Photomultiplier Tubes in the MiniBooNE Experiment
S. J. Brice, L. Bugel, J. M. Conrad, B. Fleming, L. Gladstone, E., Hawker, P. Killewald, J. May, S. McKenney, P. Nienaber, B. Roe, V. Sandberg,, D. Smith, M. Wysocki
TL;DR
This paper details the testing, characterization, and risk analysis of photomultiplier tubes used in the MiniBooNE detector to optimize performance and assess safety risks after a similar incident at Super-Kamiokande.
Contribution
It provides comprehensive testing procedures, response characterization, and safety risk assessment for photomultiplier tubes in a neutrino detection experiment.
Findings
Photomultiplier tubes were characterized for dark rate, charge, and timing resolutions.
Angular dependence of phototube response was measured.
Risk analysis indicated the likelihood of a similar implosion accident.
Abstract
The detector for the MiniBooNE experiment at the Fermi National Accelerator Laboratory employs 1520 8 inch Hamamatsu models R1408 and R5912 photomultiplier tubes with custom-designed bases. Tests were performed to determine the dark rate, charge and timing resolutions, double-pulsing rate, and desired operating voltage for each tube, so that the tubes could be sorted for optimal placement in the detector. Seven phototubes were tested to find the angular dependence of their response. After the Super-K phototube implosion accident, an analysis was performed to determine the risk of a similar accident with MiniBooNE.
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