Video analysis of dust events in full-tungsten ASDEX Upgrade

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 operati...

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Bibliographic Details
Published inNuclear fusion Vol. 57; no. 3; pp. 36002 - 36014
Main Authors Brochard, F., Shalpegin, A., Bardin, S., Lunt, T., Rohde, V., Briançon, J.L., Pautasso, G., Vorpahl, C., Neu, R.
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.03.2017
Subjects
dust
Engineering Sciences
fast imaging
Nuclear Experiment
Physics
plasma wall interactions
Plasmas
thermonuclear fusion
tungsten tokamaks
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Summary: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.
Bibliography:International Atomic Energy Agency
NF-101289.R3
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/aa4e56