Welcome to the FASER public plots page.

This page is deprecated, please check https://faser-public-plots.app.cern.ch/

The following is a list of FASER plots that have been approved to be shown publicly:

• TDAQ plots
  • FASER trigger rate & ATLAS instantaneous luminosity for August 2022 LHC fills.
  • Caption: The instantaneous luminosity measured at Interaction Point 1 and the FASER total trigger recorded rate are shown for 8 LHC fills between August 19th to 23rd, 2022. The instantaneous luminosity as provided by ATLAS, shown in blue, is given in units of inverse microbarns (10^30 cm-2s-1). The trigger rate is shown in green, given in units of Hz. The trigger rate trend generally follows the luminosity trend but it is evident that the trigger rate falls off more strongly at the beginning of fills that the luminosity. This is due to higher beam losses at the beginning of fills. The dip in trigger rate towards the end of the fill on the 22nd August was due to an issue with the digitizer board which halted data taking for 1 hour and had been the only issue experienced since start of data-taking. Other dips in rate and luminosity are due to emission scans. The time is Central European Summer Time.

• • FASER triggered & recorded rate for August 2022 LHC fills.
  • Caption: The FASER triggered (blue line) and recorded (orange line) are shown for 5 LHC fills between August 20th to 23rd 2022, with 2400 or 2448 colliding bunches. The elevated FASER trigger rates at the beginning of a fill are due to the beams being put into collisions prior to the insertion of the Roman Pots and associated collimators, TCL5 and TCL6, downstream of the FASER location. The dip in trigger rate towards the end of the fill on the 22nd August was due to an issue with the digitizer board which halted data taking for 1 hour. This had been the only issue experienced since start of data-taking. Other dips in rate are due to emission scans. Time is given as Central European Summer Time.

• • FASER triggered & recorded rate for FASER Run 8336 (23/08/2022).
  • Caption: The FASER triggered (blue line) and recorded (orange line) are shown for LHC Fill 8151 on 23rd August 2022.
The LHC fill included 2461 filled and 2448 colliding bunches. A maximum FASER input rate of around 1500 Hz is observed for the start of the run, when the beams are put into collisions and before the Roman Pots and associated collimators, TCL5 and TCL6, downstream of the FASER location, are inserted. Rates drop down to around 1100 Hz after collimator insertion. The dip in rate at around 02h00 and 13h30 is due to an emittance scan at IP1. The LHC levelling at IP1 is evident in the jagged rate steps. Time is given as Central European Summer Time.

• • FASER recorded rate per trigger item for FASER Run 8327 (19/08/2022).
  • Caption: The FASER recorded trigger rates for each of the 4 FASER trigger menu physics trigger items are shown for LHC Fill 8143 on 19th August 2022. The LHC fill contained 2413 filled and 2400 colliding bunches. The dot-dot-dashed blue line represents the calorimeter trigger, the dotted orange line represents a trigger signal in any veto scintillator station or preshower scintillator station, the striped green line represents the timing scintillator station trigger, and the dot-dashed red line represents a coincidence trigger requiring a coincidence between the foremost Veto scintillator station and the preshower scintillator station at the end of the FASER detector. The solid black line is the total recorded rate. No triggers are prescaled. The elevated trigger rates at the beginning of the fill are due to the beams being put into collision and before the Roman Pots and associated collimators, TCL5 and TCL6 downstream of the FASER location, are inserted. The dip in rate at 23h00 is due to an emittance scan at IP1. The calorimeter trigger runs at the lowest rate of around 50 Hz, while the Timing scintillator station trigger runs at the highest rate at around 800 Hz for this particular fill. The total trigger rate is less than the sum of each trigger item due to overlapping triggers. Time is given in Central European Summer Time.

