What question did this study set out to answer?

The upgrade aims to enhance the performance and capabilities of the ATLAS calorimeter trigger to manage increased luminosity.

February 8, 2026Open Access

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

Puntos clave

The upgrade aims to enhance the performance and capabilities of the ATLAS calorimeter trigger to manage increased luminosity.
Implemented custom hardware using state-of-the-art FPGAs.
Assessed the capabilities and roles of different subsystems in the trigger architecture.
Evaluated preliminary performance estimates of the upgraded system.
Improved handling capacity of the first-level calorimeter trigger.
Enhanced overall data acquisition performance for the ATLAS detector.

Resumen

During the Long Shutdown 2 of the LHC, the ATLAS detector underwent its Phase-1 Upgrade in order to better handle the increased luminosity in LHC Run 3 and beyond. A significant part of this upgrade comprises new custom hardware for the first-level calorimeter-trigger path using state-of-the-art FPGAs. An overview of the different subsystems, their capabilities and roles in the overall ATLAS trigger and data acquisition architecture, and their relevance for the ATLAS physics program is presented. Finally, exemplary preliminary performance estimates are discussed.

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