Calibration and signal reconstruction in the ATLAS Tile Hadronic calorimeter

TileCal is the central hadronic calorimeter of the ATLAS detector which is one of the four experiments installed at the Large Hadron Collider (LHC) at CERN. In order to calibrate the full read-out path in TileCal different calibration systems are present. The full calibration process relies on three subsystems: the Charge Injection System (CIS), the Laser System, and the Cesium. The signal reconstruction determines the amplitude and the time of the deposited energy. In TileCal the Optimal Filter (OF) algorithm is used for this purpose; in particular the signal is reconstructed in the Read-Out Drivers (ROD) using the Digital Signal Processor (DSP).