JEF meeting, August 19, 2022

From GlueXWiki
Jump to: navigation, search

Meeting time and location:

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

Agenda

  • Simulations/Analysis
  • 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)
    • 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
  • 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?
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=JEF_meeting,_August_19,_2022&oldid=115376"