Radiation-hard active pixel sensors for HL-LHC detector upgrades based on HV-CMOS technology

Abstract

Currently deployed silicon sensors in particle tracking detectors of the Large Hadron Collider (LHC) experiments will not withstand the augmented radiation levels in the foreseen High-Luminosity upgrade of the LHC (HL-LHC). Therefore, improved radiation hard sensors are necessary for HL-LHC experiments. We have developed several prototypes of High-Voltage CMOS (HV-CMOS) sensors compatible with the current read-out chip of the ATLAS pixel detector, FE-I4, and compatible with various analog and digital strip read-out systems. This paper shows results of spectrum measurements with a Strontium-90 radioactive source of a sensor irradiated to 1015 (1 MeV neq)/cm2. Preliminary data analysis yields a charge signal decrease as much as 31% due to irradiation. An outlook on measurements with an enhanced setup to confirm the number stated above is given.