Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge

doi:10.1088/1674-1056/ac5c35

中国物理B ›› 2022, Vol. 31 ›› Issue (7): 75204-075204.doi: 10.1088/1674-1056/ac5c35

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

收稿日期:2021-12-20 修回日期:2022-02-27 接受日期:2022-03-10 出版日期:2022-06-09 发布日期:2022-07-01
通讯作者: Ji-Zhong Sun E-mail:jsun@dlut.edu.cn
基金资助:
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).

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

Received:2021-12-20 Revised:2022-02-27 Accepted:2022-03-10 Online:2022-06-09 Published:2022-07-01
Contact: Ji-Zhong Sun E-mail:jsun@dlut.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: deuterium pellet, fueling, EAST, SOLPS-ITER

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.

Key words: deuterium pellet, fueling, EAST, SOLPS-ITER

中图分类号: (Plasma simulation)

52.65.-y

52.55.Dy (General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.) 52.55.Fa (Tokamaks, spherical tokamaks)

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[J]. 中国物理B, 2022, 31(7): 75204-075204.

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Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge

Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge

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