March 19, 2019 DIRC

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Meeting Information

GlueX DIRC Meeting
Tuesday March 19, 2019
1:00 pm, EDT
JLab F326

Connection Using Bluejeans

  1. To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 846453895.
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  1. Announcements
  2. Summer installation planning:
    • Window for upper box being polished and frame at shop (Ernie)
    • Plans for tests with LED fibers and canullas (Bill/Fernando)
    • Plans for making bar boxes light tight (All)
  3. Spring 2019 DIRC Commissioning (All)
    • REST file processing (ver08) just completed for all commissioning runs with beam 60700-60883:
      • /cache/halld/detectors/DIRC/RunPeriod-2019-01/dirc_monitoring/ver08/REST/
    • Initial pass over REST with plugins in progress to make ROOT TTrees for further analysis: dirc_reactions,dirc_tree,ReactionFilter
      • /volatile/halld/home/gxproj7/RunPeriod-2019-01/dirc_monitoring/analysis_REST/ver08/
    • LUT comparisons (files are located at /group/halld/Users/jrsteven/2018-dirc/):
      • lut_commissioning_2019_v10.root, (default) what's in CCDB with the “nominal” geometry and photons generated over the full end of the bar surface
      • lut_commissioning_2019_v12.root, Yunjie’s “as-built” geometry with photons generated over the full end of the bar surface
      • lut_commissioning_2019_v13.root, Yunjie’s “as-built” geometry with photons generated from the center of the bar end only (ie. DIRCLUTSPREAD=0)
    • LED data analysis and comparison to laser test stand data (Bill/Andrew)
  4. Software/simulations
    • Realistic efficiency/time resolution implemented in DIRCSmearer and merging with random hits added: current branch on GitHub (Justin)
    • Finalizing DIRC "as-built" geometry: JT model from survey/alignment (Yunjie/Stephanie)
    • Adding # photons to LUT likelihood - N pho raw (Maria)
    • FastDIRC geometry implementation and alignment work (Cris/Yunjie)
    • Plans for simulation samples for comparison with data:
      • 25M gen_2pi_amp (ρ), 2.5M gen_2k (φ), (50M?) bggen, LED generator
  5. Software overview and tasks (All)
  6. AOB