JEF meeting, July 12, 2024

Meeting time and location:

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

Agenda

• Preparation of parts for ECAL -- Sasha
  • - HV long cable, 18 ready (out of 36), discussion with the DSG group regarding help
  • - HV distribution boards: has not yet been designed, need 4 boards
  • - LV cables: missing about 20 cables, waiting for the last delivery batch.
  • - LV distribution boards [1]. One board out of 4 is ready, using for testing dividers Media:lv_distribution.jpg
  • - LED: prototype board is ready, have to start testing
• Ongoing projects - All
• Testing of PMT dividers -- Sasha / Vlad / George / Mindy
  • - File:Regulators.xlsx Map of dividers with removed regulators
  • - Testing procedure [2]
  • - All dividers have been fabricated and tested by George [3]
    • Continue removing regulators from the PCB (about 70 regulators have been removed, require re-testing dividers)
• Installation of the FCAL2 detector & integration to GlueX -- Sasha / Vlad / Hakob / Laveen
  • Report from students [4]
  • Installation and testing cables and dividers [5]
  • Installation of signal patch panels [6][7]
  • Installation of long signal cables [8]
  • Connecting signal cables to patch panels [9]
  • Installing LV patch panels and cables [10]
  • Installation of optical fibers [11]
  • Detector installation page
• Summer students -- Sasha
  • - Olivia, Ben, and Shane are on site. Expect one student from Wuhan (have to start with the paperwork)
  • - Projects: document all test results, assist with the cable/divider installation, install signal cables on patch panel, work on the ECAL monitoring plots
• Beam tests with the PS
  • • measure shower beam profile and reconstruction in the crystal/LG transition region
    • (install prototype with 5x5 PbWO4 modules + ? LG)
• Other hardware projects
  • prototype of the ECAL veto counter (?)
• FCAL2 posters for open house** File:1-OH24-Poster-H-Laveen-revised4.pdf
• Abstracts for the DNP meeting [12][13]
• Analysis/Simulation
  • Update on the eta->pi+pi-e+e- channel studies [14] -- Stjepan

Minutes

Attendees: Bill, Sasha, Phil, Stjepan, Laveen, Shane, Ben, Jon, Zisis, Susan, Vlad, Olga, Igal, S.T.

• 4 LV distribution boards have been prepared, need to be populated with connectors
• Some LMS fibers need to be fixed
• Cabling continues -- almost complete on bottom half, start to work on upper half week of 7/15/24
• Vlad suggested we should get scaler readout working soon -- DAQ not ready to go yet
• Stjepan presented MC studies of η→e+e-π+π- signal and background
  • Added E(FCAL) to tree to study E/p for lepton/pion separation -- seems to work reasonably well
  • Look at asymmetry of distribution of angle φ between π+π- and e+e- planes
    • Expect A=0 because no asymmetry is introduced in thrown MC
    • Measured A~0, some small asymmetry appears to be introduced by detector acceptance
  • Largest background from bggen is from π+π-π0 with conversion of one γ or Dalitz decay from π0