Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Electronics, Trigger, DAQ III

T 70.1: Talk

Thursday, March 19, 2026, 16:15–16:30, KH 00.023

The Hypothesis Firmware for the ATLAS L0 Trigger system for HL-LHC — •Emanuel Meuser — Institut für Physik, Johannes Gutenberg-Universität Mainz

During the upgrade for HL-LHC, parts of the ATLAS detector will be upgraded, and the time-multiplexed L0Global Trigger system will be added to the first-level trigger. As part of this L0Global Trigger system, a hypothesis firmware to evaluate all the trigger objects/candidates of an event in a serialized and non-LHC-synchronous manner will go into operation in 2031.

This hypothesis firmware has to perform multiplicity triggers, as well as topological ones, as configured by a trigger menu. Since this trigger menu can change in periods too short to rebuild and validate new firmware, the hypothesis firmware needs to be runtime-configurable within certain boundaries. The design and implementation of the hypothesis firmware, focusing on resource optimization, robustness, and configuration via a trigger menu, will be discussed.

Keywords: ATLAS; L0Global; FPGA; Trigger