Status of the Endcap Muon System for the Compact Muon Solenoid Experiment

Presented are the design and status of the Endcap Muon System of the Compact Muon Solenoid (CMS) detector under construction for the Large Hadron Collider, a 14 TeV proton-proton collider. The CMS Endcap Muon System consists of 468 Cathode Strip Chambers with a total sensitive area of 6000 square meters, and it provides a spatial resolution of 100 microns per track in a six-plane chamber. The system provides muon identification, momentum measurement, and a Level- 1 trigger. It is currently fully installed, and cosmic-ray data is being recorded at CERN.