Improving pixel detectors: Active area optimization and high temperature annealing

The existing pixel tracking detectors of ATLAS and CMS experiments will have to be replaced after LHC luminosity upgrade (super-LHC or sLHC), due to increased radiation level and tracking performance requirements. We are studying device active area re-optimization by cutting away dead area and some of the guard rings of existing sensors. Performance of the cut sensors will be described. We also present a feasibility study of operating irradiated silicon sensors after extreme temperature excursion characteristic of a standard bump-bonding process. This is relevant for high dose radiation studies before a sLHC-quality readout ASIC is developed.