JEF meeting, May 20, 2022

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meeting time and location

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



Attendees: Bill, Zisis, Sasha, Arshak, Igal, Tegan, Susan, Jon, Tim B., Phil, Jane, Olga, Axel, S.T.

  • 3 students from GWU/NOVA on site
    • Checking quality of replacement SICCAS crystals from NPS
      • Lookin for color, bubbles, cracks, chips
      • Checking dimensions: found 1 outlier (300 microns smaller than nominal)
    • Wrapping crystals (32 as of meeting time)
    • Cutting ESR
  • Expect 3 students from UNCW June 1 and 3 students from Lamar mid-June
    • All students need to take special undergraduate training
  • Detector support group still working on wrapping and ESR preshaping
  • Grand total of fabricated modules = 433
  • Arshak gave a preview of his talk for collaboration meeting next week on LMS
    • Highlighted plot of light intensity as a function of position along plexiglas: high intensity near edges
  • PMT divider effort: waiting for procurement of components; still plan for fabrication in summer
  • Igal gave an update on η→π0γγ analysis for simulated FCAL-2 events
    • Backgrounds from 3π0 and γγ channels
    • Default cluster algorithm + cuts: no obvious signal seen
      • Also no difference between 2 algorithms and center-of-gravity vs log-weighted positions
      • Looked at thrown distances between clusters
    • Starts to see more obvious signal peak when he applies a cut on the separation between the π0 and the bacheler γs from the signal channel
      • no TOF veto applied
    • Separation between close clusters < 15 cm with island algorithm does not agree with thrown separation
  • ECT* proposal has been submitted