Difference between revisions of "Apr 17, 2012 Readout"

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# SiPMs
 
# SiPMs
 
## <strike> Send information on previous study of after-pulsing (Yi) </strike> See [https://mailman.jlab.org/pipermail/halld-cal/2012-March/000549.html e-mail]
 
## <strike> Send information on previous study of after-pulsing (Yi) </strike> See [https://mailman.jlab.org/pipermail/halld-cal/2012-March/000549.html e-mail]
## Meet in a smaller group to discuss some analytic formulas used to extract quantities of interest. (Serguei)
+
## <strike> Meet in a smaller group to discuss some analytic formulas used to extract quantities of interest. (Serguei) </strike> covered in previous meeting
  
 
=Presentations from recent meetings=
 
=Presentations from recent meetings=
Line 35: Line 35:
 
## [[File:USMUpdate20120417.pdf]] (Javiera)
 
## [[File:USMUpdate20120417.pdf]] (Javiera)
 
# Status of Testing at JLab
 
# Status of Testing at JLab
## [https://halldweb1.jlab.org/elog-halld/SiPM/ Hall-D ELOG]
+
## [https://halldweb.jlab.org/elog-halld/SiPM/ Hall-D ELOG]
 
# Other
 
# Other
  
 
= Minutes =
 
= Minutes =
''Attending:
+
''Attending: Elton, Tim, Fernando, Andrei, Irina, Eugene, Beni (JLab); Orlando, Javiera, Serguei (USM)
 +
 
 +
# Announcements
 +
# Review of Action Items
 +
# [[BCAL Beam Tests 2012]]
 +
## [https://mailman.jlab.org/pipermail/halld-cal/2012-April/000569.html Update to readout board] (Fernando)
 +
##* PCBs on mini-Bcal not optimized.
 +
##* Extra board has been assembled and tested
 +
##* No ringing noticed on the bench
 +
##* Networks optimized to decrease susceptibility to noise on ground and bias lines
 +
##* Pattern of ringing from on board is most pronounced on the left side of the board where there is less grounding due to space constraints on the board
 +
##* presently have 1 oz Cu traces (top) and 0.5 oz traces inner layers. Next version will double the thickness
 +
##* Andrei: Asked if one could shield the input to the pre-amplifiers. Fernando: not too much to gain here
 +
##* Proposal: Install new board on the mini-Bcal to test changes.
 +
##* Discussion whether the TDC output should be reduced from x10 to x5. No strong arguments. Will change to x5, which will implement and test proposed changes that can be made at this time.
 +
##* The new board will be exchanged for the downstream side on Thursday. This will give us a chance to check the thermal connection between the pipe and the cooling plate.
 +
# Update from USM
 +
## [http://atlasusr.fis.utfsm.cl:8000/ USM Web Interface to DB]
 +
## [[File:USMUpdate20120417.pdf]] (Javiera)
 +
##* 200 tested in stage 2, 640 completed in stage 3.
 +
##* Checking data to validate measurements. First shipment will be sent once analysis is verified.
 +
## Orlando
 +
##* Showed updated plots from last week but with 640 sensors
 +
##* Dark rate plotted is ratio of non-pedestal count/pedestal count~0.02/cell. Gate used is 120 ns -> 0.17MHz/cell*16cells=2.7 MHz/ array at 20 deg C.
 +
##* Note that Hamamatsu data gives ~20 MHz / array at 25 deg C.
 +
##* Suggestion for next time is to plot the dark rate under the same conditions as Hamamatsu for ease of comparison.
 +
##* Slide 13 shows the measured number of photoelectrons as a function of position on the box for 3 different temperatures gives consistent results
 +
##*Note that three positions are not working correctly (#16, #28 and #29).
 +
## Elton asked about the total number of failures to date.
 +
##* 2 MPPCs arrived from Hamamatsu with damaged pins, but these have been fixed
 +
##* 1 MPPC found with scratches on the active area
 +
##* 1 MPPC with strange behavior (under investigation).
 +
## Light guide status?
 +
##* Iñaki will send an update
 +
# Status of Testing at JLab
 +
## [https://halldweb.jlab.org/elog-halld/SiPM/ Hall-D ELOG]
 +
# Other

Latest revision as of 10:33, 31 March 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 757-269-6337 (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

  1. Beamtest
    • Draft a run plan (Elton and Zisis)
  2. SiPMs
    1. Send information on previous study of after-pulsing (Yi) See e-mail
    2. Meet in a smaller group to discuss some analytic formulas used to extract quantities of interest. (Serguei) covered in previous meeting

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. BCAL Beam Tests 2012
    • Updates to readout board (Fernando)
  4. Update from USM
    1. USM Web Interface to DB
    2. File:USMUpdate20120417.pdf (Javiera)
  5. Status of Testing at JLab
    1. Hall-D ELOG
  6. Other

Minutes

Attending: Elton, Tim, Fernando, Andrei, Irina, Eugene, Beni (JLab); Orlando, Javiera, Serguei (USM)

  1. Announcements
  2. Review of Action Items
  3. BCAL Beam Tests 2012
    1. Update to readout board (Fernando)
      • PCBs on mini-Bcal not optimized.
      • Extra board has been assembled and tested
      • No ringing noticed on the bench
      • Networks optimized to decrease susceptibility to noise on ground and bias lines
      • Pattern of ringing from on board is most pronounced on the left side of the board where there is less grounding due to space constraints on the board
      • presently have 1 oz Cu traces (top) and 0.5 oz traces inner layers. Next version will double the thickness
      • Andrei: Asked if one could shield the input to the pre-amplifiers. Fernando: not too much to gain here
      • Proposal: Install new board on the mini-Bcal to test changes.
      • Discussion whether the TDC output should be reduced from x10 to x5. No strong arguments. Will change to x5, which will implement and test proposed changes that can be made at this time.
      • The new board will be exchanged for the downstream side on Thursday. This will give us a chance to check the thermal connection between the pipe and the cooling plate.
  4. Update from USM
    1. USM Web Interface to DB
    2. File:USMUpdate20120417.pdf (Javiera)
      • 200 tested in stage 2, 640 completed in stage 3.
      • Checking data to validate measurements. First shipment will be sent once analysis is verified.
    3. Orlando
      • Showed updated plots from last week but with 640 sensors
      • Dark rate plotted is ratio of non-pedestal count/pedestal count~0.02/cell. Gate used is 120 ns -> 0.17MHz/cell*16cells=2.7 MHz/ array at 20 deg C.
      • Note that Hamamatsu data gives ~20 MHz / array at 25 deg C.
      • Suggestion for next time is to plot the dark rate under the same conditions as Hamamatsu for ease of comparison.
      • Slide 13 shows the measured number of photoelectrons as a function of position on the box for 3 different temperatures gives consistent results
      • Note that three positions are not working correctly (#16, #28 and #29).
    4. Elton asked about the total number of failures to date.
      • 2 MPPCs arrived from Hamamatsu with damaged pins, but these have been fixed
      • 1 MPPC found with scratches on the active area
      • 1 MPPC with strange behavior (under investigation).
    5. Light guide status?
      • Iñaki will send an update
  5. Status of Testing at JLab
    1. Hall-D ELOG
  6. Other