JEF meeting, November 22, 2019

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


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Agenda

  • CRYTUR crystals
  • SICCAS crystals
  • Preparations for upcoming run

Minutes

Attendees: Arshak, Vlad B., Liping, Josh C., Jane, S.T., Sasha, Zisis

  • Wuhan contract: Eugene got response from contract department, no problems seen, will proceed with info provided by Jane.
  • CRYTUR crystals are in Vlad's lab, look good.
  • SICCAS crystals are more or less on schedule -- expect some in December? Company will tell Jane when they are ready for visual inspection.
    • Mentioned some unspecified "difficulty", doesn't seem to be a showstopper.
  • Buy more (~30) CRYTUR crystals for region closest to beam line? (price differential $1.8k vs $1k (SICCAS) needs to be considered).
  • Rolf still on board with buying SICCAS crystals up to a total of 1600 (500 already on order).
    • Keep adding to existing order? Feedback needed first?
  • PMTs: received 50 first article tubes out of 500, but have wrong socket type!
    • Will accept, can adapt with some machining of parts
    • Need to sort according to diameter (2 are too big, need to reject; 8 more tight fit into shielding)
      • Considering cooperating with NPS to get smaller diameter tubes will giving them the ones that are too big.
      • Test collar planned
    • Plan to test ~20% of the tubes
    • Nex 50 PMTs should arrive soon, should have right sockets.
  • Plan to duplicate Vlad's light yield setup
    • Set up in EEL 126?
    • Dark box components on order
    • Some parts need to be 3D printed
    • Trigger scintillator needs to be tested
    • Electronics stand needed (VXS crate, PC, HV, etc.) -- goal = January?
      • Fernando has ordered crates.
  • Clean room for module assembly -- space identified in TEDF, space cleaned out in December
  • Light transmission setup: Carl Zorn's lab in ARC upgrading from Windows 7 to Windows 10.
  • Finalization of module design
    • Light guides are chopped and polished, ready to go.
    • Will use DIRC cookie idea, ready for testing.
    • Ready for force analysis -- can use "banged-up" crystals for this purpose
      • Need to address question of whether 25 micron thick straps are good enough
      • No corrosion seen with latest brazing compound/technique
      • Need 4 new brazing heads, need temp controls.
      • Keep several assembled modules on shelf for some time to check stability over time.
    • Soft iron for magnetic shield has been annealed.
    • ESR (reflective material) thickness is currently 65 microns, looking into finding thinner material.
    • Goal for "final" design by mid January.
  • Test setup on PS arm
    • Platform ready Dec 4?
    • Still need plate for 12 module assembly
    • Use some junk crystals to test assembly?
  • Base redesign (Vlad P.)
    • 3 new bases installed in COMCAL
      • 2 with amplification change, 1 with low pass filter added
      • Measure linearity
      • Final desing by summer 2020?
  • Discussed idea to replace bases for LG in FCAL.
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