Progress report on the ATLAS liquid argon presampler

Abstract

The electromagnetic calorimeter of the ATLAS experiment at the CERN Large Hadron Collider (LHC) will be of the accordion liquid argon (LAr) type. To a c hieve su cient energy resolution it is necessary to correct for the energy loss upstream of the calorimeter. For this purpose a separate presampler detector, providing a shower sampling in a thin LAr layer (11 mm in depth) before the calorimeter, was developed by the ATLAS collaboration and tested at CERN in September 95. The combined response of this detector and a calorimeter prototy p e t o m uons and electrons is presented.