Apr 5, 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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  5. More information on connecting to bluejeans is available.

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

Homework from NIM paper

  1. Non-linearity correction of SiPMs (Elton)

Complete after new launch

  1. Report back on study of eta with in FCAL [Mark]
  2. From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal

References

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

Tentative Agenda

  1. Announcements
  2. Action Items
  3. FCAL Update
    1. Run related
    2. Other updates
  4. BCAL update
    1. Run related
      • Hot channel M25 L4 S4 Upstream introduced when FADC module replaced. Fixed with new FADC.
      • Incident on Monday evening (~5:30 pm) BCAL bias voltages did not hold. It appears this was due to poor coordination between Sasha and Counting Room. See Log Entry 3553711.
    2. Other updates
  5. Calibrations
    1. Spring 2018 Calibrations
  6. Monitoring
    1. BCAL LED monitoring update (Ahmed)
  7. Reconstruction and Simulation
    1. Charged Particle Clusterizer (Will)
    2. FCAL Shower and Split-offs
    3. BCAL Hadronic Efficiencies (Elton)
  8. NIM articles
    • BCAL NIM article accepted for publication!
  9. Any other business

Minutes

Attending: Mark, Elton (JLab); Will, Curtis (CMU); Ahmed, Tegan (UofR); Jon (IU); Lei, Rupesh, Tolga (FIU); Sean (FSU)

  1. Announcements
  2. Action Items
  3. FCAL Update
    1. Run related (Note from Colin)
      • Log Entry 3554271 Recent base replacement
      • One thing to bring up at the meeting that I mentioned last meeting was that bases drop HV/fail at a faster rate with beam on target than without. During the 3 wee shutdown, only 3 bases dropped HV. During the week we had beam, 6 bases dropped HV. Note that the LEDs were on the whole time the accelerator was down. We thought it was just coincidental at first, but since the failure rate has increased again I do not think it is coincidental. Some interesting questions:
        • Is this rate dependent? If this was so, we'd see more bases fail at the center of the FCAL than at the edges. Since we don't see this, it does not appear rate dependent. This hasn't been studied in detail, just general observations made.
        • Is it radiation (ie neutrons)? If it is radiation causing this, then we'd expect other components in the base to fail on a regular basis. Since replacing 2 damaged resistors fixes the HV issues, it's unlikely this as we'd expect other components to be damaged. Why don't other electronics on the FCAL platform die regularly? Are there radiation maps fo the hall, or sensors near the FCAL to check/test this?
        • PMTs drawing more current? Maybe the bases/PMTs are drawing more current and causing them to fail when we have beam.
        • Any other ideas? This isn't a major issue, just an observation that doesn't have a clear answer.
    2. Other updates
  4. BCAL update
    1. Run related
      • Hot channel M25 L4 S4 Upstream introduced when FADC module replaced. Fixed with new FADC.
      • Incident on Monday evening (~5:30 pm) BCAL bias voltages did not hold. It appears this was due to poor coordination between Sasha and Counting Room. See Log Entry 3553711.
    2. Other updates
  5. Calibrations
    1. Spring 2018 Calibrations
    2. BCAL (Mark)
  6. Monitoring
    1. BCAL LED monitoring update (Ahmed)
  7. Reconstruction and Simulation
    1. Charged Particle Clusterizer (Will)
    2. FCAL Shower and Split-offs
    3. BCAL Hadronic Efficiencies (Elton)
  8. NIM articles
    • BCAL NIM article accepted for publication!
  9. Any other business