Design of Punch-Through Protection of Silicon Microstrip Detector against Accelerator Beam Splash

Abstract In experiments at high intensity accelerators such as the LHC and its planned upgrade, HL-LHC, the silicon microstrip detector should be designed to survive against possible beam loss that may create large amount of signal charges in short period. We are designing a built-in protection structure based on a punch through mechanism for the p-bulk n + -readout sensors under development for the HL-LHC. The performance is evaluated by applying DC voltages and also by using a pulsed infrared laser to generate a large amount of current. The latter test provides the time information of the protection system.