The ALICE Dimuon Forward Spectrometer

The ALICE muon spectrometer is mainly dedicated to the measurement of the production of J/Psi, Psi\´, Upsi, Upsi\´, Upsi", through their decay into muon pairs, in different reactions like Pb-Pb, Ca-Ca, p-Pb, p-p. The study of vector mesons through their decay into muon pairs is one of the most promising signals to identify the quark-gluon plasma formation. Different detector prototypes were assembled and tested so far. After more than 10 years of design, R&D and production, all the muon spectrometer infrustractures are in place in the ALICE experimental hall and all detector modules and their electronics have been assembled. The installation phase is started (Fig. 1) and will be ended at the beginning 2007. In the following the main characteristics of the system, its performance and the physics program will be illustrated.