JEF meeting, February 3, 2023

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Meeting time and location:

  • 9:30 am EST (JLab time) remote only
  • Zoom meeting ID: 161 050 9142 Passcode: 004965

Agenda

during next week. The CCAL prototype should be ready by the end of next week (?)

Minutes

Attendees: Igal, Zisis, Sasha, Igor, Arshak, Phil, Olga, Liping, Azizah, Jon, Malte, Mark D., Jane, Axel, S.T.

  • George from detector support group disassembling COMCAL modules: 10 unwrapped, removed caps for fiber insertion
  • ~60 SICCAS crystals ready for rewrapping
  • Some PMT housings still missing -- may need to reorder
  • 1420 FCAL-2 modules have been assembled to date
  • 5x5 prototype of patch panel for LV distribution has been fabricated
    • Install in Hall for testing with beam
    • Plan for full scale design is for 4 long patch panels on each side of beam pipe
    • LV/HV/signal cables will be separated into different patch panels
    • LV will be supplied by unshielded ribbon cables w/ 8 lines, only using 3 -- consider shielded alternative?
  • List of summer students (~10 so far) coming together
  • Discussed graduate student and postdoc involvement (after construction: data anlysis, calibration, etc.)
  • Malte will give a talk at the collaboration meeting on current FCAL plans and preparations for lead glass
  • Sasha will give the FCAL-2 talk, including a couple of slides on the LMS
    • Plexiglas is a viable solution, but with a small amount of cross talk
    • Fiber option: no cross talk, but need to confirm light uniformity is good enough
  • LMS update: Arshak completed tests using individual 500 micron diameter fibers
    • Made 64 fiber bundle, one end at integrating sphere, the other individual separated holes in test setup
    • Uniformity at ~15-20% level, better than 250 micron fibers, with more light
    • Need to put fibers into donuts to attach to crystals
    • Need to make large bundle with sufficient spares (total number of fibers 1650-1700? Need 1596.)
    • Do we need multiple LED wavelengths? Useful for monitoring radiation damage.
    • Add time-stable reference? Americium source. Also for FCAL. Malte suggested adding a fiber to each of the 4 existing plexiglas plates for use later.
  • LMS will add material in front of the insert and would make putting foam support upstream of the insert in the recess difficult
    • Simulate impact of material on cluster positions
  • Existing FCAL plexiglas needs to be modified for the new hole.
    • Inspect after removal, may need to replace
  • Expect electronics for LMS to be same as for DIRC/COMCAL