Abstract

The ATLAS detector at the LHC at CERN is entering the last phase of construction, with the ATLAS calorimeter passing already the first steps of commissioning. The endcap region in the range of pseudorapidity 2.4 < |η| < 4.0 is a particular complex one, with the electromagnetic, hadronic and forward calorimeters. In a dedicated beam run this region has been studied using the individual calorimeter modules. The set‐up was as close as possible to the real ATLAS calorimeter, including all details like inactive support material structures. The goal is to validate the MC simulation for the different regions and to cross check the intercalibration of the various calorimeters. Electron and pion data have been taken in an energy range 6 < E < 200 GeV with special emphasis on lateral and vertical scans to study the transition regions in detail.

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