JEF meeting, August 25, 2023

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Meeting time and location:

Agenda

  • Preparation of parts for ECAL modules -- Sasha
    • Crystals:
      - Received 70 crystals from SICCAS. 66 have been pre-selected by Jane's group
      - Visual inspection: 4 dim crystals, 8 with many chips (consider to send them back to SICCAS) [1][2]
    • Received 1100 short signal cables [3]
    • Procurement parts for the LMS:
      - Waiting for 7,600 ft of optical fibers (August/September)
  • Module fabrication -- Sasha
    • All modules have been fabricated, checked, and inventorized (about 1610 modules in total)
  • Ongoing projects -- Sasha, all
    • Visual inspections of fabricated modules [4] - done
    • All crystals moved to Hall D[5] [6][7].
    • Tested, labeled, and bundled all 100 (+ 2 spares) [8] signal cables connected from the flash ADC to the patch panel [9] - done
    • Test and label 1100 short signal cables - ongoing
    • Tested fabricated modules using LMS [10] - done (need to update the wiki page)
    • Cutting optical fibers and gluing plastic caps [11], waiting for 7600 ft of optical fibers
    • Work on refurbishing LG modules. About 80 modules have small imperfections and have to be fixed (rejected during installation)
      - Mindy is re-wrapping crystals (12 during last week). She also continues soldering wires to the PMT connectors
    • Report from students
  • Testing of PMT dividers -- Sasha / Vlad
    • Received 10 dividers (first article) ! , going to test them during this week (Chris)
  • Proceedures
  • Installation of the FCAL2 detector & integration to GlueX -- Sasha / Arshak / Vlad / Hakob
  • Light monitoring system -- Arshak

Minutes

Attendees: Igor, Igal, Arshak, Jane, Olga, Bill, Zisis, Sasha, Liping, Jon, Malte, Phil, S.T.

  • Found 8 chipped + 4 low quality SICCAS crystals out of set of 70 of the final batch -- likely send them back
  • Short signal cables continue to arrive, expect ~600 more
  • All fabricated modules have been moved to the hall
    • All inspected visually, tested with LMS in dark box
    • Dimensions measured using calipers
    • Sorting in preparation for installation
  • Still expecting last batch of fibers for LMS
  • Minding from detector support group continues to re-wrap modules that have issues
  • Installation of modules in FCAL continues -- now 1196 ECAL+1400 LG
    • Need to be careful -- crystals are very brittle, found 3 cracked lead tungstate crystals + 1 cracked LG block; required partial unstacking and restacking
  • Discussed fiber veto for region near beam line not covered by TOF scintillators
  • Tungsten absorber with holes for optical fibers on the way