Upgrade of the TOTEM T2 Telescope, Technical Design Report

A new T2 detector for the TOTEM experiment is designed to measure the rate of inelastic proton-proton events in low luminosity special runs dedicated to the measurement of the total cross section at the highest LHC energy. With a pseudorapidity coverage of 5.3 < |η| < 6.5, the new T2 will detect more than 90 % of the inelastic events at a center-of-mass energy of 14 TeV and thus allow a precise inelastic rate and total cross section measurement. The corresponding elastic cross section will be used to normalize elastic differential cross section measurements at the same energy. The present TDR describes the physics motivation, the running scenarios, the technical requirements, the electronics and readout system as well as the construction timeline of the new T2.