Simulated effects of W dust ablation and deposition on the pedestal edge in JET D and DT experiments

E. Lazzaro, F. Causa, G. Gervasini, F. Ghezzi, D. Borodin, I. Borodkina, D. Douai, A. Huber, E. Pawelec, E. Solano, M. Sertoli, A. Widdowson

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish
Article number126037
JournalNuclear Fusion
Volume62
Issue number12
DOIs
StatePublished - 1 Dec 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© EURATOM 2022.

Funding

The authors are grateful to Dr. S. Nowak for help in checking input data. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200—EUROfusion). Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work was supported in part by the Italian Consiglio Nazionale delle Ricerche.

FundersFunder number
European Commission101052200—EUROfusion
Consiglio Nazionale delle Ricerche

    Keywords

    • H mode pedestal
    • W dust
    • ablation
    • penetration
    • separatrix

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