The Hamamatsu R5912-HQE photomultiplier-tube (PMT) is a novel high-quantum efficiency PMT. It is currently used in the DEAP-3600 dark matter detector and is of significant interest for future dark matter and neutrino experiments where high signal yields are needed. We report on the methods developed for in-situ characterization and monitoring of DEAP's 255 R5912-HQE PMTs. This includes a detailed discussion of typical measured single-photoelectron charge distributions, correlated noise (afterpulsing), dark noise, double, and late pulsing characteristics. The characterization is performed during the detector commissioning phase using laser light injected through a light diffusing sphere and during normal detector operation using LED light injected through optical fibres.

Afterpulsing, Dark matter detection, Dark noise, Hamamatsu R5912-HQE, Late and double pulsing, PMT, Single photoelectron charge distribution
Nuclear Inst. and Methods in Physics Research, A
Department of Physics

Amaudruz, P.-A. (P. A.), Batygov, M. (M.), Beltran, B. (B.), Bina, C.E. (C. E.), Bishop, D. (D.), Bonatt, J. (J.), … Zielinski, J. (J.). (2019). In-situ characterization of the Hamamatsu R5912-HQE photomultiplier tubes used in the DEAP-3600 experiment. Nuclear Inst. and Methods in Physics Research, A, 922, 373–384. doi:10.1016/j.nima.2018.12.058