View source for August 20, 2019 DIRC

== Meeting Information ==
GlueX DIRC Meeting<br>
Thursday August 20, 2019<br>
1:00 pm, EDT<br>
Hall D Counting House <br>

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== Agenda ==

# Announcements:
#* Fall 2019 run delayed: expected to start DIRC commissioning November 25
# 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)  [https://logbooks.jlab.org/entry/3709114 Surface voltage test] [https://logbooks.jlab.org/entry/3713852 losing coating] [https://logbooks.jlab.org/entry/3716403 latest update] [https://logbooks.jlab.org/entry/3716606 summary table]
#** "Sandwich" (rear surface) mirror option to protect reflective surface (current priority for testing)
#*** Reflectivity measurements and plans for further samples ([https://halldweb.jlab.org/DocDB/0035/003581/002/DIRC_meeting_20_Aug.pdf 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. [[File:Thetac zoom.png]]
#** [https://halldweb.jlab.org/wiki/images/5/53/Expected_lambda_distribution_082019.pdf 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) [https://logbooks.jlab.org/entry/3716065 Issue] [https://logbooks.jlab.org/entry/3716588 test]
#* Next steps (All)
# [[Spring 2019 DIRC Commissioning|Spring 2019 DIRC Commissioning Analysis]] (All)
#* Commissioning LUT analyses (All)
#** Cherenkov ring fit (Roman) 
#**[https://halldweb.jlab.org/wiki/images/e/e9/Commissioning_AA.pdf Systematics Survey vs Momentum Direction Rotation vs G4 Simulation] (Ahmed) 
#***[http://web-docs.gsi.de/~aali/ahmeddirc/pages/glx_corr_mom.html  Momentum Direction Rotation (Best SPR Method)]
#***[http://web-docs.gsi.de/~aali/v2.mp4 Visualization 1] [http://web-docs.gsi.de/~aali/v3.mp4 Visualization 2]
#**[https://halldweb.jlab.org/wiki/images/7/73/Separation_v1_Ahmed.pdf Pion/Kaon Separation Power 1st version]
#* Commissioning FastDIRC update (Yunjie)
# Software/simulations
#* FastDIRC geometry implementation and alignment work (Cris/Yunjie)
# Software [https://halldweb.jlab.org/wiki/index.php/DIRC_Software_Overview overview] and [https://halldweb.jlab.org/wiki/index.php/DIRC_Software_Tasks tasks] (All)
# AOB