Speaker
Description
The largest phase-1 upgrade project for the ATLAS Muon System at LHC is the replacement of the first forward stations with New Small Wheels (NSWs). Along with Micromegas, NSWs will be equipped with 8 layers of small-strip thin gap chambers (sTGC) arranged in multilayers of 2 quadruplets, for a total active surface of more than 2500m2. Each sTGC plane must achieve a spatial resolution better than 100μm to allow trigger track segments to be reconstructed with an angular resolution of 1mrad. sTGC consist of a grid of gold-plated tungsten wires sandwiched between 2 resistive cathode planes at a small distance from the wire plane. The precision cathode plane has strips with a 3.2mm pitch for precision readout and the cathode plane on the other side has pads for triggering. The sTGC design, performance, construction and integration status will be discussed, along with results from tests of chambers with nearly final electronics with beams, cosmic rays and high-intensity radiation sources.
