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Public ATLAS Luminosity Results for Run-3 of the LHC

Introduction

Here results related to ATLAS luminosity measurements in Run-3 are given. For Run-2 results, please see Luminosity Results for Run-2 (2015-2018). For Run-1 results, please see Luminosity Results for Run-1 (2010-2012).

Online Luminosity Summary Plots for Run3

Multi-year Summary Plots

These plots are based on the online luminosity estimate for 2022. For previous years, the best luminosity estimate available has been used.

Delivered Luminosity versus time for 2011-2022 (p-p data only)
Cumulative luminosity versus day delivered to ATLAS during stable beams and for high energy p-p collisions.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/intlumivsyear.png
pdf file
Total Integrated Luminosity in Run 2 (13 TeV p-p data only) and Run 3 (13.6 TeV p-p data only)
Cumulative luminosity versus time delivered to ATLAS (green) and recorded by ATLAS (yellow) during stable beams for p-p collisions at 13 TeV centre-of-mass energy in LHC Run 2 and 13.6 TeV centre-of-mass energy in LHC Run 3. A version showing just the delivered luminosity (green) is also available as pdf and png for making overlay animations.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/intlumivstimeRun3.png
pdf file

2022 p-p data taking

These plots show the estimated integrated luminosity with an initial calibration for the 2022 data.

Total Integrated Luminosity in 2022
Cumulative luminosity versus time delivered to (green) and recorded by ATLAS (yellow) during stable beams for p-p collisions at 13.6 TeV centre-of-mass energy in 2022. The delivered luminosity accounts for luminosity delivered from the start of stable beams until the LHC requests ATLAS to put the detector in a safe standby mode to allow for a beam dump or beam studies. The recorded luminosity reflects the DAQ inefficiency, as well as the inefficiency of the so-called ‘warm start’: when the stable beam flag is raised, the tracking detectors undergo a ramp of the high-voltage and, for the pixel system, turning on the preamplifiers. The luminosity shown represents an initial 13.6 TeV luminosity calibration estimate based on beam-separation scans taken in early 2022.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/sumLumiByDay.png
pdf file
Integrated Luminosity by Day in 2022
Integrated luminosity per day time delivered to (green) and recorded by ATLAS (yellow) during stable beams for p-p collisions at 13.6 TeV centre-of-mass energy in 2022. The data shown is identical to the data shown above, except not cumulative over the year.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/lumiByDay.png
pdf file
Peak Luminosity per Fill in 2022
The peak instantaneous luminosity delivered to ATLAS during stable beams for p-p collisions at 13.6 TeV centre-of-mass energy is shown for each LHC fill as a function of time in 2022. The luminosity is determined using counting rates measured by the luminosity detectors, and is based on an initial 13.6 TeV luminosity calibration estimate from beam-separation scans taken in early 2022.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/peakLumiByFill.png
pdf file
Peak Interactions per Crossing in 2022
The maximum number of inelastic collisions per beam crossing (µ) during stable beams for p-p collisions at 13.6 TeV centre-of-mass energy is shown for each fill in 2022. The preliminary luminosity measurement is used to determine the number of interactions per beam crossing as µ = Lbunch x σinel / fr where Lbunch is the per-bunch instantaneous luminosity, σinel is the inelastic cross-section at 13.6 TeV, which is taken to be 80 mb, and fr is the LHC revolution frequency of 11.245 kHz. The number of interactions shown is averaged over all colliding bunch pairs, and only the peak value per fill during stable beams is shown.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/peakMuByFill.png
pdf file
Colliding Bunches in 2022
The number of colliding bunches during stable beams for p-p collisions at 13.6 TeV centre-of-mass energy is shown for each LHC fill as a function of time in 2022.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/collidingByFill.png
pdf file
Bunch Charge in 2022
The average number of protons contained in colliding bunches at the start of stable beams for p-p collisions at 13.6 TeV centre-of-mass energy is shown for each LHC fill as a function of time in 2022. The bunch charge per BCID is provided by the LHC from the Fast Bunch Current Transformer (FBCT).
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/bunchChargeByFill.png
pdf file
Beam Charge in 2022
The total number of protons contained in colliding bunches at the start of stable beams for p-p collisions at 13.6 TeV centre-of-mass energy is shown for each LHC fill as a function of time in 2022. The value shown is the average of the two beams. The bunch charge per BCID is provided by the LHC from the Fast Bunch Current Transformer (FBCT).
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/beamChargeByFill.png
pdf file
Total Stable Beam Time by Day in 2022
Total Stable Beams Time - shown is the amount of time in stable beams during p-p collisions at 13.6 TeV centre-of-mass energy delivered by the LHC each calendar day integrated over 2022. Also shown is the stable beams time multiplied by the L1 livefraction to show the amount of stable beams time recorded by ATLAS.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/sumTimeByDay.png
pdf file
Stable Beam Time in 2022
Stable Beams Time per day - shown is the amount of time in stable beams during p-p collisions at 13.6 TeV centre-of-mass energy delivered by the LHC for each calendar day. Also shown is the stable beams time multiplied by the L1 livefraction to show the amount of stable beams time recorded by ATLAS.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/timeByDay.png
pdf file

ATLAS Recording Efficiency

Cumulative Recording efficiency versus Luminosity for 2011-2022 (p-p data only)
Cumulative recording efficiency (efficiency for all data recorded in that year up to that point in time) is shown for each year as a function of integrated luminosity delivered in that year. The recording efficiency is the luminosity recorded by ATLAS divided by luminosity delivered by the LHC during stable beams. The recorded luminosity reflects the DAQ inefficiency, as well as the inefficiency of the so-called ‘warm start’: when the stable beam flag is raised, the tracking detectors undergo a ramp of the high-voltage and, for the pixel system, turning on the preamplifiers. Cumulative luminosity versus day delivered to ATLAS during stable beams and for high energy p-p collisions.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/inteffvslumi.png
pdf file
Cumulative Recording efficiency versus Time for 2011-2022 (p-p data only)
Cumulative recording efficiency (efficiency for all data recorded in that year up to that point in time) is shown for each year as a function of integrated luminosity delivered in that year. The recording efficiency is the luminosity recorded by ATLAS divided by luminosity delivered by the LHC during stable beams. The recorded luminosity reflects the DAQ inefficiency, as well as the inefficiency of the so-called ‘warm start’: when the stable beam flag is raised, the tracking detectors undergo a ramp of the high-voltage and, for the pixel system, turning on the preamplifiers. Cumulative luminosity versus day delivered to ATLAS during stable beams and for high energy p-p collisions.
https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/PublicPlots/2022/DataSummary/figs/inteffvsyear.png
pdf file


Major updates:
-- EricTorrence - 2022-09-01

Responsible: EricTorrence
Subject: public

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