Performance of irradiated and non-irradiated 500 μm thick-silicon microstrip detectors

The decision-taken by the CMS experiment to build a tracker entirely based on silicon detectors has made necessary the use of thicker sensors instead of the usual 300 μm ones for the outer part of the detector. We present first results on the performance of 500 μm thick detectors, before and after neutron irradiation, bonded to the CMS tracker front-end electronics. Laboratory measurements show that the total collected charge scales linearly with thickness when compared with a 300 μm module and the measured noise is in good agreement with expectations. The results obtained confirm the feasibility of large area silicon trackers