JEF meeting, October 2, 2020

Meeting time and location= 9:00 am EST (JLab time) Bluejeans only

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Agenda

• SICCAS crystals
  1. The QC of the Cystals for the second batch crystals of 174 pcs
• Preparation for module fabrication
• COMCAL tests, TAC running, etc.
• Simulations
  1. Dark scalar search updates

Minutes

Attendees: Sasha,Igal,Josh,Zisis,Jon,Jane,Liping,Susan,Tim B.,Jared,Bill B.

• Jane reported on her visit to Shanghai to inspect 174 new SICCAS crystals
  • Did longitudinal transmission + visual checks
  • generally better quality than previous batch (less scratches and chips)
    • Chamfers still have quality control issues
  • Found 3 obviously discolored crystals (1 purple, 1 yellow, 1 brown) and several mildly discolored crystals
    • Suggested set of a few that we would reject (not have SICCAS send to us), some "maybes"
  • Found some crystals with cloudy regions using laser test
• Josh/Sasha working on inventory and setting up TEDF area for more crystal construction
  • Working on brazing tool (temp control,...), want to automate procedure more
  • Need to get mu-metal shields from Tim W., also waiting for light guides (asked vendor to try to improve polishing quality)
  • Still working on getting access to Carl Zorn's lab for transmittance measurements
  • Josh will continue to work on ESR preshaping
• PMT base developments: week of 10/5, will take bases out of COMCAL setup
  • Chris S. will debug why 2 modified bases did not work
  • Sasha will bring COMCAL to floor of hall for refurbishment
  • Zisis volunteered lab space in Regina for PMT base tests (will need to work on paperwork for this, MOU expired?), also could do some work at UNCW?
    • Zisis has colleague who could give feedback on electronics
• Igal gave an update on his studies regarding the dark scalar boson search using the η→π0γγ channel
  • Major background = 3 π0; Liping suggested that other backgrounds could be significant (mix in existing data?)
  • FCAL-2 did not appear to provide better FOMs than FCAL (insert should provide better energy resolution and lower the frequency of unresolved shower overlaps)
  • Has made steps toward limit calculations