ATLAS New Small Wheel: sTGC testing and assembly

The Large Hadron Collider (LHC) is under extensive upgrades to achieve a higher luminosity [1]. This will allow the LHC experiments to have a greater sensitivity to new physics at multi-TeV energies. In anticipation of the higher collision rate and background, the innermost endcap of the current ATLAS Muon System is being replaced with the New Small Wheel (NSW) during the second large shut down of the LHC (2018-2021). The NSW consists of two types of detectors using small-strip Thin Cap Chambers (sTGC) and MicroMegas (MM) technologies respectively. The sTGC detectors aim to provide fast trigger and high precision muon tracking under high luminosity conditions. The sTGC quadruplets are currently being constructed in five countries and shipped to CERN. At CERN, multiple tests are performed on the quadruplets before they are assembled into wedges. The wedge assembly process will be reviewed and the electrical connectivity test, also known as the “pulser test”, will be described in detail.