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LArCaloPublicPilotBeam2021

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 plots presented here show the Liquid Argon Calorimeters performance plots obtained from splahes and test collision events recorded in ATLAS in October 2021 at the injection energy of 450 GeV per beam delivered to ATLAS during the LHC pilot beam test.

Digital Trigger and Main Readout Energy Comparison

The measured supercell (SC) transverse energies (ET) from all layers of the LAr Electromagnetic Barrel (EMB) and Electromagnetic Endcaps (EMEC) are compared to the summed transverse energies from their constituent calorimeter cells, obtained through the main readout path. The data are from a single event of a beam splash run, where energy calculations are performed offline using optimal filtering with preliminary calibration constants. A good agreement is observed between the two readouts, as indicated by the y=x diagonal red line.

Main_vs_SWRod_lb322_l1id24_v10.png
eps version, pdf version

LAr Cell Coverage (Energy sums)

LAr cell energy sums (without FCal) distributed in a hypothetical tower grid with Δη x Δφ = 0.025x0.025 for a beam splash event from October 2021. The particles were delivered by Beam 1 (B1) and entered from the positive η (A) side. From left to right the plots show the summed energies in the endcap C, in the barrel and in the endcap A. In total the displayed LAr layers recorded 1.303 PeV in this event.

r405495_lb360_evt50896_LArECC_prelim.png
eps version, pdf version
r405495_lb360_evt50896_LArEB_prelim.png
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r405495_lb360_evt50896_LArECA_prelim.png
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LAr cell energies in the Forward Calorimeter (FCal) modules for a beam splash event from October 2021. The particles were delivered by Beam 1 (B1) and entered from the positive η (A) side. From left to right the plots show the energies in the first, second and third module, counted as seen from the centre of the detector. In the upper row for the A-side and in the lower row for the C-side. In total the displayed LAr layers recorded 1.723 PeV in this event. Many cells saturated the electronics readout and are visible as areas with either too low or too high energy like in the inner regions of the A-side modules.

r405495_lb360_evt50896_LArFCalA1_prelim.png
eps version, pdf version
r405495_lb360_evt50896_LArFCalA2_prelim.png
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r405495_lb360_evt50896_LArFCalA3_prelim.png
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r405495_lb360_evt50896_LArFCalC1_prelim.png
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r405495_lb360_evt50896_LArFCalC2_prelim.png
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r405495_lb360_evt50896_LArFCalC3_prelim.png
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LAr cell energy sums (without FCal) distributed in a hypothetical tower grid with Δη x Δφ = 0.025x0.025 for a beam splash event from October 2021. The particles were delivered by Beam 2 (B2) and entered from the negative η (C) side. From left to right the plots show the summed energies in the endcap C, in the barrel and in the endcap A. In total the displayed LAr layers recorded 1.187 PeV in this event.

r405495_lb539_evt58774_LArECC_prelim.png
eps version, pdf version
r405495_lb539_evt58774_LArEB_prelim.png
eps version, pdf version
r405495_lb539_evt58774_LArECA_prelim.png
eps version, pdf version

LAr cell energies in the Forward Calorimeter (FCal) modules for a beam splash event from October 2021. The particles were delivered by Beam 2 (B2) and entered from the negative η (C) side. From left to right the plots show the energies in the first, second and third module, counted as seen from the centre of the detector. In the upper row for the A-side and in the lower row for the C-side. In total the displayed LAr layers recorded 1.294 PeV in this event. Many cells saturated the readout electronics and are visible as areas with either too low or too high energy like in the inner regions of the C-side modules.

r405495_lb539_evt58774_LArFCalA1_prelim.png
eps version, pdf version
r405495_lb539_evt58774_LArFCalA2_prelim.png
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r405495_lb539_evt58774_LArFCalA3_prelim.png
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r405495_lb539_evt58774_LArFCalC1_prelim.png
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r405495_lb539_evt58774_LArFCalC2_prelim.png
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r405495_lb539_evt58774_LArFCalC3_prelim.png
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FEB Offset Timing

Average time per front end board (FEB) in the LAr electromagnetic barrel (EMB) with collision data at s1/2 = 900 GeV collected during LHC pilot beam of October 2021. 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. The system was aligned with respect to the barrel side A using beam splash events. This preliminary time alignment will be further tuned to improve the uniformity and the observed residual bias.

Timing_EMB.png
eps version, pdf version

Average time per front end board (FEB) in the LAr electromagnetic end-cap (EMEC) with collision data at s1/2 = 900 GeV collected during LHC pilot beam of October 2021. 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. The system was aligned using beam splash events from beam 2 (from side C to side A) and not accounting for the shift of 3.1 m of the side C, causing a misalignment between side A and side C. This preliminary time alignment will be further tuned to improve the uniformity and the observed residual bias.

Timing_EMEC.png
eps version, pdf version

Average time per front end board (FEB) in the LAr hadronic end- cap (HEC) with collision data at s1/2 = 900 GeV collected during LHC pilot beam of October 2021. 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. The system was aligned using beam splash events from beam 2 (from side C to side A) and not accounting for the shift of 3.1 m of the side C, causing a misalignment between side A and side C. This preliminary time alignment will be further tuned to improve the uniformity and the observed residual bias.

Timing_HEC.png
eps version, pdf version

Average time per front end board (FEB) in the LAr forward calorimeter (FCal) with collision data at s1/2 = 900 GeV collected during LHC pilot beam of October 2021. 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. The system was aligned using beam splash events from beam 2 (from side C to side A) and not accounting for the shift of 3.1 m of the side C, causing a misalignment between side A and side C. This preliminary time alignment will be further tuned to improve the uniformity and the observed residual bias.

