The ATLAS SCT endcap: From module production to commissioning

Abstract

The ATLAS experiment at the Large Hadron Collider (LHC) at CERN is aiming for new physics at TeV scale energy and will be operational in 2007. The Semiconductor Tracker (SCT) is a part of the ATLAS Inner Detector (ID) and consists of 4088 silicon detector modules displayed on four concentric barrels and two endcaps on each side. Almost 2400 endcap modules have been produced in seven assembly sites including a 20% contingency. All the qualified modules have been shipped to the two macro-assembly sites where the modules are now mounted to the discs. A major organizational effort around the components and the logistics has been made to ensure that the project is running with a high yield and within the schedule. Well defined and strict quality assurance rules allowed the endcap community to achieve an average production yield of 92.9%. In order to complete the two endcaps, a major effort is made for finalizing the assembly of modules and services onto the discs and carbon fiber cylinder, respectively. After describing the organization of the endcap module assembly and the production results, a description and status of the endcap macro-assembly and services will be reported.