Study of heat load and radiation distributions in EAST upgraded divertor influenced by impurity injection positions.

Autor: Luo, Yang, Liu, Haifeng, Xu, Yuhong, Feng, Yuhe, Guo, Wenfeng, Dong, Chunfeng, Wang, Xianqu, Huang, Jie, Liu, Hai, Zhang, Xin, Su, Xiang, Xu, Junming, Li, Zhiru, Cheng, Jun, Tang, Changjian
Zdroj: European Physical Journal Plus; Jun2023, Vol. 138 Issue 6, p1-9, 9p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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