Difference between revisions of "Oct 30,2012 Readout"

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(Tentative Agenda)
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# Update from USM
 
# Update from USM
 
## [[Media:USMReport35.pdf | SiPM Update]] (Javiera)
 
## [[Media:USMReport35.pdf | SiPM Update]] (Javiera)
 +
## [[Media:USMLGReport20121030.pdf | Light Guide Update]] (Alam)
 
# Status of testing at JLab
 
# Status of testing at JLab
 +
#* [https://halldweb.jlab.org/elog-halld/SiPM/ Production testing of mini-Bcal SiPMs] (Ivan)
 
# Status of testing at Regina  
 
# Status of testing at Regina  
 
#* [[Media:SiPM-Breakdown.pdf]] (Shaun)
 
#* [[Media:SiPM-Breakdown.pdf]] (Shaun)
Line 37: Line 39:
  
 
= Minutes =
 
= Minutes =
''Attending:
+
''Attending:Elton, Ivan, David, Beni, Eugene, Yi (JLab); Alam, Javiera, Will, Hayk (USM); Christina, Stratos, Pavlos (Athens); Zisis, Shaun, Andrei (UofR).
 +
 
 +
# Announcements
 +
# Review of Action Items
 +
# Monitoring
 +
## 110 control boards arrived, but incorrect file was used. (CERN sent the order without the attachment. The company made the boards using the file for the prototypes) These will have to be remade.
 +
## Sorting continues for the 3000 LED boards at a good pace
 +
## Setup for measurements of Fcal configuration is almost complete. Measurements of light uniformity and positioning of the Fcal LEDs on the plexiglass should begin next week.
 +
# Update from USM
 +
## [[Media:USMReport35.pdf | SiPM Update]] (Javiera)
 +
##* Status unchanged from last week
 +
##* Last shipment has been paid, but shipping date has not been scheduled.
 +
##* When last shipment arrives and is tested, the few sensors with failures will be exchanged.
 +
## [[Media:USMLGReport20121030.pdf | Light Guide Update]] (Alam)
 +
##* Waiting for Fedex to pick up next shipment of 400 guides.
 +
##* Elton: Shipment of Oct 16 (160 guides) is still stuck in Chile. The Shipment of Oct 19 (400 guides) has arrived in Hampton.
 +
##* Will: Delay in receipt of polishing supplies will in turn delay subsequent shipment by about a week.
 +
# Status of testing at JLab
 +
#* [https://halldweb.jlab.org/elog-halld/SiPM/ Production testing of mini-Bcal SiPMs] (Ivan)
 +
#* Sensors taken from the mini-Bcal were retested after the Hall B beam test for dark rate and PDE at 15 deg and Vover=1.2V.
 +
#* Sensors tested prior to the beam test were tested at 20 degC and Vover=1.1V. Parameters were corrected to the 15 deg and Vover=1.2V for comparison with latest measurements.
 +
#* The dark rate is shown as an average of the 16 cells. The PDE is shown as a fraction.
 +
#* The difference between the measured dark rate per cell (or PDE) between this measurement and the one before the beam test was shown in a table.
 +
#* The DR increased by a factor of 2-3 and the PDE remained essentially unchanged.
 +
#* Eugene: Asked about the expectation between upstream and downstream measurements. Elton: The high energy neutrons probably irradiate the downstream end more than the upstream.
 +
# Status of testing at Regina
 +
#* [[Media:SiPM-Breakdown.pdf]] (Shaun)
 +
#* The ADC value in a 150 ns gate under dark conditions was plotted as a function of voltage. The kink in the plot of ADC vs voltage is taken to be the breakdown voltage. The extracted values agree well with the breakdown voltage determined from the Hamamatsu data (Voperating=Vover +0.9V).
 +
#* Eugene: the signal before breakdown is it consistent with pedestal? Yes.
 +
# Simulations
 +
#* There have been some e-mail exchanges between Andrei and David concerning the thresholds and how they are implemented in the software
 +
#* Sasha came across a discrepancy in the Bcal geometry. It appears that the inner and outer plates are missing from the geometry description. David will make sure these are added correctly into the geometry files.
 +
# Beam Tests, Cosmics
 +
#* Completion of a summary document is getting to the top of the list
 +
# Other
 +
#* Christina has sent Zisis some information for inclusion into the TDR, which will be added.

