JEF meeting, January 24, 2020

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Meeting time and location= 10:00 am EST (JLab time) F226

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Attendees: Varun, Jon Z., Tim W., Tim B., Arshak, Igal, Zisis, Josh, Sasha, Liping, Jane, Phil C., S.T.

  • Module fabrication area in TEDF has been cleaned out, tables are available, Walt A. has order shelves -- space is almost ready to go (some stuff will be moved out on Monday 1/27/20).
  • SICCAS update: 160 crystals packed and ready to be shipped to us in 4 boxes
    • 60 intended for NPS
    • Visual inspection and initial QA by Jane lead to rejection of 16% of crystals the company produced
      • Some of the 160 crystals we accepted warrant further study
      • NPS found discrepancies between their transmission measurements and the company's, we will test several to check
      • Need to provide feedback to company after crystals arrive (in 2 weeks?)
  • Light yield setups: NPS setup is fully operational -- we are in the process of making a duplicate setup in EEL126, almost ready to go pending computer connections.
  • We went over Sasha's spreadsheet for module procurement
    • Some work on inner surface of mu-metal shields needs to be done by the company that does the welding
    • Plan to buy ESR (reflective material) and possibly mu-metal for entire 1600 crystal set.
      • Some indication that putting ESR on end opposite to PMT leeds to ~5% larger yield -- reduce hole size?
    • Light guide diameter still not entirely pinned down -- 18 mm is standard size but we gain some light collection benefit going to 18.8 mm, which would require machining. Question: is the extra $ expense worth it?
    • Tim B. has machine shop at UNCW that could be used for many possible tasks -- we are in the process of trying to find tasks that would be appropriate for him/his students to do. Brass flanges? PMT testing?
    • Need to find another source for brass straps (company we used before no longer carries exactly what we used).
      • Still planning destructive stress test.