Feb 5,2013 Readout

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Revision as of 18:06, 5 February 2013 by Elton (Talk | contribs) (Minutes)

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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
    • Recent photos of 17 scratched SiPMs will be uploaded to the data base.
  2. Simulation
    • David to verify thresholds used in the sampling study and consider practical input/output of data including possible interpolation.

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Collaboration Meeting
  3. Review of Action Items
  4. Status of testing at Regina
  5. Simulations:
    • Decision: nominal or coarse outer layer subdivision for sampling fraction simulations
  6. Monitoring
  7. Update from JLab
    1. Electronics (from Fernando)
      • The remaining activities for the readout tests are under the electronics.
      • 80% of the boards have been tested and are ready for assembly into modules once we receive the mechanical parts; the remaining 20% of the boards are awaiting new resistors (one per SiPM) due to the SiPM grouping.
      • All boards are likely to be ready within the next two weeks.
    2. Status of gluing light guides
  8. Update from USM
    1. Provide analysis and proposal of what to do about the scratched SiPMs
  9. Beam Tests, Cosmics
  10. Other

Minutes

Attending: Elton, David, Yi, Tim, Beni (JLab); Hayk, Orlando, Alam, Serguei, Elias (USM); Zisis, Andrei (UofR)

  1. Announcements
  2. Collaboration Meeting
    • No changes/comments from the previously agreed agenda.
  3. Review of Action Items
  4. Status of testing at Regina
    • Tegan is setting up the SiPM test station and is waiting on some parts.
  5. Simulations:
    • Decision: nominal or coarse outer layer subdivision for sampling fraction simulations
    • We agreed to Zisis' suggestion: Duplicate entries for the outer layers for use now and start work on reconstruction. Further simulations can be done at a later time if analysis shows it is necessary. Andrei can now start work on reconstruction.
  6. Monitoring
  7. Update from JLab
    1. Electronics (from Fernando)
      • The remaining activities for the readout tests are under the electronics.
      • 80% of the boards have been tested and are ready for assembly into modules once we receive the mechanical parts; the remaining 20% of the boards are awaiting new resistors (one per SiPM) due to the SiPM grouping.
      • All boards are likely to be ready within the next two weeks.
    2. Status of gluing light guides
      • GlueX-doc-2131 First look at production modules
      • Substantial discussion followed the presentation trying to make sense out of the data
      • Two questions are raised by the data shown: 1) Why the far/near ratio is similar to that seen in the mini-bcal (ranging from 1-4) 2) Why the "reflection" on the near pulse seems so large (~10% of near pulse)
      • The tentative understanding of these two issues are as follows: 1) A relatively large reflected pulse was riding on the near pulse for the mini-Bcal and artificially enhancing the signal relative to the far channel. With the full module the reflected pulse lost strength and separated from the near peak. Thus the near side was also reduced for the full module and the ratio of near to far remained approximately the same. 2) The "reflected" pulse should be compared to the far side pulse, which is much larger and therefore its strength is actually smaller than it appears in comparison with the near pulse.
      • Special runs should be taken to verify that the second peak riding on the near pulse is actually reflected light.
  8. Update from USM
    1. File:Scratched MPPC Study.pdf (Orlando)
      • File was uploaded, but USM needs additional time to digest the information. The measurement setup is being checked and readied to measure the final batch of MPPCs when they are returned from the US. They deferred their presentation till next week
      • Shipment of 360 returned to Hamamatsu is stuck in customs in Memphis.
    2. Light guides
      • Production rate is four guides per day. That is 10 days (2 weeks) to complete one set. This includes machining, polishing and measuring the guides.
      • Elton: Three non-conforming guides shipped back to Chile are stuck in customs in Santiago.
  9. Beam Tests, Cosmics
  10. Other