Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 86: DAQ, trigger and electronics IV

T 86.5: Talk

Thursday, April 2, 2020, 17:30–17:45, L-3.015

Readout of the Tile Rear Extension Module for the Phase-I upgrade of the ATLAS L1Calo Trigger System — •Tigran Mkrtchyan — Kirchhoff-Institut für Physik, Heidelberg

For Run 3, the ATLAS Level-1 Calorimeter Trigger (L1Calo) system is being upgraded with new subsystems, called feature extractors (FEXes). While the Liquid Argon calorimeter will send fine-granularity digital data to the FEXes, the Tile Calorimeter (TileCal) will continue to send analogue signals to the existing L1Calo Pre-processor (PPr) subsystem. In order to provide the FEXes also with digital results from the TileCal, the L1Calo PPr is being extended with new Tile Rear Extension (TREX) modules. Equipped with advanced FPGAs and high speed optical transmitters, the TREX provides digitized hadronic transverse energy (E_T) results in real-time at the LHC clock frequency to the FEX processors via optical fibers running at 11.2 Gbps and to the legacy L1Calo processors via existing 11 m long electrical cables. Additionally, for verifying the accepted trigger decision, the TREX formats and transfers event data to the DAQ system. The event data transfer is performed via a single optical link running at 9.6 Gbps to the Front-End Link Exchange (FELIX) board. The interface to the legacy readout path to the DAQ is preserved via a single optical link running at 960 Mbps in G-Link transmission mode. In this talk, the status of production, commissioning, test results of the TREX to FELIX readout path and the data formatting analysis will be presented.