ATLAS electromagnetic calorimeter, construction and test of a large scale system

The construction of the ATLAS liquid argon presamplers and accordion calorimeters are about to be completed. The first half-length barrel wheel is already installed in the cryostat and assembly of the second wheel is about to be finished. Modules for the first end-cap wheel are ready and the assembly of the first wheel is well under way. From 55 000 output channels of the first barrel wheel only four channels are malfunctioning and a very small fraction of high voltage area has showed problems, ∼0.15%. After a review of the construction, production, and assembly, results concerning the energy and position resolution are shown.