JEF meeting, February 5, 2021

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Meeting time and location= 8:30 am EST (JLab time) Bluejeans only


Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Agenda

  • SICCAS crystals
  • COMCAL tests, TAC running, etc.
  • Data analysis
  • Simulations

Minutes

Attendees: Jane,Arshak,Sasha,Igal,Tim B.,Zisis,Jared,Jon,Azizah,Susan,Liping,Phil,Bill B.,S.T.

  • Jane and Sasha have tried contacting our contact at SICCAS with no success
    • Try to get JLab procurement involved?
  • Sasha performing linearity tests of PMT dividers with amplifiers
    • Use pulse shaper to inject charge, record wave forms
    • Shape deformation causing problems
    • Quality problems with amplifier prototypes? Only one working divider
    • Still making plans to send to Zisis -- drop ship?
    • Also could consider Protvino design with booster HV
    • Also could consider reducing number of stages in PMT
  • Refurbishment of COMCAL light monitoring system (LMS)
    • Now using wider-diameter (1mm) fibers -- Josh is polishing ends
    • Plan to compare light yield to older design with smaller diameter fibers
  • NPS collaborator did radiation hardness study of crystals using a medical source
    • 100 kRad -> 3/10 crystals turned brown
    • Expected dose for JEF is much smaller
  • Liping reported that there is some motion at the Chinese Modern Physics Institue toward building a facility like REDTOP
    • 2 GeV proton machine
    • Potential collaborators?
  • S.T. presented an update on implementation of Island algorithm for FCAL-II
    • After correcting for position bias, new algorithm can achieve improved angular resolution relative to other techniques
    • Correction for position bias gets worse the further away the cluster is from the beam line
    • Average number of clusters found for η→π0γγ and 3&pi0; increased as expected compared to default algorithm
      • Still need to guard against too many false splits