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Optical readout tracking detector concept using secondary scintillation from liquid argon generated by a thick gas electron multiplier

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Lightfoot, P. K., Barker, Gary John, Mavrokoridis, K., Ramachers, Y. and Spooner, N. J. C. (2009) Optical readout tracking detector concept using secondary scintillation from liquid argon generated by a thick gas electron multiplier. Journal of Instrumentation, Vol.4 . article no. P04002 . doi:10.1088/1748-0221/4/04/P04002

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Official URL: http://dx.doi.org/10.1088/1748-0221/4/04/P04002

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Abstract

For the first time secondary scintillation, generated within the holes of a thick gas electron multiplier (THGEM) immersed in liquid argon, has been observed and measured using a silicon photomultiplier device (SiPM).

250 electron-ion pairs, generated in liquid argon via the interaction of a 5.9 keV Fe-55 gamma source, were drifted under the influence of a 2.5 kV/cm field towards a 1.5 mm thickness THGEM, the local field sufficiently high to generate secondary scintillation light within the liquid as the charge traversed the central region of the THGEM hole. The resulting VUV light was incident on an immersed SiPM device coated in the waveshifter tetraphenyl butadiene (TPB), the emission spectrum peaked at 460 nm in the high quantum efficiency region of the device.

For a SiPM over-voltage of 1 V, a THGEM voltage of 9.91 kV, and a drift field of 2.5 kV/cm, a total of 62 +/- 20 photoelectrons were produced at the SiPM device per Fe-55 event, corresponding to an estimated gain of 150 +/- 66 photoelectrons per drifted electron.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Scintillators, Liquid scintillators, Calorimeters, Low temperature research, Liquid argon
Journal or Publication Title: Journal of Instrumentation
Publisher: Institute of Physics Publishing Ltd.
ISSN: 1748-0221
Official Date: April 2009
Dates:
DateEvent
April 2009Published
Volume: Vol.4
Number of Pages: 32
Page Range: article no. P04002
DOI: 10.1088/1748-0221/4/04/P04002
Status: Peer Reviewed
Publication Status: Published
Funder: SensL Technologies Ltd.

Data sourced from Thomson Reuters' Web of Knowledge

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