ATLAS and CMS Upgrade Plans

It is foreseen to significantly increase the luminosity of the LHC {cite {LHC}} by upgrading towards the HL-LHC (High Luminosity LHC) in order to harvest the maximum physics potential. Especially the PhaseII-Upgrade foreseen for 2021 will mean previously unseen track densities from the high instantaneous luminosity, and extremely high radiation levels proportional to the total integrated luminosity over the lifetime of the detectors. In addition, the existing detectors will have accumulated a significant radiation dose already by the time of the long shutdown before the HL-LHC starts. In order to keep the performance roughly at present levels in the challenging HL-LHC conditions, major upgrades of the detectors are planned. In particular the inner detector systems of both experiments will need to be replaced to maintain the tracking, vertexing and b-tagging capabilities. For this replacement, all-silicon central trackers are being studied in the two general purpose LHC experiments ATLAS and CMS. This paper describes the layout and technical details of the planned silicon detector systems for both experiments. Due to space constraints, only a limited selection of individual upgrade details can be presented here. Given the B-Physics centered focus of the Beauty conference series, this paper largely concentrates on upgrades to the silicon-based inner detector components that are vital to e.g. the identification of secondary vertices