Difference between revisions of "JEF meeting, September 15, 2023"
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<!-- ** [https://halldweb.jlab.org/detectors/fcal2/installation/photos Disassembling FCAL] --> | <!-- ** [https://halldweb.jlab.org/detectors/fcal2/installation/photos Disassembling FCAL] --> | ||
*'''Light monitoring system''' -- Arshak | *'''Light monitoring system''' -- Arshak | ||
− | * | + | |
− | * | + | =Minutes= |
− | + | Attendees: Sasha, Arshak, Liping, Phil, Zisis, Igal, Jon, Olga, Bill, Jane, S.T. | |
− | + | * Students subdivided new batch of SICCAS crystals into "good, bad, maybe good enough?" categories | |
− | * | + | ** Selected ~30 good quality SICCAS crystals from last batch to replace low quality NPS crystals |
− | ** | + | * Fixed some issues (bumps due to soldering, loose tedlar) with fabricated PWO modules |
− | + | ** Refurbished 42 modules | |
− | + | * Final tests of first-article PMT dividers have been completed, green light given for production | |
+ | * Have installed 38/40 ECAL layers, some modules needed shims (used green tape) | ||
+ | * Malte found that many installed LG modules had broken PMTs | ||
+ | ** Observed that some divider boxes for LG modules are tilted: maybe squeezing/pushing caused glass to crack? | ||
+ | ** Adding extra inspection during installation, maybe need to realign boxes w.r.t. rest of LG module assembly | ||
+ | * Money to support TOF veto prototype in principle available | ||
+ | ** Also discussed fiber profiler (for measuring shower profile) + using spare crystals to make 5x5 array |
Latest revision as of 12:18, 18 September 2023
Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Connection information
Agenda
- Preparation of parts for ECAL modules -- Sasha
- Crystals:
- Received 1100 short signal cables [3]
- Procurement parts for the LMS:
- - Waiting for 7,600 ft of optical fibers. PR department prepared PO but forgot to send it out
- Module fabrication -- Sasha
- All modules have been fabricated, checked, and inventorized (about 1610 modules in total)
- Ongoing projects -- Sasha, all
- Visual inspections of fabricated modules [4] - done
- All crystals moved to Hall D[5] [6][7] - done
- Tested, labeled, and bundled all 100 (+ 2 spares) [8] signal cables connected from the flash ADC to the patch panel [9] - done
- Test and label 1100 short signal cables - ongoing
- Tested fabricated modules using LMS [10] - done (need to update the wiki page)
- Cutting optical fibers and gluing plastic caps [11], waiting for 7600 ft of optical fibers
- Report from students
- Refurbished (remove soldering bumps and rewrap) 42 modules. One more layer of the detector will be installed today.
- Need to wrap and fabricate about 30 modules using newly received crystals (will replace some already existing modules with low-quality crystals). Plan to finish with this during next week.
- Testing of PMT dividers -- Sasha / Vlad
- -Tested 6 dividers from the first batch. Asked to produce all remaining dividers. Expect to receive some of them in a couple of weeks
- Proceedures
- Installation of the FCAL2 detector & integration to GlueX -- Sasha / Arshak / Vlad / Hakob
- Detector installation [12][13][14]
- Detector installation page
- Updates from the meetings with Tim's group [15]
- Discussion of the FCAL2 installation procedures [16]
- Final mapping of low-voltage cables
- Mindy continues with wrapping crystals and soldering wires to sockets.
- Projects for summer students
- Summer Students (2023)
- Light monitoring system -- Arshak
Minutes
Attendees: Sasha, Arshak, Liping, Phil, Zisis, Igal, Jon, Olga, Bill, Jane, S.T.
- Students subdivided new batch of SICCAS crystals into "good, bad, maybe good enough?" categories
- Selected ~30 good quality SICCAS crystals from last batch to replace low quality NPS crystals
- Fixed some issues (bumps due to soldering, loose tedlar) with fabricated PWO modules
- Refurbished 42 modules
- Final tests of first-article PMT dividers have been completed, green light given for production
- Have installed 38/40 ECAL layers, some modules needed shims (used green tape)
- Malte found that many installed LG modules had broken PMTs
- Observed that some divider boxes for LG modules are tilted: maybe squeezing/pushing caused glass to crack?
- Adding extra inspection during installation, maybe need to realign boxes w.r.t. rest of LG module assembly
- Money to support TOF veto prototype in principle available
- Also discussed fiber profiler (for measuring shower profile) + using spare crystals to make 5x5 array