OVERVIEW OF THE CMS ELECTROMAGNETIC CALORIMETER

The Compact Muon Solenoid (CMS) is one of two ominpurpose experiments to be constructed at the Large Hadron Collider (LHC) at CERN. CMS incorporates a precision Electromagnetic Calorimeter which will be the largest crystal calorimeter ever constructed. The harsh environment at the LHC places stringent demands on the detector components. Following an extensive development period production of parts for the CMS ECAL is under way. An overview of the current project status is presented including results from recent prototypes and quality control tests on production components.