The Evolution and Performance of the ATLAS Calorimeter-Based Triggers in 2011 and 2012

An overview is presented of the ATLAS triggers that use information from the calorimeter system. The identification of high transverse-energy electrons, photons, τ leptons and jets, as well high missing and total transverse energy, was optimised for the high-luminosity and high-pile-up running conditions at LHC in 2011 and 2012. Results are shown that demonstrate the achieved trigger robustness: the selection of possible physics signatures was performed with high efficiency while maintaining the rates within their required limits.