The method and results of measurement of the optical parameters of the UHECR detector for the TUS space experiment

The TUS space experiment is aimed to study the energy spectrum and arrival direction of Ultra High Energy Cosmic Rays (UHECR) at E~1020eV. The TUS detector will measure the fluorescence and Cherenkov light radiated by Extensive Air Shower of the UHECR using the optical system that comprises a Fresnel mirror-concentrator of seven modules with a total area of ~2m2. The production process of the Fresnel mirror and the method and results of measurement of its optical parameters are presented.