August 20, 2019 DIRC

Meeting Information

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

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Agenda

1. Announcements:
   • Fall 2019 run delayed: expected to start DIRC commissioning November 25
2. Installation work:
   • South OB Mirror replacement update
     • Mirror removal and strongback anodizing (Bill, Mark, All)
     • 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
       • Reflectivity measurements and plans (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 mrad for nominal and 8.06 mead for 1mm glass sandwich.

1. • Bar box gas fitting issue resolved (Mark and Tim)
   • Installation of cables/fibers/distribution boxes (Bill)
   • Tape (mirror-strongback) in water study (Bill, All) Issue test
   • Next steps (All)
2. Spring 2019 DIRC Commissioning Analysis (All)
   • Commissioning LUT analyses (All)
     • Cherenkov ring fit (Roman)
     • Systematics [Survey vs Momentum Direction Rotation vs G4 Simulation ] (Ahmed)
       • Momentum Direction Rotation (Best SPR Method)
       • Visualization 1 Visualization 2
   • Commissioning FastDIRC update (Yunjie)
3. Software/simulations
   • FastDIRC geometry implementation and alignment work (Cris/Yunjie)
4. Software overview and tasks (All)
5. AOB