Commissioning of the new ATLAS Muon Central Trigger Processor Interface (MUCTPI)

The new Muon-Central-Trigger-Processor-Interface (MUCTPI) is part of the upgrade of the ATLAS Level-1 trigger system for the upcoming run of the Large Hadron Collider at CERN. High-end FPGAs receive and process muon candidate information arriving on 208 high-speed optical serial links, while the board is controlled by a SoC. Processed trigger information and summary data are sent to other parts of the trigger and data acquisition system. This paper describes the hardware setup, the online software as well as the integration and commissioning procedures carried out during the start of LHC Run 3.