Speaker
Description
The ATLAS level-1 calorimeter trigger is a custom-built hardware system
that identifies events containing calorimeter-based physics objects,
including electrons, photons, taus, jets, and total and missing transverse energy.
In Run 3, L1Calo has been upgraded to process higher granularity
input data. The new trigger comprises several FPGA-based feature extractor modules,
which process the new digital information from the calorimeters and
execute more sophisticated trigger algorithms. The design of the
system will be presented along with an analysis of the improved
performance for identifying interesting proton-proton collisions in the increasingly
challenging Run-3 LHC pile-up environment, as well as in heavy ion collisions where
timing and noise effects are particularly challenging.