JEF meeting, August 25, 2023

Meeting time and location:

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

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
  • Detector installation [12][13][14]
  • Detector installation page
  • Updates from the meetings with Tim's group [15]
  • Discussion of the FCAL2 installation procedures [16]
  • Final mapping of low-voltage cables
  • Mindy continues with wrapping crystals and soldering wires to sockets.
  • Projects for summer students
  • Summer Students (2023)
• 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