CSC Performance at High Background Rates

The different factors affecting on the CSC performance at high rate were considered. Their influence on the chamber position resolution and track inefficiency were estimated and measured in the beam test. The full size CSC prototype was tested at the X5 high radiation facility at CERN. The beam test demonstrated position resolution of 70 microns and inefficiency of 24.5 percent in the single layer at the maximum expected background rate. The performance of the CSC muon station as a whole was also estimated on the basis of the measured single layer characteristics. This study shows that for uncorrelated background in the worst case (eta=2.7) the muon station position resolution and track inefficiency are 50 microns and 2 percent respectively.