Speaker
Description
As we push to increase the instantaneous luminosity of the ATLAS detector, strict requirements on events are needed in order to reduce the output rate to the desired 1-1.5kHz. We can be clever about how we select events; imposing topological requirements through kinematic and angular cuts on combinations of particles allows us to further reduce the event rate without having to tighten the individual trigger objects thresholds required. In Run 2, the ATLAS detector successfully operated the Level-1 Topological trigger as part of the Level-1 Trigger system, taking inputs from the calorimeter (L1Calo) and muon systems (L1Muon). In parallel, a bitwise simulation system ran within the High-Level trigger (HLT) that acted as an important tool not only during commissioning, but for monitoring and validation. Moving into Run 3 (Phase-1), a new L1Topo hardware system has been implemented, and has been in commissioning during 2022 alongside the commissioning of the new L1Calo hardware system. During this time, the L1Calo and L1Topo Run-2 systems have been running in parallel with the Phase-1 system, allowing continuity of performance. New topological algorithms for Run 3 have been completed, along with adaptations in the simulation framework for the new inputs from L1Muon and L1Calo as they became available. The motivation, implementation and commissioning results of the L1Topo system in Run 2, along with the status of the commissioning of the new L1Topo system in Run 3 will be shown.
| Which session do you think it fits best? | Trigger Algorithms, ML / AI applications |
|---|
