Residual Gas Density Estimations in the LHC Insertion Regions IR1 and IR5 and the Experimental Regions of ATLAS and CMS for Different Beam Operations

The residual gas density for proton-proton runs in the LHC Insertion Regions IR1, and IR5, up to the interaction point (IP) has been estimated using the VAcuum Stability COde (VASCO) [1]. In addition to previous calculations [2], the experimental regions have been considered. The estimations have been performed for the two scenarios of machine start-up and after machine conditioning [3]. Different machine filling factor schemes have been analysed, namely with 43, 156 and 2808 bunches at nominal beam energy (7TeV) and intensity. With respect to ref. [2], the code has also been refined and numerical errors have been reduced. The results can be used for estimation of background noise to the LHC experiments for those operation phases.