LHC injection losses for tighter collimator settings in view of HE-LHC

In view of the smaller physical apertures of Nb3Sn magnets for the HE-LHC study, a machine study was performed in the LHC to tighten correspondingly the ring and injection protection collimators and measure the change in loss behaviour. The smaller physical apertures will result in significantly smaller normalised apertures than what is presently available in the LHC. This report will address the question of whether Hilumi beam types can be injected with tight collimator settings. The results presented in this study will show the measured injection losses as a function of collimator setting with the preliminary attempts to extrapolate to higher injected intensities. This extrapolation will enable limitations of the collimator settings to be identified.