ATLAS calorimeter performance for charged ions

The intrinsic performance of the ATLAS barrel and extended barrel calorimeters for the measurement of charged pions is presented. Pion energy scans (E=20, 50, 200, 400, and 1000 GeV) at two pseudo-rapidity points (η=0.3 and 1.3) and pseudorapidity scans (-0.2<η<1.8) with pions of constant transverse energy (ET=20 and 50 GeV) are analysed. A simple approach, that accounts in first order for noncompensation and dead material effects, is used for the pion energy reconstruction. The intrinsic performances of the calorimeter are studied: resolution, linearity, effect of dead material, tails in the energy distribution. The effect of electronic noise, cell energy cuts and restricted cone size are investigated