JEF meeting, May 31, 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
  • - Update from Laveen
• 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
  • Installation and testing cables and dividers [4] [5]
  • 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
• Analysis/Simulation
  • Challenges in Rare-Decay Measurements (Liping Gan)

Minutes

Attendees: Igal, Phil, Olga, Ben, Shane, Sasha, Liping, Laveen, Stjepan, Jon, Jane, Olivia, Ilya, S.T.

• Sasha's talk at the CALOR2024 conference was well received.
• All cables are in house, hope to get some help from detector support group with these
  • Laveen continues to label and test cables
• Chris S. to start working on HV distribution board design
• Installation of PMT dividers in ECAL continues (now have installed 16 layers)
  • Found and fixed 2 problems
• Drafts for 2 posters (one from Laveen on JEF physics and one from students on hardware) presented and feedback given
• Liping gave a presentation on the issues facing extraction of rare η decays
  • Non-rare decays can lead to large backgrounds for rare decays
  • For η→π0γγ need to suppress both shower overlaps and false shower splits --> use island algorithm
    • Showed examples of usage of island algorithm compared to our implementation
      • Apparent 10% inefficiency at large shower separations needs to be understood