Abstract

Electronics developments are pursued for the trigger readout of the ATLAS Liquid-Argon Calorimeter towards the Phase-I upgrade scheduled in the LHC shut-down period of 2019-2020. The LAr Trigger Digitizer system will digitize 34,000 channels at a 40 MHz sampling with 12 bit precision after the bipolar shaper at the front-end system, and transmit to the LAr Digital Processing system in the back-end to extract the transverse energies. Results of ASIC developments including quality assurance and radiation hardness evaluations, performances of the nal prototypes and results of the system integration tests will be presented along with the overall system design.

Highlights

  • ATLAS Liquid-Argon Calorimeter (LAr) is a sampling calorimeter designed for providing precise measurements of the electromagnetic (EM) object pseudo rapidity up to 2.5 and hadronic object in the forward region

  • Electronics developments are pursued for the trigger readout of the ATLAS LiquidArgon Calorimeter towards the Phase-I upgrade scheduled in the LHC shut-down period of 2019-2020

  • Precise measurement and triggering EM object are very important for the physics at LHC, as one can recognize it from the fact that the Higgs discovery has been established with two photons and the four lepton final states

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Summary

Introduction

ATLAS Liquid-Argon Calorimeter (LAr) is a sampling calorimeter designed for providing precise measurements of the electromagnetic (EM) object pseudo rapidity up to 2.5 and hadronic object in the forward region. Electronics developments are pursued for the trigger readout of the ATLAS LiquidArgon Calorimeter towards the Phase-I upgrade scheduled in the LHC shut-down period of 2019-2020. The ATLAS LAr Calorimeter readout electronics will be upgraded in two stages, Phase-1 and Phase2.

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