Mar 5,2013 Readout

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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. Shipping discussion
    • Provide actual copy of proforma invoice from Jlab (Elton)
    • Get a count of non-conforming light guides (Elton)
    • Get insurance information for shipment of SiPMs to USM (Will)
    • Give feedback on dimensions and modification options for non-conforming guides (Will)
  2. SiPMs
  3. Simulation

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Status of testing at Regina
  4. Reconstruction
  5. Monitoring
    • e-mail regarding decision on Fcal monitoring LEDs
    • GlueX-doc-2182 FCAL calibration measurements with different colour LED's
  6. Update from JLab
  7. Update from USM
  8. Beam Tests, Cosmics
  9. Other

Minutes

Attending: Elton, David, Beni, Yi (Jlab); Shaun, Zisis, Andrei (UofR); Christina, Pavlos, Stratos (Athens); Hayk, Alam, Elias (USM);

  1. Announcements
  2. Review of Action Items
  3. Status of testing at Regina
    • Tegan continues with PDE tests. He has discovered that the fiber holder is asymmetric giving PDE=15% on one side and 30% on the other. The geometric mean yields approximately the expected value of 22%
    • Elton: Why is the geometric mean used instead of the arithmetic mean? Zisis was unsure and Andrei had not arrived. But testing will continue to investigate this problem.
    • Zisis: Significant revisions made to the fiber NIM paper. In exchanges with the referees, it was noted that the ratio of short/long atten lengths was sensitive to the fit results, so a cut on this value has been used to clean up the analysis.
    • Shaun is working on the cosmic-ray data and will be flying out to NN on Mar 13 to help with data taking.
  4. Reconstruction and simulation
    • David has been able to import the constants that Andrei sent into MCSMEAR.
    • Checked that files give sensible values, but not checked within code.
    • Previously, some of the "constants" were pre-calculated, so he will need to check that all parameters are properly taken from the files at each evaluation.
    • Zisis: Irina continues to submit simulation jobs for neutrons, but they need to be evaluated/compared to photon interactions.
    • Andrei (after he arrived): Mentioned that the reconstruction should take care for shower shapes and he is investigating the best algorithms to do this.
  5. Monitoring
    • Updates on Fcal monitoring to be reported at the Cal Working group meeting next week
    • e-mail regarding decision on Fcal monitoring LEDs
    • GlueX-doc-2182 FCAL calibration measurements with different colour LED's
  6. Update from JLab
    • Gluing procedure at JLab was interrupted 10 days ago due to a suspected bad batch of glue. The consistency of the new batch was less viscous, leading to that suspicion. However, it was discovered that the problem was due to premature curing of partial layers of glue when the UV light was passed very slowly down the column. A uniform and steady illumination down the column seems to "cure" this problem.
    • The mechanical parts are under assembly. This will allow us to install the "cage" onto the end of each module and test the LEDs connected to their respective control boards as they are completed. (Previous modules used the mechanical cages and control board from the mini-Bcal).
    • The assignment of SiPMs to specific readout modules results in that not a single complete set of SiPMs are available on site. Therefore, we need to wait till USM sends us the next shipment to complete the assemblies. At present this is not slowing us down because there are some mechanical pre-assemblies that are needed also. In about a month, this will delay progress.
  7. Update from USM
    • Hayk: Francisco said that the 370 MPPCs in customs should be released this week
    • Estimate to test these sensors when they arrive is about 2 weeks. They only need to be passed though stage 1 and stage 3, as there are already sufficient sensors that have been tested with stage 2.
    • All 4000 light guides have been delivered to JLab. A list of non-conforming light guides from JLab have been sent. USM has produced 1 extra set (40 guides) plus 25 replacement light guides to cover the non-conformances. JLab will send the type of non-conforming guides as they are evaluated.
  8. Beam Tests, Cosmics
  9. Other
    • Zisis: Inquired whether students from USM will be coming to JLab to help during installation. Elton emphasized that this is a good opportunity for students. Hayk said this will be discussed. Regina manpower for the summer is being planned as well.
    • Elton: Serguei is getting visa paperwork together to come to JLab for the summer. Hayk may also visit for about a month.