JEF meeting, September 4, 2020

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Meeting time and location= 9:30 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.

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  • 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
Beam test results

Minutes

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

  • Zisis introduced a new student, Azizah, who will be working on machine learning
  • Phil mentioned potential student participation through the SULI program next summer (hopefully the covid situation will be better next year..)
  • Sasha continues his studies of new crystals using the PS setup in hall D
    • Latest plots are for CRYTUR crystals, which have slightly lower amplitudes than the SICCAS crystals but generally better resolution.
      • Plan to use 64 CRYTUR crystals in ring around beam hole due to better radiation hardness compared to SICCAS crystals
    • Plan is to send the 2 worst-performing SICCAS crystals back to China and to provide other feedback to Shanghai company
    • Plan to continue taking advantage of the beam time to test as many crystals as possible, but in the future likely test a subset of preselected crystals
    • Question: should we test with light guides? Quality of new light guides appeared to be good, so maybe no?
  • Some motion on SICCAS contract on our end, still expect crystals to be send mid-September, no other updates.
  • Sasha received 3 new PMT dividers from Chris S. (2 with elevated voltages on first dynode, 1 standard divider with resistors chosen to keep current below 1 mA)
    • new bases will be installed hopefully next week
  • Fernando ordered all needed HV; some discussion of regarding connectors and cables to allow >1 kV if needed
  • Have enough pieces on site to construct several modules
    • Some assistance from Tim W.'s group
  • Jared, Igal, and Phil met regarding signal PDF for dark matter search, will meet again next week
  • Sasha is working on FCAL-2/COMCAL slides for PAC jeopardy presentation
  • Liping showed JEF overview and physics slides for PAC jeopardy presentation
    • Plan to combine Sasha's and Liping's slides over next few days