Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment
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1604.06895.pdf
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4.21 MB
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54a902a4f0b91177c00a62e4cc4bf48c
Author(s)
Conrad, Janet Marie
Spitz, Joshua B.
Terao, Kazuhiro
Date Issued
August 2016
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Citation
Abe, Y. et al. “Characterization of the Spontaneous Light Emission of the PMTs Used in the Double Chooz Experiment.” Journal of Instrumentation 11, 8 (August 2016): P08001–P08001 © 2016 IOP Publishing Ltd and Sissa Medialab
Version
Author's final manuscript
Abstract
During the commissioning of the first of the two detectors of the Double Chooz experiment, an unexpected and dominant background caused by the emission of light inside the optical volume has been observed. A specific study of the ensemble of phenomena called Light Noise has been carried out in-situ, and in an external laboratory, in order to characterize the signals and to identify the possible processes underlying the effect. Some mechanisms of instrumental noise originating from the PMTs were identified and it has been found that the leading one arises from the light emission localized on the photomultiplier base and produced by the combined effect of heat and high voltage across the transparent epoxy resin covering the electric components. The correlation of the rate and the amplitude of the signal with the temperature has been observed. For the first detector in operation the induced background has been mitigated using online and offline analysis selections based on timing and light pattern of the signals, while a modification of the photomultiplier assembly has been implemented for the second detector in order to blacken the PMT bases.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1088/1748-0221/11/08/P08001
