Agenda

Meeting time and location:

Preparation of parts for FCAL2 modules -- Sasha
- Available crystals:
  1450 (modules)
  
  32 (ready for fabrication)
  
  40 (installed on CCAL)
  
  (some CCAL crystals from the inner part will not be used for the FCAL2)
  
  95 expect to receive from CRYTUR in May [1] Expect to start shipping crystals in the 2nd week of April.
  
  Total 1617
- Disassemble the CCAL prototype

- George (DSG group) is unwrapping CCAL modules and removing LMS caps. He'll also work on preshaping ESR reflectors (100 pcs) for CRYTUR.
- Mindy (DSG group) 5 modules wrapped. She continues soldering wires to sockets
- Fix length of LV and HV cables inside the dark box. Chris S. will place an order.
- Got quotes for optical fibers for LMS, will order them today.
Module fabrication -- Sasha
- Fabricated modules: Total 1482
  Currently available for fabrication: 5 (modules will be available during next week)
Testing of PMT dividers -- Sasha / Arshak
- FCAL2 modules with dividers installed on the CCAL [3]
Installation of the FCAL2 detector & integration to GlueX -- Sasha / Arshak
- Detector installation page
- Updates from the meetings with Tim's group [4]

Discussion of the FCAL2 installation procedures [5] [6]

- Manpower and division of tasks
- Projects for summer students
- Summer Students (2023)
Light Monitoring System -- Arshak
Simulations/Analysis

Minutes

Attendees: Bill, Arshak, Igal, Eugene, Sasha, Zisis, Malte, Jane, Jon, Liping, Tim W., S.T.

Crytur confirmed delivery date for 95 remaining crystals, to be sent second week of April
25 COMCAL modules have been unwrapped, caps for LMS removed
- 5 wrapped, ready for assembly
George from detector support group preshaping ESR for Crytur crystals
Length of LV/HV cables has been fixed
Fibers for LMS to be ordered
Number of fabricated modules remains at 1482
Bench test setup for PMT dividers has been restored
Reference PMT for LMS system need to be shielded due to fringe field of solenoid
- Plan to test one new divider to verify gain, then ask for first article of final version
Concerns brought up at installation meeting
- Module compression: number of plates in on each side of insert region?
- Center of gravity of lead glass assembly ~2 cm from downstream end of PWO crystal
- Tim suggested putting brass straps on top/bottom of crystals
- Some discussion of having 2 mm thick plate on top between crystals and LG, would like to avoid
- Shims between PMT housings
- Need to compensate for width of stainless steel straps used for LG, have spares, could be used for this purpose?
Students start arriving in May; Jane will send a student
Igal found ~90% efficiency for CCAL-implementation of island algorithm for 2 photons
- Merging of soft photons not enabled in default algorithm
Discussed possible presentation at Hadron conference