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The Deep Underground Neutrino Experiment (DUNE) is a dual-site experiment forlong baseline neutrino oscillation studies, and for neutrino astrophysics andnucleon decay searches. The far detector is a 40-kton underground liquid argontime-projection-chamber (LAr TPC), in which the photon detector system addsprecise timing capabilities. The ProtoDUNE dual phase detector will consist ofa 6x6x6 m^3 LAr TPC to be operated at the CERN Neutrino Platform and the photondetection system will be formed by 8-inch cryogenic photomultipliers fromHamamatsu. The PMT model (R5912-20Mod) performance at cryogenic temperature isstudied including dark current, gain, and linearity with the light intensityand pulse rate. In addition, the PMT base design is validated. At cold, adecrease of the PMT amplification, or fatigue effect, is measured as the PMToutput current increases, either, due to high gain, light intensity or rate.Also, the characterisation results of the 40 photomultipliers to be used inProtoDUNE dual phase are presented.

Cryogenic R5912-20Mod Photomultiplier Tube Characterization for the ProtoDUNE Dual Phase Detector