CMS Technical Design Report for the Level-1 Trigger Upgrade

This report describes the technical design and outlines the expected performance of the Phase 1 Upgrade of the CMS Level-1 Trigger. The original design goal of the LHC was to operate at 1x10E34 cm-2s-1 with 25 ns bunch spacing, such that approximately 25 simultaneous inelastic collisions per crossing (“pile-up”) occur. With upgrades to the LHC, the luminosity and pile-up will more than double. The upgrade documented is designed to improve the performance of the Level-1 Trigger system at high luminosity with large numbers of pile-up events. To meet these requirements the electronics for the calorimeter, muon and global trigger systems will be replaced. The expected performance of these upgrades is discussed, including a detailed study of several Higgs-boson and SUSY analyses. The planning for the implementation of this upgrade is presented, including construction, testing, and installation.