Video analysis of dust events in full-tungsten ASDEX Upgrade

F. Brochard; A. Shalpegin; S. Bardin; T. Lunt; V. Rohde; J. L. Brianç; G. Pautasso; C. Vorpahl; R. Neu

doi:10.1088/1741-4326/aa4e56

Video analysis of dust events in full-tungsten ASDEX Upgrade

F. Brochard, A. Shalpegin, S. Bardin, T. Lunt, V. Rohde, J. L. Brianç, G. Pautasso, C. Vorpahl, R. Neu

Associate Professorship of Plasma-Material-Wechselwirkung

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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.

Original language	English
Article number	036002
Journal	Nuclear Fusion
Volume	57
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/aa4e56
State	Published - Mar 2017

Keywords

dust
fast imaging
plasma wall interactions
thermonuclear fusion
tungsten tokamaks

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10.1088/1741-4326/aa4e56

Cite this

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title = "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 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.",

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AU - Brochard, F.

AU - Shalpegin, A.

AU - Bardin, S.

AU - Lunt, T.

AU - Rohde, V.

AU - Brianç, J. L.

AU - Pautasso, G.

AU - Vorpahl, C.

AU - Neu, R.

PY - 2017/3

Y1 - 2017/3

N2 - 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.

AB - 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.

KW - dust

KW - fast imaging

KW - plasma wall interactions

KW - thermonuclear fusion

KW - tungsten tokamaks

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Video analysis of dust events in full-tungsten ASDEX Upgrade

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Keywords

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