A MIP Timing Detector for the CMS Phase-2 Upgrade

This document is the Technical Design Report (TDR) of the MIP Timing Detector (MTD), a new detector planned for CMS during the High Luminosity LHC (HL-LHC) era. This device will bring a completely new capability to CMS: the ability to measure precisely the production time of minimum ionizing particles (MIP) for use in disentangling the approximately 200 nearly-simultaneous pileup interactions that will occur in each bunch crossing of the LHC. It also provides new capabilities for charged hadron identification and the search for long-lived particles.