CHARGED PARTICLE TRACKING WITH THE HERA-B DETECTOR

The HERA-B experiment at DESY is a large acceptance fixed-target spectrometer using a silicon vertex detector, an inner GEM MSGC detector and an outer large volume honeycomb drift chamber for track reconstruction. The detectors are operated in a radiation environment comparable to LHC conditions. The tracking detectors had been finished at the beginning of year 2000 and have been successfully operated. They represent the worlds largest operated GEM MSGC system and the so far largest drift chamber system for high-rate application. We report on the detector operation, and summarize the performances achieved. We present the performance of the track finding algorithm and report on the reconstruction performance for the year 2000 data.