Updated parameters for HL-LHC aperture calculations for proton beams

During the accelerator design, it is important to have a reliable way of estimating the available aperture, in order to ensure a sufficient beam clearing and avoid potentially limiting beam losses on the aperture. Such calculations can be performed using MAD-X, taking as input the beam parameters and the tolerances of, e.g., orbit and optics. Realistic tolerances and an accurate criterion for qualifying the aperture are crucial during the design stage, in order to ensure that all machine apertures are sufficiently protected from harmful beam losses. Previous studies have provided such parameter sets for aperture calculations for both LHC and HL-LHC. This report provides an update to the previous HL-LHC parameters at top energy. First we study the protected aperture that can be tolerated in arbitrary locations without local protection. Furthermore, we investigate also how the protected aperture can be improved using a specially matched phase advance between dump kickers and the tertiary collimators, as was done for the LHC in 2016.