Apr 23, 2015 Calorimetry

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Video Conferencing Information

Meeting Time: 11 a.m.

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
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Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Video-conference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

  1. Work with Hovanes to activate VME LED pulser setup for FCAL (Elton). Postpone till mid May, after current run.


  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book
  3. BCAL Action Items and Working Tasks

Tentative Agenda

  1. Announcements
  2. Collaboration Meeting
  3. Action Items
  4. Spring Run
  5. FCAL Update
  6. BCAL Update
  7. Reconstruction and Simulation
  8. Calibration
  9. Any other business


Attendees: Elton, Will, Mark (JLab); Tegan, Ahmed, Zisis (UofR), Adesh, Manuel, Matt (IU); George (Athens)

  1. Announcements
    • Steady beam to Halls A and B.
    • Tuning started to Hall D, but poor quality
  2. Collaboration Meeting
    • talks by Matt, Elton and Will
  3. Action Items
  4. Spring Run
  5. FCAL Update
    1. Calibration
      • Matt met with Adesh and John Zarling to discuss progress
      • Most promising scheme is to use electron calibration to seed pi0 minimization scheme
      • Results in a 12 MeV pi0 width.
      • John will provide latest constants so that Adesh can check them and then enter them into the CCdB
    2. Monitoring
      • Pi0 peaks are already included in the monitoring plots.
      • Would like to add plots with electrons to help understand trigger thresholds
      • Adesh will be working on this and test plugin with files from last fall contrasting FCAL and BCAL triggered files.
    3. JInventory update (Manuel)
      • All information from detector has been added to the JInventory data base
      • Now adding information about loose bases
      • Manuel has written a web interface to query the dB with high level information and provide feedback on the consistency of the data it contains.
    4. Fixes:
      • Elton: Has Paul categorized/summarized failure modes of the repaired bases. Matt: Will get that information from Paul when he returns from vacation. To date he has not identified a primary failure mode.
  6. BCAL Update
    1. Log 3333598
      • Mark has analyzed scans of pedestal data taken by Will and Noemi
      • The mean pedestal of each window (100 samples) is subtracted to remove slow time scale fluctutions
      • General features include: electronic contribution ~1.2 counts; dark hit contribution only at very high over bias; temperature dependence of pedestal
      • Qualitative features understood.
    2. DRAFT of GlueX-doc-2695
      • Reproduces the main features of the pedestal width using nominal values for the gain and rate of SiPM sensors
      • Increase rate by factor=1.4 to agree with data. This increase can partially be accounted for by cross-talk and after pulsing.
      • Data and simulation have slightly different behavior as a function of over voltage.
      • Parameterization was found that roughly fit both the data and simulation. Parameters that best fit the data were also presented.
      • A single simple parameterization for 10 and 18 deg was attempted, but the two data sets have somewhat different systematics.
  7. Reconstruction and Simulation
    1. Inclusion of dark hits into simulation (Tegan)
      • Compiled and fixed errors in new code
      • Current program keeps time history in histograms, but only uses summed energy. Will add pedestal fluctuations to this one.
      • Next step will be to eliminate history created in HDGEANT and do all the pedestal smearing in mcsmear.
      • Mark: Suggested that one should move as quickly as possible to change scheme using the time history histograms. This will simplify and speed up simulation.
    2. DRAFT of GlueX-doc-2694
      • Note summarizes past calculations updated with as-built parameters. Should be useful basis for discussions and new students.
  8. Calibration
    1. time/veff (George)
      • Starting from plugin (original from Will, but modified by Elton) finds showers matched to charged tracks. Compare the z coordinate determined by showers with those from tracking to determined time offsets and veff cell-by-cell.
    2. efficiencies (Ahmed)
      • Completed analysis of bias runs. Results are under review by Zisis and will be posted soon. Programs are ready to be used with new scans this spring.
  9. Any other business