• • FASER total input rate, physics coincidence trigger input rate and deadtime for FASER Run 8336 (23/08/2022).
  • Caption: The FASER total input trigger rate as well as the input rate and incurred deadtime for the physics coincident trigger are shown superimposed for LHC Fill 8151 on 21st August 2022. The LHC fill included 2461 filled and 2448 colliding bunches. The total input rate and physics coincidence trigger input rate are given in units of Hz on the left y-axis, as dot-dashed dark blue and dashed light blue lines, respectively. The deadtime is given in percentage on the right y-axis. The deadtime is defined as the difference between the number of events triggered and the number of events recorded by the coincidence trigger, as the fraction of the number of events triggered by the coincidence trigger.
The physics coincidence trigger selects events with coincident signal in the foremost veto scintillator station and the preshower scintillator station at the back of the detector, likely signifying the passage of an energetic muon from the direction of IP1. The factor 6 smaller rate for the coincidence trigger compared to the total input rate of all triggers, demonstrates that our main triggered background is not muons passing through from IP1 but particles triggering individual trigger stations.

• • Average rate per bunch-crossing ID for FASER 600-bunch Run 8006 (August 2022)
  • Caption: The FASER average trigger rate per bunch-crossing position is shown for LHC Fill 8027. The fill had 603 filled and 590 colliding bunches. The blue bars represent the total recorded trigger rate, and the orange bars represent the recorded trigger rate for the physics coincidence trigger - a coincident trigger between a scintillator at the front and back of the FASER detector, signifying the likely passage of an energetic muon from the direction of IP1. The rate of the physics coincidence trigger is zero for all but filled bunches.

• • FASER Grafana DAQ Overview Dashboard (all green)
  • Caption: The FASER Grafana “DAQ Status Overview” dashboard for monitoring of the data acquisition, including the status of the DAQ receivers, the event builder and the file writer. The dashboard includes information on the current run, such as start time and run type, as well as fields monitoring error counts. Error count fields turn orange, then red, as the number of errors increase.

• • FASER Grafana DAQ Overview Dashboard (all red)
  • Caption: The FASER Grafana “DAQ Status Overview” dashboard for monitoring of the data acquisition, including the status of the DAQ receivers, the event builder and the file writer. The dashboard includes information on the current run, such as start time and run type, as well as fields monitoring error counts. Error count fields turn orange, then red, as the number of errors increase.

• • FASER Grafana DCS Overview Dashboard
  • Caption: The FASER Grafana “DCS Status Overview” dashboard for monitoring of the detector control system’s control values, including the voltage of the scintillator photomultipliers, the bias voltage and current of each tracker station, tracker temperatures and dew point and power output of equipment on and off detector.

• • Alert from FASER-bot in Mattermost.
  • Caption: A snapshot of the FASER bot at work: Via a Grafana web hook, Grafana alerts are posted to a dedicated FASER CERN Mattermost channel. On the 22nd of August 2022, an issue with the digitizer receiver was causing all data to be vetoed due to the digitizer busy signal. The faser-bot alert posts made remote shifters aware of the problem.

• • FASER rate versus TCL5/TCL6 position
  • Caption: These plots show the observed change in the FASER trigger rate, during a dedicated test where the TCL5 and TCL6 collimator settings were changed in July 2022. The TCL collimators are situated on the outgoing beam between the ATLAS collision point and FASER. The x-axis shows the distance of the collimator from the beam, and the y-axis the trigger rate normalised to the rate with the collimators open (TCL6 25mm from the beam, TCL5 14mm from the beam). The plots show there is a strong dependence of the FASER trigger rate on the TCL6 collimator settings, whereas the TCL5 settings do not effect the rate.

• Tracker plots
  • Example plot caption

• Event Displays
  • Example plot caption

Instructions on how to upload a plot

• Use the Attach button on the Twiki page to upload the plot to the page
• Update the Twiki text to include the caption and picture like:

      * Caption: The FASER average trigger rate per bunch-crossing position is shown for LHC Fill 8027. The fill had 603 filled and 590 colliding bunches. The blue bars represent the total recorded trigger rate, and the orange bars represent the recorded trigger rate for the physics coincidence trigger - a coincident trigger between a scintillator at the front and back of the FASER detector, signifying the likely passage of an energetic muon from the direction of IP1. The rate of the physics coincidence trigger is zero for all but filled bunches.
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-- JamieBoyd - 2022-10-08