Approved Forward Detector Performances Plots using MC or no-collision data

Introduction

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

ALFA figures

Multiplicity of tracks and (X,Y) plot of unique tracks. Data from 2008 test beam. Read out used was the Lund Motherboard.
Resolution in X and Y for tracks with at least 5 hits. To the right is the resolution as a function of the minimum numbers of hits per projection. Data from 2008 test beam. The Lund motherboard was used for read out.
Mean hit multiplicties of all layers .Results from 2008 test beam. The Orsay borad was used for read out.
Layer efficiency . Data from test beam 2008. Orsay board used for readout.
Resolution for a half detector configuration. 5U and 5V planes.Data from 2008 test beam. Orsay test board used for read out
ALFA resolution versus overlap region

LUCID figures

Posted on September 12th 2019
Current drawn from the LUCID power supply channel connected to the last PMT dynode, called Booster 3, of PMT A9. The data is displayed over a timespan of the whole 2018 data taking, showing the gradual degradation of the current drawn by the dynode during physics runs (the peaks). The 3-4 out-of-trend spikes towards the end of the year are due to HV tests done on the PMT after it was not used for datataking any more.
Total current drawn from the LUCID power supply channels connected to PMT C9, compared to C12. The data is displayed over a timespan of a few hours of data-taking, corresponding to ATLAS runs 352494, 352512, 352514 and 352607. In C12 the current drawn in the two fills is similar, while using C9 the second fill shows lower current and an additional instability at the beginning, displaying lower initial value. We have evidence supporting that this is due to a contact issue between the PMT and the Base that is generated by current and radiation.
Posted on June 18th 2018
Gain variation with respect to the first day of calibration in 2016. The PMT HV was corrected between collisions run aiming to keep Bi-207 signals average charge constant.
Gain variation with respect to the first day of calibration in 2017. The PMT HV was corrected between collisions run aiming to keep Bi-207 signals average amplitude constant.
HV applied to the PMTs as a function of cumulative luminosity delivered to the LHC from 2015 to 2017.
Plot of a single pulse in a LUCID PMT from the Bi-207 source in 2017.
LED calibration signal as monitored by the PIN-diode as a function of time in 2016.
Charge-amplitude ratio as a function of day in 2016.
HV applied to the PMTs as a function of integrated luminosity delivered from 2015-2017 for each year separately.
Variation in percent of the measured mean charge relative a reference run for one of the Bi-calibrated photomultipliers.
Transit time as a function of HV.
Plots from RUN2 approved on July 29th 2017
Plot of a single pulse in LUCID PMT 1 from the Bi-207 source in 2016.
Amplitude distribution for LUCID PMT 1 from a Bi-207 run in 2016 with a trigger threshold at 25 mV .
Amplitude distribution from a Bi-207 run in 2015 with trigger threshold at 12 mV.
Charge distribution for LUCID PMT 1 from a Bi-207 run in 2016 with trigger threshold at 25 mV. The charge is calculated as the integral of the pulses divided by 50 Ohm.
Amplitude distribution from a LED run in 2016. This data is triggered by an external pulse-generator and and not by an amplitude requirement as in the Bi-207 runs.
Amplitude distribution from a laser run in 2015 with a trigger threshold at 15 mV.
Amplitude distribution from a PIN diode in a LED calibration run in 2015.
The mean amplitude and charge in LUCID Bi-207 calibration runs for PMT 1 during 2016. The measurements are normalized so that it is one for the first measurement on the 1th of May 2016.
The average high voltage of the Bi-207 calibrated LUCID side A and side C detectors after being adjusted automatically by the Bi-207 calibration runs. The data is from 2016.
Posted before August 1st 2017
The number of photoelectrons predicted to be seen by LUCID from Cerenkov radiation created in both the gas and the window of the photomultiplier.
The number of photoelectrons predicted to be seen by LUCID from Cerenkov radiation created in only the gas.
The number of photoelectrons predicted to be seen by LUCID from Cerenkov radiation created in only the photomultiplier window.
Efficiency as a function of the discriminator threshold if at least one hit is required in LUCID.
Efficiency as a function of the discriminator threshold if at least one hit is required in each of the two LUCID detectors.
Difference between A- and C-side hit multiplicity if a hit on side A is required.
Difference between A- and C-side hit multiplicity if at least one hit in LUCID is required.
Difference between A- and C-side hit multiplicity if at least one hit in LUCID is required on both side A and side C.
The hit multiplicity distribution for a Monte Carlo sample without trigger requirement.
The hit multiplicity distribution for a Monte Carlo sample with a requirement of at least one hit in both side A and C.
The average number of hits as a function of discriminator threshold if at least one hit in LUCID is required.
The average number of hits as a function of discriminator threshold if at least one hit on both side A and C is required.
Event composition as a function of hit multiplicity.
Event composition as a function of hit multiplicity when requiring at least one hit on both side A and C.
The distribution of hit probability for different photo multipliers in LUCID when the OR trigger is used.
The distribution of hit probability for different photo multipliers in LUCID when the AND trigger is used.
The predicted hit multiplicity in LUCID when the OR trigger is used.
The predicted hit multiplicity in LUCID when the AND trigger is used.
The number of hits in the inner and outer photomultiplier ring in LUCID when the OR trigger is used.
The number of hits in the inner and outer photomultiplier ring in LUCID when the AND trigger is used.

ZDC figures

No figures are available at this time.

Photos and drawings

Photos and drawings of the forward detectors can be found in the web page of the luminosity taskforce.

Plots with collision data

• Public forward detector plots with collision data

Luminosity plots

• Public luminosity plots from 2009 running

• Public luminosity plots from 2010 running

Links

• Forward Detectors main Wiki

• The Luminosity Measurement Taskforce

Responsible

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Responsible: Marco Bruschi

Last reviewed by: The plots have been reviewed by the LUCID collaboration and by the appropriate project leaders

• FL_fig1_tn.jpg:
  

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• FL_fig2.pdf: FL_fig2.pdf

• FL_fig1.pdf: FL_fig1.pdf