Jul 25, 2019 Calorimeter

From GlueXWiki
Jump to: navigation, search

Meeting Time: 11:00 a.m.

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  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

References

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

Goals for Calorimetry Group

  1. Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
  2. Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at east 5 MeV.
  3. Demonstrate agreement of photon reconstruction efficiency and resolution between data and simulation as a function of E, phi and theta to within 5%.

Action Items

Short term items:

  1. Suggest better timing variables to use in reconstruction of neutrons (Sean to Tolga) Sean suggested that for the particle gun studies he use the thrown and reconstructed quantities directly and avoid the RF time.
  2. Complete Calorimeter work packages

Long term items:

  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.
  2. FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See Log Entry 3595928 and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause:
    1. 50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
    2. 50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
    3. 50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Run Updates
    1. FCAL
    2. BCAL
  4. Calibrations
    1. Log Entry 3703102 Update on SiPM Saturation (Elton)
    2. Log Entry 3709680 BCAL Waveforms (Elton)
  5. Monitoring
  6. Efficiencies
    1. Mark, Sean and I had a video conference with Beijiang and students this morning. A new student, Ma Runqiu, will continue the Costhe efficiency studies for the FCAL for 2017 and 2018. Mark has already generated omega events for spring 2018 and will submit requests for 2017.
    2. FCAL efficiency report (omega and gun studies): Jon [2]
  7. Simulations
  8. BCAL Deep Learning
  9. NIM articles
  10. Any other business

Minutes

Attending: Elton, Mark, Collin (JLab); Will (CMU); Jon (IU); Ahmed, Karthik, Dhillon (UofR); Sean (FSU); Tolga (FIU).

  1. Announcements
  2. Action Items
    • Reviewed calorimeter packages and updated table. Karthik will update item 3 with links to a report. Orphan tasks have been identified with a question mark.
  3. Run Updates
    1. FCAL
    2. BCAL
  4. Calibrations
    1. Log Entry 3703102 Update on SiPM Saturation (Elton)
    2. Log Entry 3709680 BCAL Waveforms (Elton)
  5. Monitoring
    • (Colin) Reporting for summer REU student working on analysis of radiation damage in FCAL.
    • Looking at LED signals of various colors in different rings in FCAL in the spring 2018 data
    • Find 15-20% degradation for violet between the beginning and end of the spring run. Damage is likely at the upstream end of the block and may not affect shower energies very much.
    • Behavior is quite smooth with a few jumps at HV adjustments.
    • Plan to check location of pi0 peak vs time and see if there has been any effect on shower energies.
  6. Efficiencies
    1. Mark, Sean and I had a video conference with Beijiang and students this morning. A new student, Ma Runqiu, will continue the Costhe efficiency studies for the FCAL for 2017 and 2018. Mark has already generated omega events for spring 2018 and will submit requests for 2017.
    2. FCAL efficiency report (omega and gun studies): Jon [3]
      • Jon updated the group on the GlueX report that was posted sometime back.
      • Calculated efficiencies are reported for studies with particle gun (MC) and omega->3pi reaction (MC and data)
      • He finds reasonable agreement between data and MC, but calculated efficiencies with omega are higher than with particle gun, which is a non-intuitive result. This result seems to be reproduced in analysis with charged pions.
      • Mark: Suggests that Jon look at the number of combos. Filling histograms with multiple combos may overestimate the efficiency.
      • See Peter Pauli's note on uniqueness tracking in Gluex-doc-3993
  7. Simulations
  8. BCAL Deep Learning
  9. NIM articles
  10. Any other business
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=Jul_25,_2019_Calorimeter&oldid=93351"