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LArCaloPublicBeamSplashMay2022

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 with LHC collision configuration from splash events recorded in ATLAS in May 2022, to check that the detector is ready for collisions. The plots presented show the LAr cells energy coverage and the distribution of the timing alignment for all the LAr FEBs. In addition the Super Cells timing uniformity as well as the LAr Timing Uniformity in beam splash events are presented.

LAr Cell Coverage

LAr cell energies (without FCal) summed in a hypothetical tower grid with Δη x Δφ = 0.025 x 0.025 for a beam splash event from May 2022. 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 detectors recorded 0.844 PeV in this event. The visible regular eight-fold pattern in φ stems from the material in the endcap toroid magnet shadowing the incoming particles.

r420624_lb477_evt559680_LArECC_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArEB_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArECA_prelim.png
eps version, pdf version

LAr cell energies in the Forward Calorimeter (FCal) modules for a beam splash event from May 2022. 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 1.538 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.

r420624_lb477_evt559680_LArFCalA1_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArFCalA2_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArFCalA3_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArFCalC1_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArFCalC2_prelim.png
eps version, pdf version
r420624_lb477_evt559680_LArFCalC3_prelim.png
eps version, pdf version

LAr cell energies (without FCal) summed in a hypothetical tower grid with Δη x Δφ = 0.025 x 0.025 for a beam splash event from May 2022. 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 detectors recorded 0.792 PeV in this event. The visible regular eight-fold pattern in φ stems from the material in the endcap toroid magnet shadowing the incoming particles.

r420624_lb1080_evt622167_LArECC_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArEB_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArECA_prelim.png
eps version, pdf version

LAr cell energies in the Forward Calorimeter (FCal) modules for a beam splash event from May 2022. 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 1.445 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.

r420624_lb1080_evt622167_LArFCalA1_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArFCalA2_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArFCalA3_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArFCalC1_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArFCalC2_prelim.png
eps version, pdf version
r420624_lb1080_evt622167_LArFCalC3_prelim.png
eps version, pdf version

FEB Offset Timing

Average time per front end board (FEB) in the LAr electromagnetic barrel (EMB) with splash data from Beam 1 (B1) entering from the positive η (A) side collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_EMB_070522_B1_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr electromagnetic end-cap (EMEC) with splash data from Beam 1 (B1) entering from the positive η (A) collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_EMEC_070522_B1_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr hadronic end- cap (HEC) with splash data from Beam 1 (B1) entering from the positive η (A) collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_HEC_070522_B1_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr forward calorimeter (FCal) with splash data from Beam 1 (B1) entering from the positive η (A) collected during May 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. using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_FCAL_070522_B1_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr electromagnetic barrel (EMB) with splash data from Beam 2 (B2) entering from the negative η (C) collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_EMB_070522_B2_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr electromagnetic end-cap (EMEC) with splash data from Beam 2 (B2) entering from the negative η (C) collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_EMEC_070522_B2_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr hadronic end- cap (HEC) with splash data from Beam 2 (B2) entering from the negative η (C) collected during May 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. The system was aligned using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_HEC_070522_B2_TOF_prelim.png
eps version, pdf version

Average time per front end board (FEB) in the LAr forward calorimeter (FCal) with splash data from Beam 2 (B2) entering from the negative η (C) collected during May 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. using beam splash events from beam 1 (from side A to side C) and accounting for the time of flight of particles traveling parallel to the beam axis. This time alignment will be further tuned to improve the uniformity using collision events.

Timing_FCAL_070522_B2_TOF_prelim.png
eps version, pdf version

LAr Timing Uniformity

Cell time distribution as a function of η in beam splash events from ATLAS Run 420624 selected by calorimeter triggers using the energy deposits in Endcap C (negative η) with the particles delivered by LHC Beam 1 (B1) and entered from the positive η (A) side. 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.

B1splashes7_5_22.png
eps version, pdf version

Cell time distribution as a function of η in beam splash events from ATLAS Run 420624 selected by calorimeter triggers using the energy deposits in Endcap A (positive η) with the particles delivered by LHC Beam 2 (B2) and entered from the negative η (C) side. The LAr calorimeter was operated in 32-sample readout mode and an Optimal Filtering Coefficient (OFC) iteration procedure was applied to identify the 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.

B2splashes7_5_22.png
eps version, pdf version

Cell time distribution as a function of η in beam splash events from ATLAS Run 420624 selected by calorimeter triggers using either the energy deposits in either positive η (A) or negative (C) 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.

combinedSplashes7_5_22-2.png
eps version, pdf version

LAr Super Cells Timing Uniformity

The super cell timing uniformity, tuned at the BCID level, for the LAr detectors as a function of η. The data are from events of the beam splash ATLAS Run 420624 with the particles delivered by LHC Beam 1 (B1) and entered from the positive η (A) side. Only super cells which are not saturated are seleted. The timing is not corrected to account for the time of flight of particles.

run420624_beam1_public.png
eps version, pdf version

The super cell timing uniformity, tuned at the BCID level, for the LAr detectors as a function of η. The data are from events of the beam splash ATLAS Run 420624 with the particles delivered by LHC Beam 2 (B2) and entered from the negative η (C) side. Only super cells which are not saturated are seleted. The timing is not corrected to account for the time of flight of particles.

run420624_beam2_public.png
eps version, pdf version


Major updates:
-- KonieAlKhoury - 2022-06-07

Responsible: KonieAlKhoury
Subject: LAr Public Plots 2021Pilot Beam

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