Difference between revisions of "Nov 14, 2019 Calorimeter"

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(Tentative Agenda)
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= Minutes =
 
= Minutes =
''Attending:
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''Attending: Elton, Mark, Jon, Colin (JLab); Will (CMU); Churamani, Tolga (FSU); George, Christina (Athens); Karthik, Zisis, Varun, Ahmed (UofR); Matt (IU);
 +
 
 +
# Announcements
 +
# Action Items
 +
#* Jon: Effect of conversions on particle gun efficiency calculation. Checked one point with particle gun and it seems to account for the discrepancy between particle gun and reaction calculations.
 +
#* Karthik: Has updated documentation on non-linear corrections, which will distribute shortly.
 +
# Run Updates
 +
## FCAL (Colin)
 +
##* Should have sufficient tested bases in hand to swap out next week. Then will take LED data to investigate new firmware and make any HV adjustments.
 +
##* Elton: At the RC meeting, Sasha mentioned has replaced 5 FADC boards in the FCAL. He is concerned that failures may be due to overheating and potentially the feedback system which adjusts the fan speeds. The causal connection for failures is circumstantial.
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## BCAL
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 +
##* Single LED/SiPM test: [https://logbooks.jlab.org/entry/3735113 3735113] and [https://logbooks.jlab.org/entry/3740112 3740112 ]
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# Calibrations
 +
# Monitoring-
 +
#*BCAL-LED update (Varun)[https://halldweb.jlab.org/wiki/images/d/d6/BCAL_LED_Update_%281%29.pdf]
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# Efficiencies
 +
# Simulations
 +
## FCAL energy resolution
 +
### [https://halldweb.jlab.org/wiki/index.php/File:Floor2_sigma.png 2% floor term]
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### [https://halldweb.jlab.org/wiki/index.php/File:Floor3_sigma.png 3% floor term]
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### [https://halldweb.jlab.org/wiki/index.php/File:Floor35_sigma.png 3.5% floor term]
 +
# NIM articles
 +
# Any other business

Revision as of 14:08, 14 November 2019

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. Take a new noise measurements of the BCAL FADC baselines (Mark and Jon)
  2. Evaluate effect of conversions in FCAL efficiency determination with particle gun and reactions (Richard suggestion -> Jon)
  3. Proposal for updating BCAL gain constants 2019 / extrapolation to higher energy (Karthik)
  4. 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
  5. Monitoring-
    • BCAL-LED update (Varun)[2]
  6. Efficiencies
  7. Simulations
    1. FCAL energy resolution
      1. 2% floor term
      2. 3% floor term
      3. 3.5% floor term
  8. NIM articles
  9. Any other business

Minutes

Attending: Elton, Mark, Jon, Colin (JLab); Will (CMU); Churamani, Tolga (FSU); George, Christina (Athens); Karthik, Zisis, Varun, Ahmed (UofR); Matt (IU);

  1. Announcements
  2. Action Items
    • Jon: Effect of conversions on particle gun efficiency calculation. Checked one point with particle gun and it seems to account for the discrepancy between particle gun and reaction calculations.
    • Karthik: Has updated documentation on non-linear corrections, which will distribute shortly.
  3. Run Updates
    1. FCAL (Colin)
      • Should have sufficient tested bases in hand to swap out next week. Then will take LED data to investigate new firmware and make any HV adjustments.
      • Elton: At the RC meeting, Sasha mentioned has replaced 5 FADC boards in the FCAL. He is concerned that failures may be due to overheating and potentially the feedback system which adjusts the fan speeds. The causal connection for failures is circumstantial.
    2. BCAL
  1. Calibrations
  2. Monitoring-
    • BCAL-LED update (Varun)[3]
  3. Efficiencies
  4. Simulations
    1. FCAL energy resolution
      1. 2% floor term
      2. 3% floor term
      3. 3.5% floor term
  5. NIM articles
  6. Any other business