Speaker
Description
The Large Hadron Collider (LHC) will be upgraded to increase its luminosity by a factor of 7.5 relative to the design luminosity. The ATLAS detector will undergo a major upgrade to fully explore the physics opportunities provided by the upgraded LHC. In order to optimize trigger efficiencies at the High-Luminosity LHC (HL-LHC), the Muon Spectrometer will be upgraded by replacing the MDT (Monitored Drift Tube) chambers by smaller-diameter MDT (sMDT) chambers and additional thin-gap RPC (Resistive Plate Chamber) trigger chambers in the barrel inner station. The University of Michigan ATLAS group is responsible for building 50% of the sMDT chambers. I will report on the construction and testing of the first 12 sMDT chambers built at the University of Michigan in 2021. Precision measurements and testing procedures will be described and the chamber precision and performance results will be presented.
