Difference between revisions of "JEF meeting, August 19, 2022"
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** [https://halldweb.jlab.org/wiki/index.php/FCAL_2_Design_Meetings Link to the earlier design meetings] | ** [https://halldweb.jlab.org/wiki/index.php/FCAL_2_Design_Meetings Link to the earlier design meetings] | ||
* Light Monitoring System -- Arshak | * Light Monitoring System -- Arshak | ||
+ | |||
+ | =Minutes= | ||
+ | Attendees: Igal, Liping, Arshak, Sasha, Tegan, Zisis, Jon, Jane, Phil, Azizah, Olga, S.T. | ||
+ | * Azizah gave an update on using multi-variate analysis to separate true photons coming from the primary interaction with the target and split-offs due to other interactions | ||
+ | ** Used photons from π0 decay from the reaction &omega&tarrarπ+π-π0 | ||
+ | ** Compared response for FCAL-1 and FCAL-2 geometries | ||
+ | *** Followed approach used by Indiana group for FCAL-1 | ||
+ | *** Largest differences between FCAL-1 and FCAL-2 seen in sum-V variable | ||
+ | *** For insert region, also saw differences in the timing variable | ||
+ | ** Need to study over/undertraining? | ||
+ | * Zisis mentioned he had a new student working on machine learning using image processing | ||
+ | * Sasha/engineering group/elecronics group periodically meet about installation plan for FCAL-2 (move to more regular meetings?) | ||
+ | ** Stacking coordination, quality checks | ||
+ | ** Refurbishment of FCAL-1 modules | ||
+ | * Will order 20 crystals this fiscal year | ||
+ | * Need to disassemble COMCAL to meet 1600 crystal need | ||
+ | * Module fabrication continues -- previous week was last week for students | ||
+ | ** 1206 completed! | ||
+ | ** Still need various components: brass assemblies, light guides, PMT housing | ||
+ | * Sasha working on contract with GWU for testing PMT dividers | ||
+ | * Arshak continues to work on LMS system to make the light distribution more uniform across the plexiglas plate | ||
+ | ** Switched to LEDS attached to plexiglas -- response flatter but still 3x higher light intensity near edges (was ~60x using fibers) | ||
+ | ** Goal for uniformity: 10-15% difference | ||
+ | ** Try to make final decision regarding approach (FCAL method vs individual fibers to each crystal?) in 3-4 weeks | ||
+ | ** Want to monitor light source itself as well -- reference PMT? | ||
+ | ** Try out diffusion box idea? |
Revision as of 08:21, 22 August 2022
Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Zoom meeting ID: 161 050 9142 Passcode: 004965
Agenda
- Simulations/Analysis
- FCAL2 Photon Classification Feature Space -- Azizah
- True photons and splitoffs present differently in the FCAL and FCAL2.
- FCAL2 Photon Classification Feature Space -- Azizah
- Preparation of parts for FCAL2 modules -- Sasha
- Crystals. [1] Discuss possibility to order 20 more CRYTUR crystals during this F.Y. Have already received 5 more crystals from physics division].
- currently available/ordered + CCAL: 1593 + (9) (need more spares)
- Meeting with the DSG group: Mindy and George will continue working on the project in September
- Preparation of parts[2][3][4]. Remaining components:
- 300 brass assemblies (Keith and Chris will continue to work on them, waiting for straps)
- 200 light guides, will be delivered during a couple of next weeks.
- 400 PMT housings, expect to receive during next two months (bottleneck now)
- Wrapped CRYTUR crystals: 682
- All currently available
- Crystals. [1] Discuss possibility to order 20 more CRYTUR crystals during this F.Y. Have already received 5 more crystals from physics division].
- Module fabrication -- Sasha
- Received 72 PMT housings from Tim a couple of days ago; used practically all of them
- Status of fabrication
- Fabricated modules: Total 1206 (a new milestone)
- All SICCAS 576 SICCAS
- 630 CRYTUR, Remaining: 52
- Clean room EEL126 [5][6]
- Expect to move to the new lab EEL108 (the same building) [7]
- Work on amending safety docs
- All students will leave during this week (11 students have been working on the project during this summer)
- Great job !
- (had also a chance to work on the CCAL project [8])
- Updates from the FCAL installation meetings with Tim's group -- Sasha
- Light Monitoring System -- Arshak
Minutes
Attendees: Igal, Liping, Arshak, Sasha, Tegan, Zisis, Jon, Jane, Phil, Azizah, Olga, S.T.
- Azizah gave an update on using multi-variate analysis to separate true photons coming from the primary interaction with the target and split-offs due to other interactions
- Used photons from π0 decay from the reaction &omega&tarrarπ+π-π0
- Compared response for FCAL-1 and FCAL-2 geometries
- Followed approach used by Indiana group for FCAL-1
- Largest differences between FCAL-1 and FCAL-2 seen in sum-V variable
- For insert region, also saw differences in the timing variable
- Need to study over/undertraining?
- Zisis mentioned he had a new student working on machine learning using image processing
- Sasha/engineering group/elecronics group periodically meet about installation plan for FCAL-2 (move to more regular meetings?)
- Stacking coordination, quality checks
- Refurbishment of FCAL-1 modules
- Will order 20 crystals this fiscal year
- Need to disassemble COMCAL to meet 1600 crystal need
- Module fabrication continues -- previous week was last week for students
- 1206 completed!
- Still need various components: brass assemblies, light guides, PMT housing
- Sasha working on contract with GWU for testing PMT dividers
- Arshak continues to work on LMS system to make the light distribution more uniform across the plexiglas plate
- Switched to LEDS attached to plexiglas -- response flatter but still 3x higher light intensity near edges (was ~60x using fibers)
- Goal for uniformity: 10-15% difference
- Try to make final decision regarding approach (FCAL method vs individual fibers to each crystal?) in 3-4 weeks
- Want to monitor light source itself as well -- reference PMT?
- Try out diffusion box idea?