Recepção do sinal de múons no calorímetro hadrônico do experimento atlas

Abstract

This work presents the studies about the reception of the muon signal generatedinahadroniccalorimeterofahighenergyphysicsexperiment(ATLAS),which is used for energy sampling and absorbtion of the particles from the proton-proton collisions at LHC (Large Hadron Collider), CERN. The aim of these studies is the development of a detection system envisaging its integration with the online event validation system of ATLAS, one of the main experiments at LHC. Considering the muon signal reception, the reception circuit is proposed, based in wideband operationalamplifiers,andsimulationresultsusingrealmuondataacquiredatATLASare presented, showingthegoodperformanceoftheproposedcircuit. Studiesaboutthe compensation of a long cable used to transmit the muon signal from the calorimeter up to the reception circuit are also performed, aiming to recover the signal velocity in order to avoid signal pile up problems. The results shown that the best approach forthecablecompensationistheuseofadigitalfirstorderFIRfilterduetoitssimplicity and flexibility. The muon signal detection was studied envisaging to evaluate the effect of the cable compensation. The matched filter and the neural detectors shown similar performance and was also shown that the cable compensation filter did not harm the detection performance, while it recovers the signal velocity.