JEF meeting, August 12, 2022
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Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Zoom meeting ID: 161 050 9142 Passcode: 004965
Agenda
- Simulations/Analysis
- Updates -- ig
- Preparation of parts for FCAL2 modules -- Sasha
- Received all crystals from the second CRYTUR order and 5 crystals from the new order by physics division (expect to receive 150 crystals).
- Meeting with the DSG group [1]. Mindy and George will continue working on the project.
- Preparation of parts[2][3][4]
- Perform quality check of the early fabricated crystals, fix orientation of the PMT and re-wrap some crystals
- Preshaping ESR foils (with the DSG)
- Wrapping crystals (with the DSG)
- Preparing Silicon cookies
- Module fabrication
- Cleaning brass assemblies
- Gluing light guides
- Task for the next week: Perform inventory of all fabricated crystals. Prepare to move to the new lab.
- Wrapped CRYTUR crystals: 682
- All currently available (consider to borrow some spares from NPS)
- Module fabrication -- Sasha
- Received 85 PMT housings from Tim, they have been honed by Bobby. All of them will be used today.
- Status of fabrication
- Fabricated modules: Total 1153
- All SICCAS 577 SICCAS
- 576 CRYTUR, Remaining: 121
- Clean room EEL126 [5][6]
- Expect to move to the new lab EEL108 (the same building) [7]
- Work on amending safety docs
- Updates from the FCAL installation meetings with Tim's group -- Sasha
- Light Monitoring System -- Arshak
Minutes
Attendees: Igal, Sasha, Tegan, Arsak, Phil, Zisis, Liping, Bill, Jon, Jane, Olga, Azizah, Susan, ST.
- Igal gave an update on his cluster separation studies.
- Showed results from HyCAL analysis showing separation with fairly large efficiency below 2 cm down to 1 cm for the lead tungstate and below 4 cm down to 2 cm for the lead glass blocks using the island algorithm (IA)
- Liping: normally incident leptons, not photons
- Position of incident particle determined using beam profiler
- Two clusters overlayed
- Lead tungstate results show obvious step behavior; much less sharp for lead glass
- This step behavior not seen for simulated CCAL 2-cluster (photon) events, and the efficiency drops off faster as a function of d
- Both analyses used same algorithm, one in Fortran and one in C++ ported directly from the Fortran code
- Several hard-coded parameters -- need to be tuned?
- Other potential differences: Geant3 vs Geant4 for shower profile?
- Looked at xy positions on modified CCAL -- not all features understood
- Showed results from HyCAL analysis showing separation with fairly large efficiency below 2 cm down to 1 cm for the lead tungstate and below 4 cm down to 2 cm for the lead glass blocks using the island algorithm (IA)
- Fabrication update
- Received all Crytur crystals from second order + 5 more from pool
- Ordered 50 more, to arrive March/April
- All crystals wrapped, some wrapping for earlier modules have been fixed
- Ran short of strips for brazing, have been ordered
- PMT housing bottleneck, expect more to arrive this week
- Some PCB alignments needed to fixed (need to be vertical)
- Grand total fabricated modules=1153, need to do inventory, prepare shelves for move to new space in EEL (still under construction)
- Arshak working on studying and trying to improve light uniformity over the extent of the plexiglas for the LMS
- Tried different reflectors on wide face of plexiglas
- Still more intense near boundaries
- Try LEDs instead of fibers? Try more fibers?
- Need to set deadline for going with this approach as opposed to HyCAL method.