Numerical simulation of Li-pellet injection experiments for ELM-pacing in EAST

Gao, Fang; Sun, Jizhong; Sun, Zhuo; Zuo, Guizhong; Hu, Jiansheng; Loarte, A.; Bonnin, X.; Peng, Lei; Liu, Jinyuan

doi:10.1088/1741-4326/ab8340

Cited by 9 publications

(26 citation statements)

References 39 publications

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“…Compared with the previous study of Li pellets [22] the maximum perturbed pressure resulting from D pellets of the same size is obviously higher, although a D atom only contributes one electron whereas one Li atom contributes three electrons after it has been completely ionized. In Subsection 3.2 we found that increasing the injection velocity would reduce the strength of the density perturbation.…”

Section: Ablation Rates Of D and Li Pellets For Elm Triggeringcontrasting

confidence: 76%

“…( 1), the space-time varying density of the D atomic number can be evaluated by a method in Ref. [22], which is introduced in the following section.…”

Section: Simulation Details 21 Ablation Modelmentioning

confidence: 99%

“…In order to calculate the source term more accurately, v z should be the velocity of the particles in the neutral cloud just ablated, as discussed in Ref. [22].…”

Section: Simulation Setupmentioning

confidence: 99%

“…The profiles in this work can be used as input for advanced MHD models such as BOUT++ to analyze the plasma response in detail. [27] In previous work [22] on ELM triggering by Li pellets we found that the triggering rate depends strongly on the pellet size; the aim was to provide a density perturbation in the gradient region of the background plasma. The use of pellets for fueling requires efficient fueling deep inside the separatrix without causing unacceptable perturbation.…”

Section: Pellet Size and Injection Velocitymentioning

confidence: 99%

“…In this work, a modified dynamic neutral gas shield (DNGS) model [19] and edge plasma transport package SOLPS-ITER [20] were used to study the ablation of D pellets and the transport of D species in both atomic and ionic states with reference to the H-mode discharge experiment parameters in EAST. In previous works by Gao et al [21,22] the model was used to study the injection of Li pellets for ELM pacing, and a specific technique was developed to couple the data for the time-varying spatial distribution of neutral species evaluated from DNGS into SOLPS-ITER. The predicted trigger rates with different radii were in good agreement with those of the experiments.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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To understand the effect of injected deuterium (D) pellet on background plasma, the ablation of D pellet and the transport of D species in both atomic and ionic states in the EAST device are simulated by 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 the injection velocity, the atomic density in the SOL decreases evidently and the deposition time is relatively shortened. Possible effects for edge localized modes (ELMs) triggering by D and Li pellets are also discussed in this work. With the same pellet size and injection velocity, the maximal perturbation pressure caused by D pellet is obviously higher. It is found that the resulting maximal perturbed pressure is enhanced remarkably when the injection velocity reduces from 300 to 100 m/s for a Φ1.6 mm pellet, 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.

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Section: Ablation Rates Of D and Li Pellets For Elm Triggeringcontrasting

confidence: 76%

“…( 1), the space-time varying density of the D atomic number can be evaluated by a method in Ref. [22], which is introduced in the following section.…”

Section: Simulation Details 21 Ablation Modelmentioning

confidence: 99%

“…In order to calculate the source term more accurately, v z should be the velocity of the particles in the neutral cloud just ablated, as discussed in Ref. [22].…”

Section: Simulation Setupmentioning

confidence: 99%

Section: Pellet Size and Injection Velocitymentioning

confidence: 99%