Cathode Strip Chamber Performance of the Cms ME1/1 Muon Station

Cathode strip chamber (CSC) was chosen as the baseline detector of the CMS Endcap Muon System. First forward muon station ME1/1, located in the solenoid magnetic field, is the key station because it should provide precise matching between Muon Sytem and Inner Tracker. The ME1/1 CSC spatial resolution must be about 75 gm per station to achieve required muon momentum resolution and timing resolution of few ns for bunch crossing identification. Uncorrelated background rate is 1 kHz/cm(2) or 100kHz per readout channel. The solenoid magnetic field is up to 4 T. CSC design is described. R&D results of the CSC performance study are presented: spatial resolution, timing resolution, rate capability, track reconstruction efficiency, influence magnetic field on CSC parameters. Test of many CSC prototypes demonstrated that ME1/1 CSC performance meets CMS requirements.