Latest revision as of 23:01, 18 August 2022

Meeting time and location:

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

Agenda

• Simulations/Analysis
  • Updates -- ig
• Preparation of parts for FCAL2 modules -- Sasha
  • Received all crystals from the second CRYTUR order and 5 crystals from the new order by physics division (expect to receive 150 crystals).
  • Meeting with the DSG group [1]. Mindy and George will continue working on the project.
  • Preparation of parts[2][3][4]
    • Perform quality check of the early fabricated crystals, fix orientation of the PMT and re-wrap some crystals
    • Preshaping ESR foils (with the DSG)
    • Wrapping crystals (with the DSG)
    • Preparing Silicon cookies
    • Module fabrication
    • Cleaning brass assemblies
    • Gluing light guides
  • Task for the next week: Perform inventory of all fabricated crystals. Prepare to move to the new lab.
  • Wrapped CRYTUR crystals: 682
    • All currently available (consider to borrow some spares from NPS)
• Module fabrication -- Sasha
  • Received 85 PMT housings from Tim, they have been honed by Bobby. All of them will be used today.
  • Status of fabrication
  • Fabricated modules: Total 1153
    • All SICCAS 577 SICCAS
    • 576 CRYTUR, Remaining: 121
  • Clean room EEL126 [5][6]
    • Expect to move to the new lab EEL108 (the same building) [7]
    • Work on amending safety docs
• Light Monitoring System -- Arshak

Minutes

Attendees: Igal, Sasha, Tegan, Arsak, Phil, Zisis, Liping, Bill, Jon, Jane, Olga, Azizah, Susan, ST.

• Igal gave an update on his cluster separation studies.
  • Showed results from HyCAL analysis showing separation with fairly large efficiency below 2 cm down to 1 cm for the lead tungstate and below 4 cm down to 2 cm for the lead glass blocks using the island algorithm (IA)
    • Liping: normally incident leptons, not photons
    • Position of incident particle determined using beam profiler
    • Two clusters overlayed
    • Lead tungstate results show obvious step behavior; much less sharp for lead glass
    • This step behavior not seen for simulated CCAL 2-cluster (photon) events, and the efficiency drops off faster as a function of d
    • Both analyses used same algorithm, one in Fortran and one in C++ ported directly from the Fortran code
      • Several hard-coded parameters -- need to be tuned?
      • Other potential differences: Geant3 vs Geant4 for shower profile?
  • Looked at xy positions on modified CCAL -- not all features understood
• Fabrication update
  • Received all Crytur crystals from second order + 5 more from pool
  • Ordered 50 more, to arrive March/April
  • All crystals wrapped, some wrapping for earlier modules have been fixed
  • Ran short of strips for brazing, have been ordered
  • PMT housing bottleneck, expect more to arrive this week
  • Some PCB alignments needed to fixed (need to be vertical)
  • Grand total fabricated modules=1153, need to do inventory, prepare shelves for move to new space in EEL (still under construction)
• Arshak working on studying and trying to improve light uniformity over the extent of the plexiglas for the LMS
  • Tried different reflectors on wide face of plexiglas
  • Still more intense near boundaries
  • Try LEDs instead of fibers? Try more fibers?
  • Need to set deadline for going with this approach as opposed to HyCAL method.