Agenda

Preparation of parts for FCAL2 modules -- Sasha
- Received all 150 CRYTUR crystals from physics division (22-C0275) [1]
  - Expect to receive 95 more CRYTUR crystals in May (835 + 95 = 930 in total)
- Wrapped CRYTUR crystals: 835 (ALL available CRYTUR)
  - Available for wrapping: 60 SICCAS crystals from CCAL && prototype [2] [3]
  - George (DSG group) started disassembling CCAL modules and removing LMS caps.
  - Mindy (DSG group) continues wrapping crystals and soldering wires to sockets
- Disassembling CCAL
  - CCAL moved to the ESB
  - All modules (with SICCAS crystals) are removed
- List of available parts
  - Some PMT housing are missing ( > 60, trying to find with Tim)
Module fabrication -- Sasha
- Fabricated modules: Total 1420 (7 modules fabricated since last week)
  - All SICCAS 576 + 3 SICCAS
  - 834 CRYTUR, available: 1
  - Moving modules to the new lab (EEL108)
Testing of PMT dividers -- Sasha / Arshak
- Most parts for dividers have been received
- 25 dividers for the prototype are ready (have to be tested), expect to receive the LV patch panel prototype

during next week. The CCAL prototype should be ready by the end of next week (?)

Installation of the FCAL2 detector -- Sasha / Arshak
- Detector installation page
- Updates from the meetings with Tim's group
- Manpower and division of tasks
- Projects for summer students
- Meeting with the detector imaging group
Light Monitoring System -- Arshak
- 500mkm Fiber tests
Simulations/Analysis
- draft of slides for collab meeting
Discussion on extension/high intensity running for JEF

Minutes

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

All of the COMCAL modules have been unwrapped and are ready to convert to FCAL-2 modules
PMT housings still missing -- need about 60 (40 + spares)
Shelf space reorganization in the works -- need enough for temporary storage in hall before stacking
Received 25 new dividers from Chris S. + ribbon cables for LV
- Constructed 5x5 module array + LV patch panel, ready for installation in hall
- Cooling plates: checking for water leaks
Arshak continuing studies with 500 micron fibers -- has bundle of 64 fibers, testing in groups of 12-14
- Generally uniformity is good (<20% variation in light intensity ) but had a few outliers
- Need to make decision: plexiglas (cheaper but with potential cross talk issues) and fibers to each module
Lemo connectors have arrived
Grand total fabricated modules remains at 1420
Will have ~10 students helping out in the summer
Simon gave a brief update on 2π0 background studies, will give talk on software/analysis at collaboration meeting
- Need to make FCAL-2 geometry in reconstruction/simulation more realistic
- Island vs default cluster algorithm
Igal working on ML (boosted decision tree in TMVA) to suppress background in η→π0γγ
Discussed running JEF with GlueX-III at higher intensity
- Need to understand increased background (simulate at higher rate)
- Need higher trigger threshold (will not work for η→π0π+π- channel)
- Gain experience with real FCAL-2 next year, then consider JEF extension?