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The Tile Calorimeter is the barrel hadronic calorimeter of the ATLAS detector, covering the region |η |<1.7. It is a non-compensating sampling device made of plastic scintillator embedded in an iron structure. The construction phase of the calorimeter is almost complete, and most of the effort now is directed towards the final assembly and commissioning in the underground experimental hall. The central part of the barrel is already assembled and the electronics is in installation and commissioning phase. The design requirements and layout of the calorimeter are presented, as well as its expected performance for jets. Detector calibration and commissioning are briefly discussed, showing the first cosmic events taken by the Tile Calorimeter in the ATLAS cavern during commissioning. During the last few years a comprehensive testbeam program has been followed in order to establish the calorimeter electromagnetic energy scale, to study its uniformity, and to tune the Monte Carlo simulations. During the combined testbeam period in 2004, lasting several months, data have been acquired with a complete slice of the central ATLAS barrel, inner and muon detectors, as well as both calorimeters. The data collected in the testbeam are used to study algorithms for hadronic energy reconstruction using single particles and the generalization of these algorithms is crucial for the jet reconstruction. Preliminary results on detector performance such as energy resolution and linearity are presented.

The Atlas Tile Calorimeter Road to Physics