A large Streamer Chamber muon tracking detector in a high-flux fixed-target application

Abstract

Arrays of limited streamer tubes of the Iarocci type were deployed in our experiment at CERN as part of a forward muon detector system with provisions for the beam to pass through the center of each panel in the array. A total of sixteen 4 m x 4 m panels were assembled with inductive readout strips on both sides of each panel. An active feedback system was deployed to regulate the high voltage to the streamer tubes to insure a constant e ciency for minimum ionizing particles. The arrays were operated in this environment for over ve y ears of data taking. Streamer tube track-reconstruction e ciencies and tube replacement rates are reported.