Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 41: DAQ, trigger and electronics II

T 41.5: Talk

Tuesday, March 16, 2021, 17:00–17:15, Tp

Jet algorithm performance studies of the Phase-1 upgrade of the ATLAS Level-1 Calorimeter Trigger — •Lisa Marie Baltes — Kirchhoff-Institute for Physics, University Heidelberg, Germany

The ATLAS Level-1 Calorimeter Trigger (L1Calo) identifies events containing objects such as electrons, photons, tau leptons, jets and missing transverse energy and therefore plays an important role in the data taking process of the ATLAS detector. In order to address the challenges introduced by the increased luminosity of the Large Hadron Collider in Run 3, the L1Calo Phase-1 upgrade includes several hardware and software-based updates. Within the new system, the granularity of the data from the electromagnetic calorimeter being sent to the L1Calo trigger is increased by a factor of 10. Instead of using trigger tower information, the trigger readout in Run 3 consists of so-called supercells. Several new trigger algorithms, which are implemented via FPGAs, are developed to maintain a good trigger performance even in high pile-up conditions. In order to evaluate the rates of these Run 3 algorithms, Run 2 data is used by merging the offline cells into Run 3 supercells. This can be cross-checked using Monte Carlo simulations. This talk motivates the use of the supercell emulation and shows preliminary results of the jet algorithm performance studies.