Timing_FCAL.png
eps version, pdf version

LAr Timing Uniformity

Cell time distribution as a function of η in beam splash events from ATLAS Run 405495 selected by calorimeter triggers using the energy deposits in Endcap C (negative η) with the particles delivered by LHC Beam 1 (B1) entering from the Endcap A side (positive η). The LAr calorimeter was operated in 32-sample readout mode and an Optimal Filtering Coefficient (OFC) iteration procedure was applied to identify the particle arrival time. Only cells for which the OFC iteration procedure has converged are used. Further requirements on the pulse quality and minimum deposited energy are applied. The cell time was adjusted to account for the time of flight of particles traveling parallel to the beam axis and to correct for the Endcap C being in the open position (Δz=3100 mm).

B1.png
eps version, pdf version

Cell time distribution as a function of η in beam splash events from ATLAS Run 405495 selected by calorimeter triggers using the energy deposits in Endcap A (positive η) with the particles delivered by LHC Beam 2 (B2) entering from the Endcap C side (negative η). The LAr calorimeter was operated in 32-sample readout mode and an Optimal Filtering Coefficient (OFC) iteration procedure was applied to identify the particle arrival time. Only cells for which the OFC iteration procedure has converged are used. Further requirements on the pulse quality and minimum deposited energy are applied. The cell time was adjusted to account for the time of flight of particles traveling parallel to the beam axis and to correct for the Endcap C being in the open position (Δz=3100 mm).

B2.png
eps version, pdf version

Cell time distribution as a function of η in beam splash events from ATLAS Run 405495 selected by calorimeter triggers using either the energy deposits in either Endcap A (positive η) or Endcap C (negative η). The particles entered from the side opposite to the one used for the trigger. The LAr calorimeter was operated in 32-sample readout mode and an Optimal Filtering Coefficient (OFC) iteration procedure was applied to identify the peaking time of the pulse. Only cells for which the OFC iteration procedure has converged are used. Further requirements on the pulse quality and minimum deposited energy are applied. The cell time was adjusted to account for the time of flight of particles traveling parallel to the beam axis and to correct for the Endcap C being in the open position (Δz=3100 mm).

combined.png
eps version, pdf version

LAr Super Cells Timing Uniformity

The super cell time distribution, tuned at the BCID level, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC), the LAr Hadronic Endcap (HEC) and the LAr Forward Calorimeter (FCal) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 1 (from side A to side C). Prior to taking the data, a preliminary BCID alignement was performed using cosmic and calibration data. This level of alignment is expected to be 2 BCID in the central region and up to 10 in the outer region.

EtaVsT_Beam1_unsat_lowE_prelim_log.png
eps version, pdf version

The super cell time distribution, tuned at the BCID level, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC), the LAr Hadronic Endcap (HEC) and the LAr Forward Calorimeter (FCal) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 2 (from side C to side A). Prior to taking the data, a preliminary BCID alignement was performed using cosmic and calibration data. This level of alignment is expected to be 2 BCID in the central region and up to 10 in the outer region.

EtaVsT_Beam2_unsat_lowE_prelim_log.png
eps version, pdf version

The super cell time distribution, tuned at the BCID level, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC), the LAr Hadronic Endcap (HEC) and the LAr Forward Calorimeter (FCal) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 1 (from side A to side C) and Beam 2 (from side C to side A). Prior to taking the data, a preliminary BCID alignment was performed using cosmic and calibration data. This level of alignement is expected to be 2 BCID in the central region and up to 10 in the outer region.

EtaVsT_Beam12_unsat_lowE_prelim_log.png
eps version, pdf version

LAr Super Cells Offline Reconstructed Timing

The super cell τ distribution, corresponding to the time difference between the measured and the expected position of the pulse, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC) and the LAr Hadronic Endcap (HEC) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 1 (from side A to side C). An offline calculation using optimal filtering (OFC) with preliminary calibration constants was performed to calculate the timing. In addition, an OFC iteration procedure is performed to find the most optimal OFC phase using the first event in the Run and applied to the second event to have a flat distribution.

EtaTau_B1_fin30_prelim.png
eps version, pdf version

The super cell τ distribution, corresponding to the time difference between the measured and the expected position of the pulse, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC) and the LAr Hadronic Endcap (HEC) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 2 (from side C to side A). An offline calculation using optimal filtering (OFC) with preliminary calibration constants was performed to calculate the timing. In addition, an OFC iteration procedure is performed to find the most optimal OFC phase using the first event in the Run and applied to the second event to have a flat distribution.

EtaTau_B2_fin30_prelim.png
eps version, pdf version

The super cell τ distribution, corresponding to the time difference between the measured and the expected position of the pulse, for the LAr Electromagnetic Barrel (EMB), the Electromagnetic Endcaps (EMEC) and the LAr Hadronic Endcap (HEC) as a function of η. The data are from events of the beam splash ATLAS Run 405495 with the particles delivered by LHC Beam 1 (from side A to side C) and Beam 2 (from side C to side A). An offline calculation using optimal filtering (OFC) with preliminary calibration constants was performed to calculate the timing. In addition, an OFC iteration procedure is performed to find the most optimal OFC phase using the first event in the Run and applied to the second event to have a flat distribution.

EtaTau_B1B2_fin30_prelim.png
eps version, pdf version

Major updates:
-- KonieAlKhoury - 2021-11-16

Responsible: KonieAlKhoury
Subject: LAr Public Plots 2021Pilot Beam

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