Results on CASTOR Performance during LHC Run 2

Results on various aspects of the performance of the CASTOR calorimeter in LHC Run 2 are presented. This includes the alignment, calibration and triggers of the detector. The intercalibration of the gains of the fine mesh PMT's using beam-halo muons is discussed, this in combination with results of a study on the noise and baseline. Two methods on obtaining gain correction factors for reweighing the gains between different high voltage settings are compared. Results on the efficiency of a CASTOR jet trigger are compared for LHC Run 2 collision data and Monte Carlo event generator predictions.