Difference between revisions of "Jul 17, 2012 Calorimetry"

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## LED system on Mini BCAL
 
## LED system on Mini BCAL
 
##* [[Media:Mini_BCAL.pdf|‎LED System, 2012 Calorimetry]]
 
##* [[Media:Mini_BCAL.pdf|‎LED System, 2012 Calorimetry]]
 +
##* Tara presented data using the LED monitoring system. Showed a) data of amplitude vs. LED bias voltage b) some data on cross talk c) stability data for a run over the weekend
 +
##* Some data are still not fully digested. There appear to be some pedestal shifts that are not completely understood. Most channels show cross talk of about 1%, but one shows cross talk of up to 10% and needs investigation
 +
##* Christina: Need to systematically understand each individual channel before evaluating the cross talk
 +
##* Beni: Shift of light guides from one side compared to the other could lead to apparent optical cross talk
 +
##* Andrei: Suggests that we disconnect the cables to selected LEDs and check for electronic cross talk. Elton: We can do this once and should plan a program to do this once other tests are completed, because it won't be possible to recable the LEDs.
 +
##* George: A signature of electronic cross talk (and capacitative coupling) might be distorted signals and/or time shifts relative to the LED pulse. Elton: We have looked at the scope for such behavior and find none.
 +
## Athens (Christina)
 +
##* George L. has delivered three SiPMs and electronics to Athens. They will hook them up to the Baby cal and complete similar studies to those done here at JLab.
 +
##* Athens has a single power supply so will need to find a way to power three SiPMs at the same time. The Vop values should be available with the SiPMs. We also have that information in a data base at JLab.
 +
##* Production: LEDS have arrived in Geneva; flexiboard delivery is expected for Aug 6
 
# FCAL
 
# FCAL
 
## Construction Status
 
## Construction Status

Revision as of 16:51, 17 July 2012

Teleconference Time: 11:00 a.m. EST'

  • ESNET (Number is 8542553) and EVO 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 757-269-6337 (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)

  1. Fcal
    • When to ship structure to JLab? (Elton and Tim to review schedule) Should be ready by mid to late August.
  2. SiPMs
    • Show distribution of response uniformity of all SiPMs compared to specifications. See today's presentation

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Monitoring
    1. LED system on Mini BCAL
  4. FCAL
    1. Construction Status
    2. 2011 Hall B FCAL Beam Test (John)
  5. BCAL
    1. Activities at JLab (Module positioning, SiPM binning, LG Travellers)
    2. Cosmics at Regina
    3. Update on BCAL Beam Tests 2012
  6. USM update
    1. SiPM Update (Javiera)
    2. Working Point Analysis (Orlando)
    3. Light guides (Iñaki)
  7. TDR update
    1. Instructions for the TDR (You must be logged into the wiki to access this page).
    2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
    3. Calibration of Calorimeters
  8. Simulations/Reconstruction
  9. Any other business

Minutes

Attendees: David, Beni, Tara, Elton, Yi, John L. (Jlab); Zisis, Andrei (UofR); George, Stratos, Christina (Athens); Javiera, Orlando, Alam, Iñaki (USM); Matt (IU)

  1. Announcements
  2. Review of Action Items
  3. Monitoring
    1. LED system on Mini BCAL
      • ‎LED System, 2012 Calorimetry
      • Tara presented data using the LED monitoring system. Showed a) data of amplitude vs. LED bias voltage b) some data on cross talk c) stability data for a run over the weekend
      • Some data are still not fully digested. There appear to be some pedestal shifts that are not completely understood. Most channels show cross talk of about 1%, but one shows cross talk of up to 10% and needs investigation
      • Christina: Need to systematically understand each individual channel before evaluating the cross talk
      • Beni: Shift of light guides from one side compared to the other could lead to apparent optical cross talk
      • Andrei: Suggests that we disconnect the cables to selected LEDs and check for electronic cross talk. Elton: We can do this once and should plan a program to do this once other tests are completed, because it won't be possible to recable the LEDs.
      • George: A signature of electronic cross talk (and capacitative coupling) might be distorted signals and/or time shifts relative to the LED pulse. Elton: We have looked at the scope for such behavior and find none.
    2. Athens (Christina)
      • George L. has delivered three SiPMs and electronics to Athens. They will hook them up to the Baby cal and complete similar studies to those done here at JLab.
      • Athens has a single power supply so will need to find a way to power three SiPMs at the same time. The Vop values should be available with the SiPMs. We also have that information in a data base at JLab.
      • Production: LEDS have arrived in Geneva; flexiboard delivery is expected for Aug 6
  4. FCAL
    1. Construction Status
    2. 2011 Hall B FCAL Beam Test (John)
  5. BCAL
    1. Activities at JLab (Module positioning, SiPM binning, LG Travellers)
    2. Cosmics at Regina
    3. Update on BCAL Beam Tests 2012
  6. USM update
    1. SiPM Update (Javiera)
    2. Working Point Analysis (Orlando)
    3. Light guides (Iñaki)
  7. TDR update
    1. Instructions for the TDR (You must be logged into the wiki to access this page).
    2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
    3. Calibration of Calorimeters
  8. Simulations/Reconstruction
  9. Any other business
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