The effects of dissolved methane upon liquid argon scintillation light
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Conrad_The effects.pdf
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Author(s)
Alexander, T.
Back, H. O.
Pordes, S.
Jones, Benjamin James Poyner
Collin, Gabriel Lewis
Conrad, Janet
Greene, A.
Katori, Teppei
Toups, Matthew
Date Issued
December 2013
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Citation
Jones, B J P, T Alexander, H O Back, G Collin, J M Conrad, A Greene, T Katori, S Pordes, and M Toups. “The Effects of Dissolved Methane Upon Liquid Argon Scintillation Light.” Journal of Instrumentation 8, no. 12 (December 23, 2013): P12015–P12015.
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Author's final manuscript
Abstract
In this paper we report on measurements of the effects of dissolved methane upon argon scintillation light. We monitor the light yield from an alpha source held 20 cm from a cryogenic photomultiplier tube (PMT) assembly as methane is injected into a high-purity liquid argon volume. We observe significant suppression of the scintillation light yield by dissolved methane at the 10 part per billion (ppb) level. By examining the late scintillation light time constant, we determine that this loss is caused by an absorption process and also see some evidence of methane-induced scintillation quenching at higher concentrations (50-100 ppb). Using a second PMT assembly we look for visible re-emission features from the dissolved methane which have been reported in gas-phase argon methane mixtures, and we find no evidence of visible re-emission from liquid-phase argon methane mixtures at concentrations between 10 ppb and 0.1%.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1088/1748-0221/8/12/p12015
