Latest revision as of 08:55, 22 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
  • FCAL2 Photon Classification Feature Space -- Azizah
    • True photons and splitoffs present differently in the FCAL and FCAL2.
• Preparation of parts for FCAL2 modules -- Sasha
  • Crystals. [1] Discuss possibility to order 20 more CRYTUR crystals during this F.Y. Have already received 5 more crystals from physics division].
    • currently available/ordered + CCAL: 1593 + (9) (need more spares)
  • Meeting with the DSG group: Mindy and George will continue working on the project in September
  • Preparation of parts[2][3][4]. Remaining components:
    • 300 brass assemblies (Keith and Chris will continue to work on them, waiting for straps)
    • 200 light guides, will be delivered during a couple of next weeks.
    • 400 PMT housings, expect to receive during next two months (bottleneck now)
  • Wrapped CRYTUR crystals: 682
    • All currently available
• Module fabrication -- Sasha
  • Received 72 PMT housings from Tim a couple of days ago; used practically all of them
  • Status of fabrication
  • Fabricated modules: Total 1206 (a new milestone)
    • All SICCAS 576 SICCAS
    • 630 CRYTUR, Remaining: 52
  • Clean room EEL126 [5][6]
    • Expect to move to the new lab EEL108 (the same building) [7]
    • Work on amending safety docs
  • All students will leave during this week (11 students have been working on the project during this summer)
    • Great job !
    • (had also a chance to work on the CCAL project [8])
• Updates from the FCAL installation meetings with Tim's group -- Sasha
  • Meeting in August 10
  • Link to the earlier design meetings
• Light Monitoring System -- Arshak

Minutes

Attendees: Igal, Liping, Arshak, Sasha, Tegan, Zisis, Jon, Jane, Phil, Azizah, Olga, S.T.

• Azizah gave an update on using multi-variate analysis to separate true photons coming from the primary interaction with the target and split-offs due to other interactions
  • Used photons from π0 decay from the reaction ω→π+π-π0
  • Compared response for FCAL-1 and FCAL-2 geometries
    • Followed approach used by Indiana group for FCAL-1
    • Largest differences between FCAL-1 and FCAL-2 seen in sum-V variable
    • For insert region, also saw differences in the timing variable
  • Need to study over/undertraining?
• Zisis mentioned he had a new student working on machine learning using image processing
• Sasha/engineering group/elecronics group periodically meet about installation plan for FCAL-2 (move to more regular meetings?)
  • Stacking coordination, quality checks
  • Refurbishment of FCAL-1 modules
• Will order 20 crystals this fiscal year
• Need to disassemble COMCAL to meet 1600 crystal need
• Module fabrication continues -- previous week was last week for students
  • 1206 completed!
  • Still need various components: brass assemblies, light guides, PMT housing
• Sasha working on contract with GWU for testing PMT dividers
• Arshak continues to work on LMS system to make the light distribution more uniform across the plexiglas plate
  • Switched to LEDS attached to plexiglas -- response flatter but still 3x higher light intensity near edges (was ~60x using fibers)
  • Goal for uniformity: 10-15% difference
  • Try to make final decision regarding approach (FCAL method vs individual fibers to each crystal?) in 3-4 weeks
  • Want to monitor light source itself as well -- reference PMT?
  • Try out diffusion box idea?
  • Divide plexiglas into quadrants?