Integration and commissioning of the ATLAS muon-trigger system, TGC

Thin Gap Chamber (TGC) is a technology which is used in the endcap region of ATLAS spectrometer for triggering muons. On both sides of the interaction point, three disc-shaped stations with a diameter of 24 m are placed. Each station consists of 12 sectors, in total 72 sectors are assembled on the surface and integrated in the ATLAS cavern. The sector assembly project started in March 2005 and completed in August 2007. All six discs were integrated by the end of September 2007. The commissioning task for the assembled sector was performed intensively, as a result, the rate of dead channel was controlled at the level of 10(-4), and all chambers are working stably with normal operation condition in the pit.