JEF meeting, April 26, 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 160 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 (36 layers done, waiting for cables) [3]
  • - Update from Laveen
• Testing of PMT dividers -- Sasha / Vlad / George / Mindy
  • - Testing procedure [4]
  • - 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 [5].
  • - 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 [6]
  • Cable and divider installation [7]
    • Install cable bundles on vertical chains
    • Sort out dividers, set up jumpers (amplifier/by-pass) a]nd install them.
  • Two optical patch panels for the trigger distribution installed (Armen and Mark) [8] [9]
  • Ethernet switch installed [10]
  • Connecting crates to the switch
  • Preparing for testing installed dividers
  • Detector installation page
    • (links from the previous meetings [11][12][13])
  • Other hardware projects
    • --prototype of the ECAL veto counter
    • --study shower profile using PS (also transition region between lead tungstate and LG modules (?) )
• FCAL2 poster for open house?
  • JEF/ECAL/FCAL poster
  • exhibit stand (modules, PMTs, etc.)
• Analysis/Simulation
  • Update on pi0gg bggen studies [14] -- Stjepan

Minutes

Attendees: Bill, Laveen, Igal, Vlad, Sasha, Jon, Stjepan, Phil, Liping, Jane, S.T.

• Still waiting for final batch of LV cables
• Chris S. working on LED driver board
• PMT divider testing continues, fewer than 100 need to be tested (due to regulator fix)
• Laveen reported on his cable bundling+labeling and translation table work
• 36 PMT dividers installed, working on making dark room light tight to test in situ
• Optical fiber + ethernet switch installation for trigger electronics continues
• Some discussion regarding physics trigger: will use new VTP boards for ECAL
  • ECAL to be treated like other detectors: inclusion in energy sum
    • Need to equalize gains using HV, because no individual gains in flashADC input to trigger
  • LED using CAEN1495 pulser as separate trigger input on face of trigger supervisor
• Igal identified sources of 2γ background in η→π0γγ
• Stjepan gave update on bggen background studies for η→π0γγ
• Plan to generate large sample of simulated events on OSG