Journal
NUCLEAR FUSION
Volume 62, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1741-4326/ac9634
Keywords
W dust; separatrix; H mode pedestal; penetration; ablation
Categories
Funding
- European Union [101052200-EUROfusion]
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A modeling analysis is conducted to investigate the impact of W dust influx on the L-H-L mode transition in JET D and DT discharges. The study utilizes an upgraded version of the ballistic code DUSTTRACK and a new code PELLYTIX for dust ablation modeling. The results show that a reasonable amount of dust release does not have disastrous effects on high regime tokamak operation.
A modelling analysis is performed on JET D and DT discharges, where W dust influx across the separatrix, in the pedestal edge region may affect L-H-L mode transition. The experimental basis of the proposed approach stems from the observation that transient impurity events (TIEs) are often associated with the presence of a shower of particles seen in the camera images and with strong optical emission. If the localised source of radiation is a number of heated or ablated large dust particles, then the questions addressed here are: how far will the ablated dust material penetrate and what effect will this have on the edge of the pedestal in relevant JET D and in a high fusion yield D-T discharges. The methodology is based on the use of an upgraded version of the ballistic code DUSTTRACK and a new code PELLYTIX for dust ablation modelling. Considering a reasonable amount of dust released from the tiles, the analysis shows that the ablation-penetration depth is visible in the density profiles modification, but not disastrous for tokamak operation in high regimes.
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