Difference between revisions of "Apr 24, 2014 Calorimetry"

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#* John will give an update on the Fcal and Elton will give an update on the Bcal.
 
#* John will give an update on the Fcal and Elton will give an update on the Bcal.
 
# Action Items
 
# Action Items
−
# FCAL
+
# Monitoring (Athens)
 +
#* Christina reported that George Vasileiadis visited the university during his Easter break. He is likely to be stationed in Athens for some time and can stay in touch during that time.
 +
# FCAL [https://logbooks.jlab.org/book/hdfcal HDFCAL log book]
 +
## FADC problems
 +
##* Working with Hai and Brian
 +
##* Multiple problems encountered with Flashes. Five Fadcs replaced. Only one actually had a hardware problem.
 +
##* New firmware update fixed all problems on the north side (likely on south also, but not checked yet)
 +
##* Plots show that all signals from the LED pulsing system are within about 20 ns of each other in the Fadc. Delays are systematic across the face of the Fcal due to propagation of LED light through the acrylic
 +
## Next steps
 +
##* Recheck all channels, including south side
 +
##* Gain balancing is next. Plan to use LED light to smooth out response between neighbors. Response currently varies by factors of 2-3.
 +
##* Possibly use cosmics to check response to muons
 +
##* The goal is to minimize the differences in response so that calibrations using beam pi0s will converge.
 +
##* Use TOF counters to trigger events and see if this can help gain matching
 +
## Response to muons
 +
##* Test at IU to determine the response of calorimeter to cosmic muons has been setup
 +
##* Hardware is in place, but DAQ is not ready
 +
##* Student working on project will be at JLab this summer
 
#* [https://logbooks.jlab.org/book/hdbcal HDFCAL log book]
 
#* [https://logbooks.jlab.org/book/hdbcal HDFCAL log book]
 
# BCAL
 
# BCAL

Revision as of 13:29, 24 April 2014

Teleconference Time: 11:00 a.m. EST

  • ESNET (Number is 8542553) and SeeVogh session (GlueX Calorimetry meeting room)
  • Phone connection only upon request.
    • +1-866-740-1260 : US+Canada
    • +1-303-248-0285 : International
    • then enter participant code: 3421244# (remember the "#").
    • or www.readytalk.com (and code without the #)

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 Videoconference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Items for followup from previous meeting(s)

  • BCAL: Check max ratings for MPPCs (Elton).

Tentative Agenda

  1. Announcements
  2. Collaboration Meeting May 12-14
  3. Action Items
  4. FCAL
  5. BCAL
  6. Reconstruction and Simulation
  7. TDR update
  8. Calibration
  9. Any other business

Minutes

Attendees: Elton, John, Yi, Andrei, Will, David (JLab); Shaun (UofR); Christina, George, Pavols (Athens).

  1. Announcements
  2. Collaboration Meeting May 12-14
    • John will give an update on the Fcal and Elton will give an update on the Bcal.
  3. Action Items
  4. Monitoring (Athens)
    • Christina reported that George Vasileiadis visited the university during his Easter break. He is likely to be stationed in Athens for some time and can stay in touch during that time.
  5. FCAL HDFCAL log book
    1. FADC problems
      • Working with Hai and Brian
      • Multiple problems encountered with Flashes. Five Fadcs replaced. Only one actually had a hardware problem.
      • New firmware update fixed all problems on the north side (likely on south also, but not checked yet)
      • Plots show that all signals from the LED pulsing system are within about 20 ns of each other in the Fadc. Delays are systematic across the face of the Fcal due to propagation of LED light through the acrylic
    2. Next steps
      • Recheck all channels, including south side
      • Gain balancing is next. Plan to use LED light to smooth out response between neighbors. Response currently varies by factors of 2-3.
      • Possibly use cosmics to check response to muons
      • The goal is to minimize the differences in response so that calibrations using beam pi0s will converge.
      • Use TOF counters to trigger events and see if this can help gain matching
    3. Response to muons
      • Test at IU to determine the response of calorimeter to cosmic muons has been setup
      • Hardware is in place, but DAQ is not ready
      • Student working on project will be at JLab this summer
  6. BCAL
  7. Reconstruction and Simulation
  8. TDR update
  9. Calibration
  10. Any other business
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