Muon DT Upgrade

The muon Drift Tube (DT) system of the CMS (Compact Muon Solenoid) detector will undergo a program of upgrades accommodating to the LHC (Large Hadron Collider) schedule. Based on the present excellent performance of the system and on the expectations of an adequate operation of the detector at higher luminosity, upgrades for Phase 1 are focused on improving the reliability of the system and in particular of a few electronics parts. Accordingly, efforts are concentrated on consolidating two aspects: the Trigger Boards (TRB) and the Sector Collector (SC) electronics. For the Phase 2 upgrade, with luminosities exceeding up to a factor 10 CMS design parameters, the main concern is the reduction of the L1A (Level 1 Accept) trigger rates without imposing a significantly high transverse momentum cut. The status of the overall DT upgrade project is reviewed in the text.