The Euso Mission for the Observation of Ultra High Energy Cosmic Rays from Space

The EUSO experiment is currently under study by ESA for a possible installation on the International Space Station. The experiment is designed to observe, by means of a space-based apparatus, the Extensive Air Showers produced in the atmosphere by Ultra High-Energy Cosmic Rays. The design of a large aperture, large field of view, fast and high granularity, single-photon Photo-Detector, sensitive in the near UV and suitable for a few years of operation in space is a challenging task. The basic aspects of the current concept of the EUSO mission, based on the presently known requirements and constraints, and the results of the preliminary studies carried on so far will be described.