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LArCaloPublicStableBeam2022

Introduction

Approved plots that can be shown by ATLAS speakers at conferences and similar events. Please do not add figures on your own. Contact the responsible LAr project leader in case of questions and/or suggestions.

The Liquid Argon Calorimeter performance plots displayed here were obtained using LHC stable beam collision events recorded by ATLAS in 2022 at an injection energy of 6.8 TeV per beam.

LAr Cell Coverage

LAr cell energy sums (without FCal) distributed in a hypothetical tower grid with Δη x Δφ = 0.025 x 0.025 for 137 proton-proton collision events at √s = 13.6 TeV in Run 427394 from 5-6 July 2022 triggered by the LAr calorimeter (L1Calo). From left to right the plots show the summed energies in the endcap C, in the barrel and in the endcap A. The relative small number of events triggered in this run allows to observe individual particle showers as regions with a few cells at high energies (red) in the core surrounded by a halo of cells with lower energy (blue and green).

L1Calo_427394_LArECC_prelim.png
eps version, pdf version
L1Calo_427394_LArEB_prelim.png
eps version, pdf version
L1Calo_427394_LArECA_prelim.png
eps version, pdf version

LAr cell energy sums (without FC) distributed in a hypothetical tower grid with Δη x Δφ = 0.025 x 0.025 for 9161 proton-proton collision events at √s = 13.6 TeV in run 427514 from 7 July 2022 triggered by the LAr calorimeter (L1Calo). From left to right the plots show the summed energies in the endcap C, in the barrel and in the endcap A. The number of events triggered in this run was large enough to obtain a smooth coverage of individual particle showers over the entire phase-space displayed. One region in the endcap A (2.1 < η < 2.3, 0.785 < φ < 0.982) shows less energy than expected due to trigger inefficiency.

L1Calo_427514_LArECC_prelim.png
eps version, pdf version
L1Calo_427514_LArEB_prelim.png
eps version, pdf version
L1Calo_427514_LArECA_prelim.png
eps version, pdf version

FEB Offset Timing

Average time per front end board (FEB) in the LAr electromagnetic barrel (EMB) collected with the first stable beam collision data at √s = 13.6 TeV, taken in early July 2022. The average time for one FEB is the result of a Gaussian fit on the time distribution from pulses reconstructed from medium and high gain for all channels of this FEB. All FEBs are well aligned since the distribution is centred at zero and no significant outliers are observed.

Timing_EMB.png
eps version, pdf version

Average time per front end board (FEB) in the LAr electromagnetic end-cap (EMEC) collected with the first stable beam collision data at √s = 13.6 TeV, taken in early July 2022. The average time for one FEB is the result of a Gaussian fit on the time distribution from pulses reconstructed from medium and high gain for all channels of this FEB. All FEBs are well aligned since the distribution is centred at zero and no significant outliers are observed.

Timing_EMEC.png
eps version, pdf version

Average time per front end board (FEB) in the LAr hadronic end-cap (HEC) collected with the first stable beam collision data at √s = 13.6 TeV, taken in early July 2022. The average time for one FEB is the result of a Gaussian fit on the time distribution from pulses reconstructed from medium and high gain for all channels of this FEB. All FEBs are well aligned since the distribution is centred at zero and no significant outliers are observed.

Timing_HEC.png
eps version, pdf version

Average time per front end board (FEB) in the LAr forward calorimeter (FCal) collected with the first stable beam collision data at √s = 13.6 TeV, taken in early July 2022. The average time for one FEB is the result of a Gaussian fit on the time distribution from pulses reconstructed from medium and high gain for all channels of this FEB. All FEBs are well aligned since the distribution is centred at zero and no significant outliers are observed.

Timing_FCAL.png
eps version, pdf version

Energy comparison digital trigger and main readouts

The measured Super Cells (SC) transverse momentum ET using data collected with the first stable beam proton-proton collision at √s = 13.6 TeV from Run 427405, computed on LATOME in real time from the middle layer of the LAr Electromagnetic Barrel (EMB), excluding not well calibrated SCs, are compared to the summed transverse momentum from their constituent calorimeter cells, obtained through the main readout path. Preliminary calibration constants are used without adjusting the phase of the pulse. A reasonable agreement is observed between the two readouts.

ev_et_VS_sum_mainEt_00427405_Pavol100_v4_EMB.png
eps version, pdf version

The measured Super Cells (SC) transverse momentum ET using data collected with the first stable beam proton-proton collision at √s = 13.6 TeV from Run 427405, computed on LATOME in real time from the middle layer of the LAr Electromagnetic Endcap (EMEC), excluding not well calibrated SCs, are compared to the summed transverse momentum from their constituent calorimeter cells, obtained through the main readout path. Preliminary calibration constants are used without adjusting the phase of the pulse. A reasonable agreement is observed between the two readouts.

ev_et_VS_sum_mainEt_00427405_Pavol100_v4_EMEC.png
eps version, pdf version

The measured Super Cells (SC) transverse momentum ET using data collected with the first stable beam proton-proton collision at √s = 13.6 TeV from Run 427405, computed on LATOME in real time from the middle layer of the LAr Electromagnetic Barrel (EMB), excluding not well calibrated SCs, are compared to the summed transverse momentum from their constituent calorimeter cells, obtained through the main readout path. Preliminary calibration constants are used without adjusting the phase of the pulse. A reasonable agreement is observed between the two readouts.

