The measurement of late-pulses and after-pulses in the large area Hamamatsu R7081 photomultiplier with improved quantum-efficiency photocathode
In recent years, large underwater telescopes have been designed and realized to measure high energy neutrinos from astrophysical objects. Muon tracks produced by the neutrino interaction in the surrounding medium are reconstructed from the arrival time and the number of photo-electrons of the Cherenkov light measured by the Photomultiplier tubes (PMT) array of the detector. For a correct reconstruction procedure, both the scattering of the light in the water and the late and after pulses produced in the PMTs must be considered. In this paper we report on this latter effect which has been measured in our laboratory using a laser in the single photoelectron mode (SPE) on a Hamamatsu R7081MOD 10" PMT with a high quantum efficiency photocathode. The PMT voltage supply was set to provide the 1 photo-electron peak at 10 pC as during normal operation: in this condition we find that the late-pulse contribution is small but not negligible.