Abstract
An online control system to calibrate and monitor ATLAS Barrel hadroniccalorimeter (TileCal) with a movable radioactive source, driven by liquid flow, is described.To read out and control the system an online software has been developed, using ATLASTDAQ components like DVS (Diagnostic and Verification System) to verify the hardware beforerunning, IS (Information Server) for data and status exchange between networked computers,and other components like DDC (DCS to DAQ Connection), to connect to PVSS-based slowcontrol systems of Tile Calorimeter, high voltage and low voltage. A system of scripting facilities,based on Python language, is used to handle all the calibration and monitoring processes fromhardware perspective to final data storage, including various abnormal situations. A QT basedgraphical user interface to display the status of the calibration system during the cesium sourcescan is described. The software for analysis of the detector response, using online data, isdiscussed. Performance of the system and first experience from the ATLAS pit are presented.
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