JEF meeting, April 19, 2024

Meeting time and location:

• 9:30 am EST (JLab time) remote only
• Connection information

• Preparation of parts for ECAL -- Sasha
  • - signal cables - done
  • - signal patch panel [1] - done
  • - HV short cables: received, checked, labeled (last week)
  • - HV long cable, 18 ready (out of 36)
  • - HV distribution boards: in preparation
  • - LV cables: waiting for about 440 - 150 = 290 cables (will need to test, label, and bundle)
  • - LV distribution boards [2]. Have to populate with connectors, and design a box around the PCB
  • - Chris S. is working on the prototype of the LED board. Currently 5 blue LEDs, consider to add red LEDs as well
• Ongoing projects
  • - Bundling short cables (groups of 7, 7, and 6 cables): signal (done), HV (done), LV (29 layers done, waiting for cables)
  • - Testing, labeling, and bundling LV cables [3] [4] [5]
• Testing of PMT dividers -- Sasha / Vlad / George / Mindy
  • - Testing procedure [6]
  • - Mindy has finished with preparing all sockets (~1650) !
  • - All dividers have been fabricated
  • - Need to remove power regulators on about 200 dividers
  • - George has tested about 1400 dividers [7].
  • - Adding ECAL (and updating FCAL) translation table in the TT.DB (needed for EPICS scalers)
• Installation of the FCAL2 detector & integration to GlueX -- Sasha / Vlad / Hakob / Laveen
  • Submitted ePAS for testing installed dividers
  • Installation of the LMS has been completed [8]
  • Cable and divider installation [9] [10][11]
    • Install cable bundles on vertical chains
    • Sort out dividers, set up jumpers (amplifier/by-pass) and install them.
  • Bundles with optical fibers for the trigger have been installed (Chris, Armen, Mark). Need to install 2 patch panels [12]
  • Receive optical network fibers. Will install them as well as the network switch during next week [13]
  • 7 VXS controllers can be booted now [14]
  • Detector installation page
    • (links from the previous meetings [15][16][17])
  • Other hardware projects
    • --prototype of the ECAL veto counter
    • --study shower profile using PS (also transition region between lead tungstate and LG modules (?) )
• Analysis/Simulation
  • Updates --ig
• FCAL2 poster for open house?
  • JEF/ECAL/FCAL poster
  • exhibit stand (modules, PMTs, etc.)

Minutes

Attendees: Sasha, Bill, Laveen, Zisis, Igal, Liping, Malte, Stjepan, Vlad, Jane, Hakob, S.T.

• Received 3 boxes of LV cables -- still need 290 cables
• LMS installation
  • All fibers connected to ECAL modules
  • Light injection to integrating sphere using LEDs
    • PCB housing LEDs to be glued to flange
    • Currently 5 blue LEDs, thinking about other colors (red?)
    • CAEN 1495 to be used to drive electronics, need to check pulse heights
  • Two reference PMTs
• PMT dividers
  • ePAS in place for installation
  • 180 regulators removed, need to be retested
  • Plan to make light tight and test using oscilloscope after each 1-2 rows installed
• Work continues connecting optical fibers for readout/trigger electronics
• Low level software development continues (TTAB, geometry,...)
• Igal gave update on η→π0γγ studies using spring 2017 data set
  • 4 photons in FCAL, with and without recoil proton
  • Choose combination with best χ^2
  • Sees evidence for η'→ωγ -- can use as reference channel
  • No evidence for signal channel
  • Huge 2π0 + significant 2γ backgrounds