https://doi.org/10.1140/epjp/s13360-023-04199-4
Regular Article
Study of heat load and radiation distributions in EAST upgraded divertor influenced by impurity injection positions
1
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, 610031, Chengdu, China
2
Max-Planck-Institute für Plasmaphysik, Association EURATOM-IPP, 17491, Greifswald, Germany
3
Institute of Plasma Physics, Chinese Academy of Sciences, 230031, Hefei, China
4
Southwestern Institute of Physics, PO Box 432, 610041, Chengdu, People’s Republic of China
5
School of Physical Science and Technology, Sichuan University, 610065, Chengdu, China
b
hfliu@swjtu.edu.cn
c
xuyuhong@swjtu.edu.cn
Received:
18
July
2022
Accepted:
16
June
2023
Published online:
30
June
2023
The power depositions on EAST upgraded divertor plates effected by impurity injection positions are studied numerically by the 3D edge transport code EMC3-EIRENE. It is found that the toroidal widening of the non-axisymmetric heat fluxes reaches a maximum though differing for the individual radial injection positions of carbon (methane), nitrogen and neon. Line average of friction force and ion thermal gradient force along the magnetic field lines has been calculated to reveal the correlation between the non-axisymmetric heat loads on the target plates and the distributions of the radiation power density. The results illustrate that when impurities are injected away from the separatrix with the high scrape-off layer input power, the radiation power density is locally low but the total radiation power is significant. The reason is that the toroidal-symmetry-breaking distribution of electron temperature gives rise to the expanding diffusion of impurity density and radiation power density, which reduces the heat flux deposited on the divertor plates.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. 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.
