Radiation hardness of small-pitch 3D pixel sensors up to HL-LHC fluences
Abstract
A new generation of 3D silicon pixel detectors with a small pixel size of 50×50 and 25×100 μm2 is being developed for the HL-LHC tracker upgrades. The radiation hardness of such detectors was studied in beam tests after irradiation to HL-LHC fluences up to 1.4×1016 neq/cm2. At this fluence, an operation voltage of only 100 V is needed to achieve 97% hit efficiency, with a power dissipation of 13 mW/cm2 at -25C, considerably lower than for previous 3D sensor generations and planar sensors.
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