The Phase-I Trigger Readout Electronics Upgrade of the ATLAS Liquid Argon Calorimeters

TL;DR

This paper details the upgrade of the ATLAS Liquid Argon calorimeters' trigger readout electronics, significantly improving data granularity, precision, and background rejection capabilities for higher luminosity operations.

Contribution

It introduces the final designs and validation procedures of the new electronic system, enhancing trigger performance during LHC operations.

Findings

Increased trigger readout granularity by up to ten times

Improved background rejection through advanced filtering algorithms

Successful commissioning demonstrating enhanced performance

Abstract

The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters enhances the physics reach of the experiment during the upcoming operation at increasing Large Hadron Collider luminosities. The new system, installed during the second Large Hadron Collider Long Shutdown, increases the trigger readout granularity by up to a factor of ten as well as its precision and range. Consequently, the background rejection at trigger level is improved through enhanced filtering algorithms utilizing the additional information for topological discrimination of electromagnetic and hadronic shower shapes. This paper presents the final designs of the new electronic elements, their custom electronic devices, the procedures used to validate their proper functioning, and the performance achieved during the commissioning of this system.