reldiff_ev_et_sum_main00427405_v4_EMB.png
eps version, pdf version

The measured Super Cells (SC) transverse momentum ET using data collected with the first stable beam proton-proton collision at √s = 13.6 TeV from Run 427405, computed on LATOME in real time from the middle layer of the LAr Electromagnetic Endcap (EMEC), excluding not well calibrated SCs, are compared to the summed transverse momentum from their constituent calorimeter cells, obtained through the main readout path. Preliminary calibration constants are used without adjusting the phase of the pulse. A reasonable agreement is observed between the two readouts.

reldiff_ev_et_sum_main00427405_v4_EMEC.png
eps version, pdf version

LAr Super Cells Pulse Shapes

Measured pulse shape of a Super Cell in the LAr Electromagnetic Barrel (EMB) from the digital trigger readout collected with the first stable beam collision data at √s = 13.6 TeV from Run 427394 taken in early July 2022 (blue dots), compared to the expected physics pulse shape (grey line). The expected physics pulse shape is extracted using preliminary conversion parameters from a calibration pulse obtained with an injected calibration charge. The measured pulse for this Super Cell is obtained by averaging over several signals. The signal amplitudes are presented after subtracting the pedestal and are normalised to unit amplitude.

signal_run427394_evt-1_ch943277568-2.png
eps version, pdf version

Measured pulse shape of a Super Cell in the LAr Electromagnetic Endcap (EMEC) from the digital trigger readout collected with the first stable beam collision data at √s = 13.6 TeV from Run 427394 taken in early July 2022 (blue dots), compared to the expected physics pulse shape (grey line). The expected physics pulse shape is extracted using preliminary conversion parameters from a calibration pulse obtained with an injected calibration charge. The measured pulse for this Super Cell is obtained by averaging over several signals. The signal amplitudes are presented after subtracting the pedestal and are normalised to unit amplitude.

signal_run427394_evt-1_ch989928448-2.png
eps version, pdf version

Measured pulse shape of a Super Cell in the LAr Hadronic Endcap (HEC) from the digital trigger readout collected with the first stable beam collision data at √s = 13.6 TeV from Run 427394 taken in early July 2022 (blue dots), compared to the expected physics pulse shape (grey line). The expected physics pulse shape is extracted using preliminary conversion parameters from a calibration pulse obtained with an injected calibration charge. The measured pulse for this Super Cell is obtained by averaging over several signals. The signal amplitudes are presented after subtracting the pedestal and are normalised to unit amplitude.

signal_run427394_evt-1_ch984704000-2.png
eps version, pdf version

Measured pulse shape of a Super Cell in the Forward Calorimeter (FCal) from the digital trigger readout collected with the first stable beam collision data at √s = 13.6 TeV from Run 427394 taken in early July 2022 (blue dots), compared to the expected physics pulse shape (grey line). The expected physics pulse shape is extracted using preliminary conversion parameters from a calibration pulse obtained with an injected calibration charge. The measured pulse for this Super Cell is obtained by averaging over several signals. The signal amplitudes are presented after subtracting the pedestal and are normalised to unit amplitude.

signal_run427394_evt-1_ch993067008-2.png
eps version, pdf version

LAr Super Cells Baseline Shift Performance

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of presampler supercells in the Electromagnetic Barrel at η = −1.4. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 2460 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 2.1 (-2.3) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_emb_0.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of front layer supercells in the Electromagnetic Barrel at η = −0.035. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 2560 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 0.33 (-0.40) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_emb_1.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of middle layer supercells in the Electromagnetic Barrel at η = −1.3875. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 480 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 0.78 (-0.89) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_emb_2.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of front layer supercells in the Electromagnetic Endcap at η = 3.0. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 340 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 6.4 (-6.2) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_emec_1.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of middle layer supercells in the Electromagnetic Endcap at η = 3.15. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 340 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 6.4 (-6.2) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_emec_2.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of layer 1 supercells in the FCAL at η = −3.9727. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 200 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 16.1 (-16.7) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey for an empty bunch.

lbc_fcal_1.png
eps version, pdf version

Measurement of baseline shift on ATLAS Liquid Argon Calorimeterís digital trigger system as a function of the Bunch Crossing IDentifier (BCID) of layer 2 supercells in the FCAL at η = −4.1741. Data collected on Oct. 10th 2022 at an average instantaneous luminosity of 1.84 ◊ 1034 cm−2 s−1 in stable beam condition. Each point averages about 320 ADC samples recorded in 110 consecutive minutes. The maximum (minimum) baseline shift observed is 9.8 (-10.1) ADC counts. Only a subset of 600 out of 3564 BCIDs are displayed. Marker colours indicate the LHC bunch structure, red indicating a filled bunch and grey an empty bunch.

lbc_fcal_2.png
eps version, pdf version


Major updates:
-- KonieAlKhoury - 2022-07-26

Responsible: KonieAlKhoury
Subject: LAr Public Plots 2022 Stable Beam Collisions at 13.6 TeV

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Topic attachments
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PDFpdf Timing_FCAL.pdf r1 manage 14.2 K 2022-07-26 - 10:43 KonieAlKhoury  
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