Jun 14, 2018 Calorimeter

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Video Conferencing Information

Meeting Time: 11:00 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 L207 is 757-269-7084 (usual room)
  • JLab Phone: in CC F326 is 757-269-6460
  • 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. Homework from NIM paper. Non-linearity correction of SiPMs (Elton)
  2. BCAL: Create non-linearity corrections for MC for gain adjustment.
  3. BCAL fixes: Hot TDC channel

Complete after new launch

  1. From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal. See Sep 21, 2017 Calorimeter Meeting.

References

  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Collaboration Meeting Spring 2018
  4. Run Updates
    1. FCAL
    2. BCAL
  5. Calibrations
  6. Monitoring
  7. Reconstruction and Simulation
    1. Fine-Grained BCAL in GEANT4 (Colleen)
    2. (Hopefully) some discussion of progress on reaction simulations for Photon/Neutron separation (Tolga)
  8. NIM articles
  9. Any other business

Minutes

Attending: Elton, Colin, Mark (JLab); Zisis, Tegan, Colleen, Ahmed, Dhillon, James (UofR); Sean (FSU); Matt (IU); Tolga (FIU); Will (CMU); George (Athens).

  1. Announcements
  2. Action Items
    • SiPM saturation will be reported on later
  3. Collaboration Meeting Spring 2018
    • Tegan will not be able to give the BCAL report. Zisis volunteered. Tegan will provide latest on gain calibrations. Mark will provide updates on other calibrations, and Elton a summary on hardware issues.
  4. Run Updates
    1. FCAL
      • No new updates. Summary on calibrations, efficiencies, etc., will be given at the collaboration meeting
    2. BCAL
      • Hot TDC channel. See Log Entry 3577352. Will investigate next week, but low threshold may be responsible for increased rate.
  5. Calibrations
    • Calibration Dashboard
    • Colin has updated table based on the latest status. May need to repeat some of the calibrations once the 4ns timing shifts are completed.
    • Colin for Jared: 4ns timing shifts have been completed for most of the 2018 runs. Will report at the collaboration meeting.
    • Sean: Request that everyone take a look at the most recent monitoring launch and verify output, as we are starting serious quality control. Report issues to Sean. Colin: Has looked briefly at the FCAL plots and finds no anomalies.
    • Zisis: Has Marouen completed the PS calibrations? Sean: He has promised but not yet delivered. Elton: Should be encouraged to save calibration code to standard repository.
    • Consideration of SiPM Saturation (Elton)
    • Elton gave a quick overview of the impact of SiPM saturation and what steps will be taken to study and address it.
  6. Monitoring
  7. Reconstruction and Simulation
    1. Fine-Grained BCAL in GEANT4 (Colleen)
      • Using GEANT4 implementation of the fine-grained BCAL MC to study response to cosmic-rays.
      • Compare distributions to Andrei's and Irina's previous work. Preliminary comparisons look reasonable.
      • Next steps are to look at 2018 data and match MC to data.
      • Elton: Is the analysis within the GlueX software? Colleen: No, it is completely separate. Zisis: Plan is to incorporate it into github for general use.
    2. GlueX-doc-3645 Discussion of progress on reaction simulations for Photon/Neutron separation (Tolga)
      • Generating gp->ppi0 and gp->pi+n as a start to study gamma/neutron identification
      • Tolga showed various kinematic distributions, but some are not understood
      • Elton: Suggest you make a scatter plot of p_proton vs p_angle for the gp->ppi0 sample. This might indicate the nature of the two peaks in the distribution. We expect only one at about 60 degrees.
      • Zisis: Look at the multiplicity and time dispersion delta t as a discriminator (studied previously by Andrei). Tolga: This is in the plan.
      • Tolga: FIU has had a local workshop to work through analysis questions, which has been helpful.
  8. NIM articles
  9. Any other business