Recent developments in the ATLAS pixel detector

Silicon pixel detectors, developed to meet LHC requirements were tested in 1998 and 1999 within the Atlas collaboration in the H8 beam at CERN. Different sensor designs have been studied using an analog front-end electronics chip. In this work a detailed experimental study of the overall performance of both irradiated and not irradiated detectors for the different designs is presented, with special emphasis to efficiency, charge collection and resolution measurements. Behavior of detectors in a magnetic field is also discussed.