ИСТИНА

The JEM-EUSO collaboration develops a series of balloon and orbital telescopes to detect transient UV emission from the Earth atmosphere, with the primary objective to study ultra-high-energy cosmic rays from space. These detectors are wide field-of-view telescopes (more that 20 degrees FOV) with high temporal resolution (1-2.5 µs) and sensitivity provided by a large aperture. One of these detectors is currently operating onboard the ISS (MINI-EUSO), one is planned to be launched in 2023 (EUSO-SPB2) and one is in preparation stage (K-EUSO). They all use the same photo-detection modules (PDMs) composed of 36 multi-anode photomultiplier tubes with 2304 channels in total. Mini-EUSO uses one PDM, EUSO-SPB2 uses three and K-EUSO will use more than 40. The calibration and detailed characterization of the performances of these PDMs in different modes of operation will be presented