Abstract
Liquid argon (LAr) sampling calorimeters are employed by ATLAS for all electromagnetic calorimetry in the pseudo-rapidity region η < 3.2, and for hadronic and forward calorimetry in the region from η = 1.5 to η = 4.9. In the first LHC run (Run-1), a total luminosity of around 26 fb-1 was collected at centre-of-mass energies of 7-8 TeV. After detector consolidation during a long shut-down, Run-2 started in 2015 and around 150 fb-1 of data at a centre-of-mass energy of 13 TeV was recorded. With the end of Run-2 in 2018, a multi-year shutdown for the Phase-I detector upgrades began. As part of the Phase-I upgrade, new trigger readout electronics of the ATLAS LAr Calorimeter have been developed. Installation be-gan at the start of the LHC shut down in 2019 and is expected to be completed in 2020. A commissioning cam-paign is underway in order to realise the capabilities of the new, higher granularity and higher precision level-1 trigger hardware in Run-3 data taking. This contribution will give an overview of the new trigger readout system and the ongoing commissioning and installation efforts.
Highlights
The ATLAS Liquid argon (LAr) calorimeter [3] is a sampling calorimeter with full coverage in azimuthal angle1
The LAr Digital Processing System (LDPS) consists of advanced mezzanine cards, named LAr Trigger prOcessing MEzzanines (LATOMEs), and Advanced-TCA (ATCA) LAr Carrier (LArC) blades with Rear Transition Module (RTM) cards and Intelligent Platform Management Controller (IPMC) mezzanine cards [9]
The LDPS consists of 116 LATOMEs and 30 LArCs distributed across three ATCA shelves
Summary
The ATLAS LAr calorimeter [3] is a sampling calorimeter with full coverage in azimuthal angle. The ATLAS LAr calorimeter [3] is a sampling calorimeter with full coverage in azimuthal angle1 It uses liquid argon as an active medium, with copper electrodes and various absorber materials (see Figure 1). Each section of the calorimeter is segmented in depth in up to three layers, referred to as front, middle and back. For |η| < 1.8, an additional ‘presampler’ layer provides measurements of energy lost upstream of the subdetector. The LAr calorimeter, with each of these technologies mirrored in the A and C sides of the detector, consists of 8 subsystems, referred to as ‘partitions’, namely EMBA, EMBC, EMECA, EMECC, HECA, HECC, FCalA and FCalC
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