Latest revision as of 07:10, 1 April 2015

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 and Canada
    • +1-303-248-0285 : International
    • then use participant code: 3421244# (the # is needed when using the phone)
    • OR from www.readytalk.com type access code 3421244 into "join a meeting" without the # (you need java plugin)

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

  1. SiPMs (USM)
    • Provide histograms of all measured units for each specification at T=20 deg C and V=1.2 V above breakdown.
    • Provide feedback on measurements described on the wiki (Elton).

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Monitoring
  4. Update from USM
    1. SiPM Update (Javiera)
    2. Light Guide Update (Alam)
  5. Status of testing at JLab
  6. Status of testing at Regina
  7. Simulations
  8. Beam Tests, Cosmics
  9. Other

Minutes

Attending:Elton, Ivan, David, Beni, Eugene, Yi (JLab); Alam, Javiera, Will, Hayk (USM); Christina, Stratos, Pavlos (Athens); Zisis, Shaun, Andrei (UofR).

  1. Announcements
  2. Review of Action Items
  3. Monitoring
    1. 110 control boards arrived, but incorrect file was used. (CERN sent the order without the attachment. The company made the boards using the file for the prototypes) These will have to be remade.
    2. Sorting continues for the 3000 LED boards at a good pace
    3. Setup for measurements of Fcal configuration is almost complete. Measurements of light uniformity and positioning of the Fcal LEDs on the plexiglass should begin next week.
  4. Update from USM
    1. SiPM Update (Javiera)
      • Status unchanged from last week
      • Last shipment has been paid, but shipping date has not been scheduled.
      • When last shipment arrives and is tested, the few sensors with failures will be exchanged.
    2. Light Guide Update (Alam)
      • Waiting for Fedex to pick up next shipment of 400 guides.
      • Elton: Shipment of Oct 16 (160 guides) is still stuck in Chile. The Shipment of Oct 19 (400 guides) has arrived in Hampton.
      • Will: Delay in receipt of polishing supplies will in turn delay subsequent shipment by about a week.
  5. Status of testing at JLab
    • Production testing of mini-Bcal SiPMs (Ivan)
    • Sensors taken from the mini-Bcal were retested after the Hall B beam test for dark rate and PDE at 15 deg and Vover=1.2V.
    • Sensors tested prior to the beam test were tested at 20 degC and Vover=1.1V. Parameters were corrected to the 15 deg and Vover=1.2V for comparison with latest measurements.
    • The dark rate is shown as an average of the 16 cells. The PDE is shown as a fraction.
    • The difference between the measured dark rate per cell (or PDE) between this measurement and the one before the beam test was shown in a table.
    • The DR increased by a factor of 2-3 and the PDE remained essentially unchanged.
    • Eugene: Asked about the expectation between upstream and downstream measurements. Elton: The high energy neutrons probably irradiate the downstream end more than the upstream.
  6. Status of testing at Regina
    • Media:SiPM-Breakdown.pdf (Shaun)
    • The ADC value in a 150 ns gate under dark conditions was plotted as a function of voltage. The kink in the plot of ADC vs voltage is taken to be the breakdown voltage. The extracted values agree well with the breakdown voltage determined from the Hamamatsu data (Voperating=Vover +0.9V).
    • Eugene: the signal before breakdown is it consistent with pedestal? Yes.
  7. Simulations
    • There have been some e-mail exchanges between Andrei and David concerning the thresholds and how they are implemented in the software
    • Sasha came across a discrepancy in the Bcal geometry. It appears that the inner and outer plates are missing from the geometry description. David will make sure these are added correctly into the geometry files.
  8. Beam Tests, Cosmics
    • Completion of a summary document is getting to the top of the list
  9. Other
    • Christina has sent Zisis some information for inclusion into the TDR, which will be added.