Video analysis of dust events in full-tungsten ASDEX Upgrade

TitleVideo analysis of dust events in full-tungsten ASDEX Upgrade
Publication TypeJournal Article
Year of Publication2017
AuthorsF. Brochard, A. Shalpegin, S. Bardin, T. Lunt, V. Rohde, J.L Briançon, G. Pautasso, C. Vorpahl, R. Neu, ASDEX Upgrade Team
JournalNuclear Fusion
Volume57
Issue3
Pagination036002
Abstract

Fast video data recorded during seven consecutive operation campaigns (2008–2012) in full-tungsten ASDEX Upgrade have been analyzed with an algorithm developed to automatically detect and track dust particles. A total of 2425 discharges have been analyzed, corresponding to 12 204 s of plasma operation. The analysis aimed at precisely identifying and sorting the discharge conditions responsible of the dust generation or remobilization. Dust rates are found to be significantly lower than in tokamaks with carbon PFCs. Significant dust events occur mostly during off-normal plasma phases such as disruptions and particularly those preceded by vertical displacement events (VDEs). Dust rates are also increased but to a lower extent during type-I ELMy H-modes. The influences of disruption energy, heating scenario, vessel venting and vessel vibrations are also presented.

DOI10.1088/1741-4326/aa4e56
Division

PSI

Department

PMI

PID

ed5d85b4fd4c48439d8c98212f5b8c3a

Alternate TitleNucl. Fusion

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