Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge
Wan-Ting Chen(陈婉婷), Ji-Zhong Sun(孙继忠)†, Fang Gao(高放), Lei Peng(彭磊), and De-Zhen Wang(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, China
Abstract To understand the effect of injected deuterium (D) pellets on background plasma, the ablation of D pellets and the transport of D species in both atomic and ionic states in the EAST device are simulated using a modified dynamic neutral gas shield model combined with the edge plasma code SOLPS-ITER. The simulation results show that there is a phenomenon of obvious atomic deposition in the scrape-off layer (SOL) after pellet injection, which depends strongly on the injection velocity. With increasing injection velocity, the atomic density in the SOL decreases evidently and the deposition time is relatively shortened. Possible effects for triggering of edge localized modes (ELMs) by D and Li pellets are also discussed. With the same pellet size and injection velocity, the maximum perturbation pressure caused by D pellets is obviously higher. It is found that the resulting maximum perturbed pressure is remarkably enhanced when the injection velocity is reduced from 300 m/s to 100 m/s for a pellet with a cross section of 1.6 mm, which indicates that the injection velocity is important for ELM pacing. This work can provide reasonable guidance for choosing pellet parameters for fueling and ELM triggering.
Fund: Project supported by the National Key R&D Program of China under Grant Nos. 2017YFE0301100 and 2019YFE03030004, the National Natural Science Foundation of China under Grant No. 11575039, and Users with Excellence Program of Hefei Science Center CAS (2020HSCUE010).
Corresponding Authors:
Ji-Zhong Sun
E-mail: jsun@dlut.edu.cn
Cite this article:
Wan-Ting Chen(陈婉婷), Ji-Zhong Sun(孙继忠), Fang Gao(高放), Lei Peng(彭磊), and De-Zhen Wang(王德真) Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge 2022 Chin. Phys. B 31 075204
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