Latest revision as of 08:01, 18 April 2022

Meeting time and location=

• 9:30 am EST (JLab time) remote only
• Zoom meeting ID: 161 050 9142 Passcode: 004965

Agenda

• Preparation for mass production of FCAL2 modules -- Sasha
  • Getting summer students involved in the project. Vaccinated students will be permitted to the lab according to the communication with Brian Hanlon (still to be checked). Not a problem to get 5 - 6 students involved (List of possible tasks).
  • Chris continues brazing brass straps. The quality has been improved. We have many brass assemblies now.
  • DSG:
    • About 700 ESR foils (SICCAS) have been preshaped. Start preshaping foils for CRYTUR crystals (after 900 foils for SICCAS are produced). Need new cutting template.
    • Crystal wrapping is very slow, only about 15 crystals have been wrapped during this week.
  • Production of Silicon cookies at the GWU [1]. See Olga's report. Contract with the GWU is under preparation.
  • Igal: continues wrapping ESR for crystals and Tedlar
  • Procurement of spare PMTs and sockets: no price increase [2]. Submitted PR for 100 PMTs and 200 sockets; not clear when it will be signed.
• Module fabrication -- Sasha
  • Modules fabricated by Arshak and Sasha (list on Google Drive) (grand total 290)
  • Fabricated modules in TEDF
  • Status of fabrication
• Cable distribution of the FCAL insert -- Sasha
  • Connection of LV cables to the PMT base [3][4][5]
  • Draft of the cable distribution in the FCAL dark room (meeting with Fernando and Tim)
  • Submitted PR for procurement of LEMO (signal) connectors (Chris and Fernando)
• Light Monitoring System -- Arshak
  • https://halldweb.jlab.org/DocDB/0055/005557/001/lms_update_04_14_22.pdf
• COMCAL tests, TAC running, etc. -- Sasha
• Data analysis
• Simulations
  • Plots for informal island algorithm discussion -- Simon

Minutes

Attendees: Bill, Zisis, Sasha, Olga, Igal, Liping, Arshak, Tegan, Jon, Susan, Tim B., Tim W., Jane, S.T.

• Situation for students coming to JLab in the summer is becoming clearer
  • Lab is able to pay for lodging and per diem, maybe transportation
  • Phil will send 2 students, GWU has 3 students + 1 from community college, Liping looking at applications from 4 students, 2 students from URegina possible
  • Most pressing task is crystal wrapping; Sasha could also have students work on tagger hodoscope repairs or COMCAL refurbishment
• Since we are using 16 ESR jigs borrowed from NPS, we agreed to produce foils for NPS as their fabrication ramps up
• GWU working on silicon cookies -- currently done by Olga, but soon a student will be doing this
• FCAL2 module count now up to 290
• Discussions with Tim W. and Fernando regarding cabling in the dark room taking place
  • Space for low voltage cables tight but seems manageable
  • Need to pay attention to strain relief and ease of access
  • Made 4x4 array to test cabling
• Arshak continues to work on LMS development
  • Plexiglas delivered from machine shop attenuates injected light to much -- Arsak ordered new cast acrylic plate from outside vendor
  • Some LEDs arrived but integrating sphere is going through procurement process
  • Looking at using connectors for light injection as opposed to gluing fibers directly to plastic sheet
    • 3D printed vs commercial connectors?
  • How to hold in place in front of insert? Discussed angle holders on 4 sides
  • 4-piece plexiglas in front of existing FCAL needs to be modified
• After the meeting we discussed the state of the island algorithm reconstruction and the isolation of the η→π0γγ channel
  • Simon's results don't completely agree with things seen by other people -- not clear tweaking parameters helps in the final analysis
  • TOF veto is important, but backsplash from showers from photons in the FCAL could be a problem