JEF meeting, September 15, 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. Visual inspection: 4 dim crystals, 8 with many chips (consider to send them back to SICCAS) [1][2]

    - Plan to send back about 10 crystals

  • Received 1100 short signal cables [3]
  • Procurement parts for the LMS:

    - Waiting for 7,600 ft of optical fibers. PR department prepared PO but forgot to send it out

• 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] - done
  • 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
  • Report from students
  • Refurbished (remove soldering bumps and rewrap) 42 modules. One more layer of the detector will be installed today.
  • Need to wrap and fabricate about 30 modules using newly received crystals (will replace some already existing modules with low-quality crystals). Plan to finish with this during next week.
• Testing of PMT dividers -- Sasha / Vlad
  • -Tested 6 dividers from the first batch. Asked to produce all remaining dividers. Expect to receive some of them in a couple of weeks
• 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: Sasha, Arshak, Liping, Phil, Zisis, Igal, Jon, Olga, Bill, Jane, S.T.

• Students subdivided new batch of SICCAS crystals into "good, bad, maybe good enough?" categories
  • Selected ~30 good quality SICCAS crystals from last batch to replace low quality NPS crystals
• Fixed some issues (bumps due to soldering, loose tedlar) with fabricated PWO modules
  • Refurbished 42 modules
• Final tests of first-article PMT dividers have been completed, green light given for production
• Have installed 38/40 ECAL layers, some modules needed shims (used green tape)
• Malte found that many installed LG modules had broken PMTs
  • Observed that some divider boxes for LG modules are tilted: maybe squeezing/pushing caused glass to crack?
  • Adding extra inspection during installation, maybe need to realign boxes w.r.t. rest of LG module assembly
• Money to support TOF veto prototype in principle available
  • Also discussed fiber profiler (for measuring shower profile) + using spare crystals to make 5x5 array