OSQAR Status Report: Progress in the Photon Regeneration Experiment

The status of the OSQAR experiments is presented highlighting the progress achieved in 2010. For the photon regeneration part, three experimental runs have been performed after thorough preparatory phases in the CERN SM18 test hall. For the first time, this experiment has been successfully conducted with two aligned LHC dipoles and the expected sensitivity was achieved for the search of light scalar and pseudoscalar particles. Concerning the measurement of the Vacuum Magnetic Birefringence (VMB), dedicated studies to integrate within a LHC dipole the newly developed ultra-fine ellipsometry techniques have been performed in collaborating Institutes.