ATLAS SCT Commissioning – TWEPP-08

The Barrel and Endcaps of the ATLAS SemiConductor Tracker have been installed in the ATLAS cavern since summer 2007. All the electrical and optical services were connected and rapid tests performed to verify their continuity. Problems with the cooling circuits, meant that the time for detailed tests in 2007 was limited. These problems have now been resolved allowing the SCT to be operated and participate in combined ATLAS Cosmic ray data taking runs. The results of these runs have been used to determine the hit efficiency of the modules as well as providing invaluable constraints for the detector alignment.