JEF meeting, March 22, 2024

Meeting time and location:

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

Agenda

• 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: 100 cables received, 640 cables in total
  • - LV distribution boards [2]. Have to populate with connectors, and design a box around the PCB
• Ongoing projects -- Sasha / Vlad / Hakob / Laveen
  • - Tested and labeled all HV cables ! and about 100 LV cables [3]
  • - Bundling short cables (groups of 7, 7, and 6 cables)
    • finished: LV - 13 layers, HV - 18 layers, signal - 9 layers (40 in total out of 120) [4][5]
• Testing of PMT dividers -- Sasha / Vlad / George
  • - Testing procedure [6]
  • - About 1420 dividers have been fabricated (Chris, Armen, Mindy)
  • - Started removing power regulators on the newly fabricated dividers
  • - George has recently tested 142 dividers (1063 have been tested in total) [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
  • Preparing safety documents. The following ePASes have been submitted and approved -- Sasha and Vlad
    • Installation of the ECAL LMS
    • Installation of cables and dividers,
    • Beam tests with the PS test setup
    • Preparing ECAL cables (EEL126)
    • Fabrication of calorimeter prototypes (EEL126)
    • Testing ECAL dividers (EEL118) (approved in January)
  • Installation of the LMS
    • 1132 fibers have been installed [8]
  • Cable and divider installation [9][10][11]
  • Power installation on the platform has been completed [12]
  • Detector installation page
    • (links from the previous meetings [13][14][15])
  • 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
  • Generated bggen eta->pi0gg events with JEF geometry for background studies [16] -- Stjepan

Minutes

Attendees: Bill, Liping, Stjepan, Vlad, Sasha, Axel, Laveen, Olga, Igal, Jane, S.T.

• Beam test in Hall-D events on 3/15/24, radiation survey of beam line in FCAL showed no activation problem
• Cabling continued in EEL
  • 100 more LV cables arrived, now have 640
  • Laveen worked on bundling and labeling cables
• PMT divider fabrication continues, now have 1420
  • George from detector support group continues testing them, now have 1063 tested dividers
  • Some dividers (~5) needed to be repaired
  • Some dividers produced lower amplitied (~20% level, maybe natural spread?)
• LMS installation was on hold during beam test, but have installed 1132 fibers as of meeting
  • Will resume in April
• Discussed asking for money to build TOF veto counter for inner region not covered by existing TOF scintillators
  • Narrow scintillator bars with wavelength shifting fibers + SiPM readout ?
  • Use discriminators + TDCs instead of flashADCs to cut down cost of electronics
• Discussed idea to measure shower profile in transition region between lead tunstate and lead glass blocks
  • Pair spectrometer setup in hall
  • Have 5x5 ECAL-style modules + many FCAL lead glass blocks
    • Need to consider how to power Cockroft-Walton bases for lead glass modules
• Plan to build 5x5 TAC using COMCAL-style housing + electronics
• Plan to refurbish old fiber-based profiler?
• Summer students: expect 1 from GW, 2 from UNCW
• Stjepan gave an update on studies of backgrounds in the π0γγ channel using bggen
  • Used default analysis library/DReactionFilter cuts but added cut on χ^2/ndf from kinematic fit
  • Igal suggested not to use default cuts but develop own, studying one-by-one with figure-of-merit