The TUC detector was launched on board the Lomonosov satellite from the Vostochny Cosmodrome and put into the sun-synchronous orbit on 28 April 2016. Measurement of the spectrum, mass composition, and anisotropy of the Ultrahigh-Energy Cosmic Rays (UHECRs) with the energy E ~ 10^20 eV (1000 times higher than the LHC energy) and search for UHECR sources are among the most important tasks of high-energy astrophysics.
Despite multi-year investigations of Extended Atmospheric Showers (EASs) produced by UHECR particles, the main questions of UHECR physics remain open questions primarily because of insufficient experimental statistics due to very low fluxes (~1 particle per area of 100 sq. km in 100 years) and inconsistency of the available data. In this connection, of particular interest are the new investigations of EASs from UEHCR particles to be carried out on board an earth orbiter. An important advantage of this detector is a possibility of gaining data from all directions of the celestial sphere by the same apparatus using the same method and also a possibility of simultaneously measuring fluorescent and Cherenkov signals from EASs. The TUC experiment is the first detector of this kind for investigations of UHECRs in the space orbit. Over 200000 events were recorded for two years of its operation in the orbit. The main points covered at the seminar were preparation of the experiment, Monte Carlo simulation, online event selection systems, development of the software for visualization and reconstruction of events, and preliminary results of their physical analysis.
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