In Situ Characterization of Dust Mobilized by Laser Cleaning Methods and Loss of Vacuum Accidents

We investigate the ability of light extinction spectrometry (LES) to characterize, at long distances, the size distribution and concentration of dust mobilized by laser cleaning methods (ITER wall detritiation and characterization of deposition layers) or by experiments dealing with a loss-of-vacuum...

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Published inFusion science and technology Vol. 62; no. 1; pp. 39 - 45
Main Authors Onofri, F. R. A., Barbosa, S., Wozniak, M., Mroczka, J., Vrel, D., Grisolia, C.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.08.2012
Subjects
Accidents
Broadband
Cleaning
Dealing
Dust
Lasers
Physics
Tungsten
Walls
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Summary:We investigate the ability of light extinction spectrometry (LES) to characterize, at long distances, the size distribution and concentration of dust mobilized by laser cleaning methods (ITER wall detritiation and characterization of deposition layers) or by experiments dealing with a loss-of-vacuum accident. Potentially harmful effects induced by wall proximity, plasma plume broadband emission, and associated shock waves are shown to have a negligible influence on LES measurements, which demonstrates the interest in this optical technique for the aforementioned studies. However, our experimental results, based on aerosols of silica and tungsten powder aggregates, show that the present setup allows the characterization of dust volume fractions of less than [approximately equal]1-10 ppb for a probing length of 1 m (or by extrapolation [approximately equal]0.1-1 ppb for a probing length of 10 m).
Bibliography:ObjectType-Article-2
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ISSN:1536-1055
1943-7641
DOI:10.13182/FST12-A14109