Using two-photon statistical contribution in the detection of telescopes EUSO

Abstract The Extreme Universe Space Observatory onboard Japanese Experiment Module (JEM-EUSO) is the future space observatory will be installed on the International Space Station (ISS) to study the comic rays of ultra high energy (UHECR). The Photo detector module (PDM) of telescope (JEM-EUSO) is characterized by high sensitivity detection that allows you to detect single photons of UV backgraund. The telescope EUSO-Balloon was the first prototype to validate JEM-EUSO chain detection in extreme environmental conditions. The post flight analysis of the efficiency of EUSO-Balloon detection showed that only 30 % of the pixels met the technical requirements for the study of EAS et detection of UV background (required efficiency of photo-detection > 12%). The next prototypes of JEM-EUSO have as their mission the Extensive Air Shower (EAS) detection of UHECR with energies > 10 20 eV . An requirement for this, it is the validation of the systems trigger, which distinguish this luminescence over background noise UV. These systems trigger requires that all pixels are operational, this means, these pixels must be able to detect events corresponding to one photo-electron (pe) per gate time unit (GTU=2, 5 μs ). This work is about a method to offset, to some extent, the problem of efficiency loss of detection channels. The formation of a pulse signal corresponding to 1 pe is governed by the Poisson distribution, this means that there are pulses formed by the pil-up of two or more pulses. That may eventually be used to estimate the efficiency of pixels with weak performance.