Cryogenic electronics for photosensors operating in liquid xenon

Abstract We present the performances and characterization of the cryogenic readout for an array made of Hamamatsu S13370-3050CN (VUV4 generation) Multi-Pixel Photon Counters (MPPC) operated at liquid xenon conditions. The electronics is designed to readout a maximum 64 individual VUV4 photosensors and it is based on the Analog Devices AD8011 current feedback operational amplifier. The AD8011 has been also selected for the realization of a preamplifier embedded onto a voltage divider base for the operation of Hamamatsu R11410 photo multiplier tubes. Results from the radio-purity screening of the AD8011 are also reported.