High rate and ageing studies for the drift tubes of the Atlas muon spectrometer [Elektronische Ressource] / vorgelegt von Stephanie Zimmermann

High Rate and Ageing Studiesfor the Drift Tubes of theAtlas Muon SpectrometerDISSERTATIONzurErlangung des DoktorgradesderFakultat? fur? Mathematik und PhysikderAlbert-Ludwigs-Universit?at Freiburg im Breisgauvorgelegt vonStephanie ZimmermannM?arz 2004Dekan: Prof. Dr. R.SchneiderReferent: Prof. Dr. G.HertenKorreferent: Prof. Dr. A.BambergerTag der mundlichen Prufung: 18. Mai 2004? ?High Rate and Ageing Studiesfor the Drift Tubes of theAtlas Muon SpectrometerbyStephanie ZimmermannMarch 2004Universitat Freiburg Fakultat fur Physikim Breisgau und MathematikAbstractThe muon spectrometer of Atlas, one of the 4 experiments currently under constructionat the Large Hadron Collider LHC, relies on Monitored Drift Tubes (MDTs) for trackreconstruction in most of its regions. The MDTs will have to sustain count rates upto 1500Hz/cm and must be able to survive an accumulated charge of up to 0.6C/cmduring 10 years of operation. This thesis presents results of high rate and ageing studiesconducted at the CERN Gamma Irradiation Facility GIF; a series production Atlas muonchamber and a prototype of the gas recirculation system planned at LHC were used forthe first time.TestbeammuonswereutilizedtoevaluatetheMDThighratebehaviour; questionsofres-olution, efficiency and changes in the drift properties of the operating gas were addressed.ThemeasurementswerecomplementedbysimulationswiththeprogramGARFIELD.