Performance of the LHCb Silicon Tracker in pp collisions at the LHC

The LHCb detector is designed to study the decays of B-mesons in proton-proton collisions at the Large Hadron Collider (LHC). The detector is a single arm forward spectrometer with excellent tracking and particle identification capabilities. The Silicon Tracker (ST) consists of two detectors both of which are constructed from silicon micro-strip detectors with long readout strips. The performance of these detectors in the first high energy collisions at the LHC is presented here. The data collected in 2010 has been used to determine the optimal time and spatial alignment of the detectors. A detailed study has also been made of the intrinsic detector efficiency and resolution. The latest results on detector performance will be shown and compared to the expectation from previous measurements and the simulation of the detector.