MONITORED DRIFT TUBE CHAMBER PRODUCTION AT LABORATORI NAZIONALI DI FRASCATI

The muon Spectrometer of the ATLAS experiment is instrumented with precision tracking chambers made of layers of drift tubes assembled together with very high mechanical positioning accuracy. The chambers are arranged in three stations (inner, middle and outer). The middle station in between the coils of the toroid magnet in the barrel is built at Laboratori Nazionali di Frascati of INFN, where methods for the construction of the drift tubes and the precision assembly of the chambers have been developed. These methods aim at both achieving the required performance of the detector as well as a high level of automation in the serial production of the chambers. The construction methods and the first results of the production are presented.