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Video analysis of dust events in full-tungsten ASDEX Upgrade

Abstract : Fast video data recorded during seven consecutive operation campaigns (2008-2012) in full-tungsten ASDEX Upgrade have been analyzed with an algorithm developped to automatically detect and track dust particles. A total of 2425 discharges have been analyzed, corresponding to 12204 seconds 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.
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Submitted on : Tuesday, July 10, 2018 - 11:17:49 AM
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F. Brochard, A. Shalpegin, S. Bardin, T. Lunt, V. Rohde, et al.. Video analysis of dust events in full-tungsten ASDEX Upgrade. Nuclear Fusion, IOP Publishing, 2017, 57 (3), ⟨10.1088/1741-4326/aa4e56⟩. ⟨hal-01834094⟩



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