Studio delle prestazioni del trigger muonico dell'esperimento ALICE con collisioni p-p a 7TeV

The work presented in this thesis is carried out in 2010 during the first p-p runs at a center-of-mass energy of 7TeV, after the wintry shutdown, in a phase of further study and refinement of the muon trigger, the detector belonging to the muon spectrometer of the ALICE experiment. ALICE is the LHC experiment dedicated to the study of the heavy-ion collisions at energies never reached before by other experiments. The muon spectrometer is the system dedicated to the study of quarkonia and heavy-flavors via the muon channel decay and is formed by a tracking and a trigger detector. Analyzing these first data and also some tests carried out in the same period in the INFN Turin laboratories, the possibility of decreasing the RPCs discrimination thresholds for improving the detector performances is discussed by studying three important parameter: efficiency, noise rate and cluster size. Finally, after changing the thresholds, the final fine tuning of all high voltages is reported and discussed.