August 20, 2019 DIRC

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Meeting Information

GlueX DIRC Meeting
Thursday August 20, 2019
1:00 pm, EDT
Hall D Counting House

Connection Using Bluejeans

  1. To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 846453895.
  2. To join via a Web Browser, go to the page [1] .
  3. To join via phone, use one of the following numbers and the Conference ID: 846453895
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. More information on connecting to bluejeans is available.


  1. Announcements:
    • Fall 2019 run delayed: expected to start DIRC commissioning November 25
  2. Installation work:
    • South OB Mirror replacement update
      • All mirrors removed from strongback, preparing for anodizing (Bill, Mark, All)
        • Possibility to modify one strongback piece for to allow for LED diffuser (Bill, Stephanie)
      • Mirror studies and water tests (Bill, All) Surface voltage test losing coating latest update summary table
      • "Sandwich" (rear surface) mirror option to protect reflective surface (current priority for testing)
        • Reflectivity measurements and plans for further samples (Bill, All)
        • Simulation of nominal first surface mirror (black) and sandwich mirror with 1mm glass on top of reflective surface (blue). Single photon resolution not degraded by adding thin glass on top of reflective surface: 8.16 +/- 0.01 mrad for nominal and 8.06 +/- 0.01 mead for 1mm glass sandwich. Thetac zoom.png
      • More on expected wavelength distribution (Yunjie)
      • Deadline for decision on mirror replacement is September 5. Complete schedule from Tim after this date for installation before Fall run.
    • North box installation progress (Tim, All)
      • Planning for extraction of mirror box in situ, for mirror replacement
    • Tape (mirror-strongback) in water study (Bill, All) Issue test
    • Next steps (All)
  3. Spring 2019 DIRC Commissioning Analysis (All)
  4. Software/simulations
    • FastDIRC geometry implementation and alignment work (Cris/Yunjie)
  5. Software overview and tasks (All)
  6. AOB