JEF meeting, October 30, 2020

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

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  • SICCAS crystals
Transmission measurement, batch 1


Attendees: Varun, Jon, Zisis, Sasha, Phil, Liping, Tim B., Jared.

  • Sasha was able to use Carl Zorn's lab to do transmittance measurements of 5 crystals
    • The crystal with the worst transmission profile happens to be the one that is most brown
    • Compare to Shanghai measurements?
    • Question: optical restoration test? Maybe use UV light or bake in an oven? Not tried yet.
  • We received 165 new SICCAS crystals, QA has already started
    • Crystals arrived in boxes of 20 -- maybe too many per box? Concern from Sasha about damage, but first 2 sets of crystals seem fine.
    • First 40 crystals mostly look good -- more or less within spec for dimensions except thicker in the middle relative to the ends by about 30-40 microns
    • Two suspicious crystals in first box.
  • Temperature control for brazing being developed; finalizing setup
  • Problem with 2 dividers that did not work during beam test traced to socket
    • Work is proceeding to finalize design. Plan for Zisis to participate in PMT divider effort.
  • Igal generated millions of simulated events for JEF studies: Mailing list message