A gaseous muon detector at the HERA-B experiment

The muon detector of the HERA-B experiment at DESY is a gaseous detector that provides muon identification in a high-rate environment. Pairs of muons with an invariant mass in the region of the J//spl psi/ meson ensure the first level trigger for the experiment. Three different types of gas proportional chambers are employed: tube, pad and pixel. The Muon Detector is fully installed and has been continuously running since November '99. A clear signal for J//spl psi//spl rarr//spl mu//spl mu/ is reconstructed from data taken during the commissioning run. Design of the muon system as well as experience gained with detector commissioning are presented in the paper. The severe radiation environment of the HERA-B experiment leads to a maximum charge deposit on a wire, within the muon detector of 200 mC/cm per year. We report recent results of aging studies performed. By irradiating proportional wire chambers filled with Ar/CF/sub 4//CH/sub 4/ and Ar/CF/sub 4//CO/sub 2/ mixtures. Our experience shows that the aging rate depends not only on the total collected charge, but, in addition, could be affected by the mode of operation and size of the irradiation area.