Test of High-Resolution Muon Drift-Tube Chambers for the Upgrade of the ATLAS Experiment

High-resolution muon drift-tube chambers were studied as a part of the planned upgrades of the ATLAS detector for the high luminosity (HL) LHC. To suppress fake muon triggers, observed in the transition region from the barrel to the endcaps of the ATLAS muon spectrometer, 16 new so-called "BIS-78" sMDT chambers will be installed in this region. As a part of this thesis, functionality tests of the eight A-side sMDT chambers are performed prior to their installation in the ATLAS detector, during the 2019/20 shutdown of the LHC. All chambers are tested in a cosmic-ray test stand. The chamber performance is characterized by measuring the noise rates, spatial resolution and the muon detection efficiency of each drift tube in the chamber. The second part of this thesis is dedicated to determination of the operational point of the amplifier-shaper-discriminator (ASD) chips for the new read-out electronics, which was developed for the operation at the HL-LHC. The noise rates, spatial resolution and muon detection efficiency are determined with two read-out cards carrying new ASD chips.