Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger

  title={Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger},
  author={Atlas Collaboration},
The PreProcessor of the ATLAS Level-1 Calorimeter Trigger prepares the analogue trigger signals sent from the ATLAS calorimeters by digitising, synchronising and calibrating them to reconstruct transverse energy deposits, which are then used in further processing to identify event features. During the first long shutdown of the LHC from 2013 to 2014, the central components of the PreProcessor, the Multichip Modules, were replaced by upgraded versions that feature modern ADC and FPGA technology… Expand
Configuration and performance of the ATLAS $b$-jet triggers in Run 2
Several improvements to the ATLAS triggers used to identify jets containing b-hadrons (b-jets) were implemented for data-taking during Run 2 of the Large Hadron Collider from 2016 to 2018. TheseExpand
Nanosecond machine learning event classification with boosted decision trees in FPGA for high energy physics
This work presents a novel implementation of classification using the machine learning/artificial intelligence method called boosted decision trees (BDT) on field programmable gate arrays (FPGA) and aims to provide decisions at the lowest latency values for real-time event classification. Expand


The ATLAS Level-1 Calorimeter Trigger: PreProcessor implementation and performance
The PreProcessor system of the ATLAS Level-1 Calorimeter Trigger receives about 7200 analogue signals from the electromagnetic and hadronic components of the calorimetric detector system, and its hardware realisation, functionality, and performance are described. Expand
Analog system for building the first-level triggering signal provided by the hadronic calorimeter of ATLAS detector
Abstract The trigger summing system for the hadronic calorimeter of ATLAS is described. This analog summing system aims at building the trigger tower signals, which are used by the first levelExpand
Performance of the ATLAS trigger system in 2015
  • Scoap
  • Computer Science
  • 2017
This paper presents a short overview of the changes to the trigger and data acquisition systems during the first long shutdown of the LHC and shows the performance of the trigger system and its components based on the 2015 proton–proton collision data. Expand
Pile-Up Suppression in the ATLAS Level 1 Calorimeter Trigger and Searches for Higgs Boson Pair Production
The Preprocessor system of the ATLAS Level 1 Calorimeter Trigger processes analogue signals from the 7168 trigger towers in the electromagnetic and hadronic calorimeters. Almost all of the processingExpand
Monitoring and data quality assessment of the ATLAS liquid argon calorimeter
The liquid argon calorimeter is a key component of the ATLAS detector installed at the CERN Large Hadron Collider. The primary purpose of this calorimeter is the measurement of electron and photonExpand
Signal processing considerations for liquid ionization calorimeters in a high rate environment
Abstract We present the results of a study of the effects of thermal and pileup noise in liquid ionization calorimeters operating in a high luminosity environment. The method of optimal filtering ofExpand
Performance of the ATLAS Trigger System in 2010
Proton–proton collisions at $\sqrt{s}=7$ TeV and heavy ion collisions at $\sqrt{s_{NN}}=2.76$ TeV were produced by the LHC and recorded using the ATLAS experiment’s trigger system in 2010. The LHC isExpand
During LHC Run 2, the LHC machine configuration evolved significantly. Starting from a very careful approach in 2015, with the priority on stability and ease of commissioning, where the limits ofExpand
The performance of the jet trigger for the ATLAS detector during 2011 data taking
The performance of the jet trigger for the ATLAS detector at the LHC during the 2011 data taking period is described and was fully efficient for jets with transverse energy above 25 GeV for triggers seeded randomly at Level 1. Expand
Performance of the ATLAS muon trigger in pp collisions at s=8 TeV
The performance of the ATLAS muon trigger system is evaluated with proton–proton collision data collected in 2012 at the Large Hadron Collider at a centre-ofmass energy of 8 TeV. It is primarilyExpand