Difference between revisions of "JEF meeting, February 3, 2023"
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** [https://userweb.jlab.org/~aasatury/Fcal_LMS/500mkm_fiber/ 500mkm Fiber tests] | ** [https://userweb.jlab.org/~aasatury/Fcal_LMS/500mkm_fiber/ 500mkm Fiber tests] | ||
* '''Simulations/Analysis''' | * '''Simulations/Analysis''' | ||
+ | |||
+ | =Minutes= | ||
+ | Attendees: Igal, Zisis, Sasha, Igor, Arshak, Phil, Olga, Liping, Azizah, Jon, Malte, Mark D., Jane, Axel, S.T. | ||
+ | * George from detector support group disassembling COMCAL modules: 10 unwrapped, removed caps for fiber insertinon | ||
+ | * ~60 SICCAS crystals ready for rewrapping | ||
+ | * Some PMT housings still missing -- may need to reorder | ||
+ | * 1420 FCAL-2 modules have been assembled to date | ||
+ | * 5x5 prototype of patch panel for LV distribution has been fabricated | ||
+ | ** Install in Hall for testing with beam | ||
+ | ** Plan for full scale design is for 4 long patch panels on each side of beam pipe | ||
+ | ** LV/HV/signal cables will be separated into different patch panels | ||
+ | ** LV will be supplied by unshielded ribbon cables w/ 8 lines, only using 3 -- consider shielded alternative? | ||
+ | * List of summer students (~10 so far) coming together | ||
+ | * Discussed graduate student and postdoc involvement (after construction: data anlysis, calibration, etc.) | ||
+ | * Malte will give a talk at the collaboration meeting on current FCAL plans and preparations for lead glass | ||
+ | * Sasha will give the FCAL-2 talk, including a couple of slides on the LMS | ||
+ | ** Plexiglas is a viable solution, but with a small amount of cross talk | ||
+ | ** Fiber option: no cross talk, but need to confirm light uniformity is good enough | ||
+ | * LMS update: Arshak completed tests using individual 500 micron diameter fibers | ||
+ | ** Made 64 fiber bundle, one end at integrating sphere, the other individual separated holes in test setup | ||
+ | ** Uniformity at ~15-20% level, better than 250 micron fibers, with more light | ||
+ | ** Need to put fibers into donuts to attach to crystals | ||
+ | ** Need to make large bundle with sufficient spares (total number of fibers 1650-1700? Need 1596.) | ||
+ | ** Do we need multiple LED wavelengths? Useful for monitoring radiation damage. | ||
+ | ** Add time-stable reference? Americium source. Also for FCAL. Malte suggested adding a fiber to each of the 4 existing plexiglas plates for use later. | ||
+ | * LMS will add material in front of the insert and would make putting foam support upstream of the insert in the recess difficult | ||
+ | * Existing FCAL plexiglas needs to be modified for the new hole. | ||
+ | ** Inspect after removal, may need to replace | ||
+ | * Expect electronics for LMS to be same as for DIRC/COMCAL |
Revision as of 09:24, 6 February 2023
Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Zoom meeting ID: 161 050 9142 Passcode: 004965
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)
- 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)
- Received all 150 CRYTUR crystals from physics division (22-C0275) [1]
- Module fabrication -- Sasha
- Fabricated modules: Total 1420 (7 modules fabricated since last week)
- 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
- Simulations/Analysis
Minutes
Attendees: Igal, Zisis, Sasha, Igor, Arshak, Phil, Olga, Liping, Azizah, Jon, Malte, Mark D., Jane, Axel, S.T.
- George from detector support group disassembling COMCAL modules: 10 unwrapped, removed caps for fiber insertinon
- ~60 SICCAS crystals ready for rewrapping
- Some PMT housings still missing -- may need to reorder
- 1420 FCAL-2 modules have been assembled to date
- 5x5 prototype of patch panel for LV distribution has been fabricated
- Install in Hall for testing with beam
- Plan for full scale design is for 4 long patch panels on each side of beam pipe
- LV/HV/signal cables will be separated into different patch panels
- LV will be supplied by unshielded ribbon cables w/ 8 lines, only using 3 -- consider shielded alternative?
- List of summer students (~10 so far) coming together
- Discussed graduate student and postdoc involvement (after construction: data anlysis, calibration, etc.)
- Malte will give a talk at the collaboration meeting on current FCAL plans and preparations for lead glass
- Sasha will give the FCAL-2 talk, including a couple of slides on the LMS
- Plexiglas is a viable solution, but with a small amount of cross talk
- Fiber option: no cross talk, but need to confirm light uniformity is good enough
- LMS update: Arshak completed tests using individual 500 micron diameter fibers
- Made 64 fiber bundle, one end at integrating sphere, the other individual separated holes in test setup
- Uniformity at ~15-20% level, better than 250 micron fibers, with more light
- Need to put fibers into donuts to attach to crystals
- Need to make large bundle with sufficient spares (total number of fibers 1650-1700? Need 1596.)
- Do we need multiple LED wavelengths? Useful for monitoring radiation damage.
- Add time-stable reference? Americium source. Also for FCAL. Malte suggested adding a fiber to each of the 4 existing plexiglas plates for use later.
- LMS will add material in front of the insert and would make putting foam support upstream of the insert in the recess difficult
- Existing FCAL plexiglas needs to be modified for the new hole.
- Inspect after removal, may need to replace
- Expect electronics for LMS to be same as for DIRC/COMCAL