radiative cooling effect on divertor plasmas. The island-like structures of peak 14N ion deposition on divertor targets show a weak cooling effect localized around the injection positions.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
