Simulation Studies of Characteristics and Performance of small-strip Thin Gap Chamber for the ATLAS New Small Wheel Upgrade

Small-strip, Thin Gap Chambers (sTGC) will be used for the primary Level-1 trigger in the ATLAS New Small Wheel muon spectrometer upgrade. In this note we present detailed simulation studies of sTGCs that include electric field distribution, electron transportation properties, charge production, etc. The timing performance of sTGCs with and without magnetic fields is simulated using the Garfield and Magboltz packages. Charge dispersion and charge sharing among adjacent readout strips are studied in detail to understand the required spatial resolution of $O(100)$ $\mu$m for the upgrade. The simulated charge ratios among strips are compared with beam test measurements performed in 2012.