Description of the Tile Calorimeter noise with increasing Pile-up for $\sqrt{s}=7\,\rm{TeV}$ data collected during 2011

In this note the noise in the Tile calorimeter is investigated with special attention to the pile-up effect. A full survey of the TileCal cells is performed, based both on pseudorapidity, bunch position in a train and number of interactions per bunch crossing. Several periods of 2011 data collected by the ATLAS experiment at $\sqrt{s}=7\,\rm{TeV}$ were used in the analysis. Just one run from each data-taking period corresponding to different pile-up conditions was examined. The data were recorded by zero bias trigger. The Monte Carlo simulation was reweighted to the pile-up conditions of the data. This study contributes to a better knowledge of the Tile Calorimeter response and performance under increasing pile-up conditions.