A new generation photodetector for astroparticle physics: the VSiPMT

Abstract The VSiPMT (Vacuum Silicon PhotoMultiplierTube) is an innovative design we proposed for a revolutionary photon detector. The main idea is to replace the classical dynodechain of a PMT with a SiPM (G- APD), the latter acting as an electron detector and amplifier. The aim is to match the large sensitive area of a photocathodewith the performance of the SiPM technology. The VSiPMT has many attractive features. In particular, a low power consumption and an excellent photon countingcapability. To prove the feasibility of the idea we first tested the performance of a special non-windowed SiPM by Hamamatsu (MPPC) as electron detector and current amplifier. Thanks to this result Hamamatsu realized two VSiPMT industrial prototypes. In this work, we present the results of a full characterization of the VSiPMT prototype.