November 23, 2020 DIRC

From GlueXWiki
Jump to: navigation, search

Meeting Information

GlueX DIRC Meeting
Monday November 23, 2020
1:00 pm, EDT
Remote only

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
  2. South OB mirror box removal and evaluation (Bill, All)
    • After removal found most of less reflective areas are air pockets under glass. Putting pressure on the front glass, can see water move under surface. Conclusion: only one mirror maintained it's water-tight seal, others contain mostly water between surfaces
    • Keith is preparing to remove the mirror from the strong back for the bottom mirror (check if any easier to remove will less tape than original mirrors from MIT)
  3. Followup testing of existing mirror box
    • So far no leakage observed with food dye for submerged mirror (florescent dye ordered)
    • Setting up reflectivity tests for mirrors from South OB for quantitative comparison to reference mirror (Bill)
  4. Mirror prototype test plan following last meeting's discussion (All)
    • Most items for prototypes on order, plan to assemble after Thanksgiving
    • Other thoughts or suggestions?
  5. DIRC commissioning analyses and 2020 studies (All)
  6. Follow-up on additional action items from workfest (All)
    • 100M event MC samples required for ρ and φ data/MC comparisons:
      • /volatile/halld/home/gxproj7/RunPeriod-2019-11/dircsim-2019_11-ver02/analysis/hd_root_gen_2pi_pass00.root
      • /volatile/halld/home/gxproj7/RunPeriod-2019-11/dircsim-2019_11-ver02/analysis/hd_root_gen_2k_pass00.root
  7. AOB