Timing Behavior of the ATLAS Pixel Detector in Calibration, Cosmic-Ray and Collision Data

The status of the timing performance of the ATLAS Pixel Detector is presented. We describe both the calibration methods and analyses used to determine the basic timing characteristics of the front-end electronics as well as the measurement of the entire timing signal propagation chain, performed using both cosmic rays and collision data. The readout synchronization of the Pixel Detector modules with respect to each other and to an external timing reference is analyzed. We describe the timing optimization process, as the detector operation progressed from commissioning with cosmic ray data to commissioning with collisions and finally to steady-state data taking. Lastly, we outline the timing measurement program to be performed during the first year of LHC operation, as a function of increasing LHC luminosity.