Proton-Induced Radiation Damage in Twenty cm Long LYSO:Ce and BaF₂Y Crystals

Abstract

Inorganic scintillators are widely used in high-energy physics (HEP) experiments. Bright and fast cerium doped lutetium yttrium oxyorthosilicate (Lu₂₍₁₋ₓ₎Y₂ₓSiO₅:Ce or LYSO:Ce) crystals have been chosen to construct the CMS barrel timing layer (BTL) detector at the high luminosity large hadron collider (HL-LHC), where up to 2.5 Mrad ionization dose, 1.7 × 10¹³ charged hadrons/cm² and 2 × 10¹⁴ n_(eq) /cm² are expected. With an ultrafast scintillation of less than 0.6 ns decay time and a suppressed slow component yttrium doped BaF₂ (BaF₂:Y) crystal is a promising ultrafast inorganic scintillator for future HEP time of flight and calorimeter applications at the energy and intensity frontiers. Twenty cm long LYSO:Ce and BaF₂:Y crystals were irradiated by 800 MeV proton beam at the blue room of Los Alamos Neutron Science Center (LANSCE) up to 7.5 × 10¹⁵ p/cm². We report degradation of their optical and scintillation properties.

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