  Lutetium-Yttrium Orthosilicate doped with Cerium (LYSO:Ce), as a bright
scintillating crystal, is a candidate for calorimetry applications in strong
ionizing-radiation fields and large high-energy hadron fluences as are expected
at the CERN Large Hadron Collider after the planned High-Luminosity upgrade.
There, proton-proton collisions will produce fast hadron fluences up to
~5E14/cm^2 in the large-rapidity regions of the calorimeters. The performance
of LYSO:Ce has been investigated, after exposure to different fluences of 24
GeV/c protons. Measured changes in optical transmission as a function of proton
fluence are presented, and the evolution over time due to spontaneous recovery
at room temperature is studied. The activation of materials will also be an
issue in the described environment. Studies of the ambient dose induced by LYSO
and its evolution with time, in comparison with other scintillating crystals,
have also been performed through measurements and FLUKA simulations.
