25th IEEE Real Time Conference - La Biodola, Elba, Italy

The phase-1 upgrade of the ATLAS level-1 calorimeter trigger

25 May 2026, 18:35

20m

Maria Luisa Room (Hotel Hermitage)

Oral presentation Data Acquisition and Trigger Architectures Data Acquisition and Trigger Architectures

Speaker

Niklas Schmitt (Johannes Gutenberg Universitaet Mainz (DE))

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.