Difference between revisions of "October 19, 2022 FCAL Insert Installation Meeting"
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== Minutes == | == Minutes == | ||
| − | + | * Reviewed minutes from previous meeting | |
| − | + | * Sasha showed wiki page he started for FCAL2 installation | |
| − | + | ** gave 7 possible categories of condition of existing glass modules | |
| + | ** Lead glass modules have aluminum towards glass | ||
| + | ** Crystals have mylar towards crystal | ||
| + | ** Sasha estimates 40 minutes to rewrap a module with proper training | ||
| + | ** Need to determin qty or al mylar, silicone sheet and what else needs to be procured | ||
| + | ** Suggested students can do wrapping | ||
| + | ** Showed HV and current for each existing module | ||
| + | ** maybe 2 people from Cuevas to help with unstacking and stacking | ||
| + | ** Tech group will have availability during this time | ||
| + | ** Detector support group may have folks available to help | ||
| + | * Sasha needs more time for cable mapping - will make separate meeting | ||
| + | * Mark Dalton presented status of existing modules in 4 categories | ||
| + | ** 187 original bases saturated | ||
| + | ** 206 new bases saturated | ||
| + | ** 1018 new bases < 1790V | ||
| + | ** 1309 original bases < 1790V | ||
| + | * Possibility to mark prior to removal | ||
| + | * Maybe perform stress test on existing modules to see condition prior to removal | ||
| + | * Maybe remove bad bases before unstacking - need to plug end so pmt does not fall out | ||
| + | * Have about 50 good spare pmts besides 400 that will not be used | ||
| + | * discussed pre-sorting as removing from stack vs. just toss them in a bin for sort later | ||
| + | * Need to work out sorting procedure to determine required shelving | ||
| + | * do we also wish to inspect from US side prior to unstacking to label cracked or brown ones? | ||
| + | * Chris S. ordered 1600 RG174 signal cables and connectors - 20 weeks - $83K | ||
| + | * Have all external HV cables on connectors - they still need to be attached | ||
| + | * Lengths are needed for all HV and LV cables inside dark room | ||
| + | * LV cables are ribbon cables inside dark room | ||
| + | ** No daisy chaining | ||
| + | ** Can we reduce to 3 wire instead of 10 to save space? | ||
| + | * Monitoring Panel | ||
| + | ** fibers have about a 1" bending radius with 10% loss in signal | ||
| + | ** Leave clearance on side edges of Rohacell to allow fibers to come out and bend around US surface of outer monitoring panel | ||
| + | ** Outer plexiglass and rohacell can be held together using plastic push pins | ||
| + | ** Need to get details from Matt S. for outer LED attachments | ||
| + | ** discussed need for gasket on from brass face of each crystal to reduce possibility of cross talk | ||
| + | ** Sasha discussed changing to individual fibers for each crystal | ||
| + | *** is this needed for calibration? | ||
| + | *** what is the requirement for the monitoring system? | ||
| + | *** continue with the current design | ||
| + | *** Final decision needed by December | ||
| + | *** Arshack doing more studies | ||
| + | * Cable trays to be determined once cable configuration is defined | ||
== Action Items == | == Action Items == | ||
Revision as of 07:31, 21 October 2022
Meeting Time and Place
Wednesday October 19, 2022 10am At Jefferson Lab, Hall D Counting House and on Teams
Agenda
- Minutes from last meeting https://halldweb.jlab.org/wiki/index.php/October_05,_2022_FCAL_Insert_Installation_Meeting
- Discuss Lead Glass and crystal module removal/install [1] - Sasha
- Discuss cable mapping - Sasha
- Existing cables
- New Cables
- Cable quotes Chris S.
- Patch Panel requirements
- Initial testing of modules before removal - Mark D.
- Revisited removal of darkroom -
- All cables need to be removed from darkroom to be able to install new detector
- may be able to only partially remove Framing
- Maybe able to crane frame off platform partially assemble
- Rework for patch panels
- Updated Schedule
- Monitoring system discussion
- Assembly in ESB
- Media:FCAL2_strawman_schedule.pdf
Minutes
- Reviewed minutes from previous meeting
- Sasha showed wiki page he started for FCAL2 installation
- gave 7 possible categories of condition of existing glass modules
- Lead glass modules have aluminum towards glass
- Crystals have mylar towards crystal
- Sasha estimates 40 minutes to rewrap a module with proper training
- Need to determin qty or al mylar, silicone sheet and what else needs to be procured
- Suggested students can do wrapping
- Showed HV and current for each existing module
- maybe 2 people from Cuevas to help with unstacking and stacking
- Tech group will have availability during this time
- Detector support group may have folks available to help
- Sasha needs more time for cable mapping - will make separate meeting
- Mark Dalton presented status of existing modules in 4 categories
- 187 original bases saturated
- 206 new bases saturated
- 1018 new bases < 1790V
- 1309 original bases < 1790V
- Possibility to mark prior to removal
- Maybe perform stress test on existing modules to see condition prior to removal
- Maybe remove bad bases before unstacking - need to plug end so pmt does not fall out
- Have about 50 good spare pmts besides 400 that will not be used
- discussed pre-sorting as removing from stack vs. just toss them in a bin for sort later
- Need to work out sorting procedure to determine required shelving
- do we also wish to inspect from US side prior to unstacking to label cracked or brown ones?
- Chris S. ordered 1600 RG174 signal cables and connectors - 20 weeks - $83K
- Have all external HV cables on connectors - they still need to be attached
- Lengths are needed for all HV and LV cables inside dark room
- LV cables are ribbon cables inside dark room
- No daisy chaining
- Can we reduce to 3 wire instead of 10 to save space?
- Monitoring Panel
- fibers have about a 1" bending radius with 10% loss in signal
- Leave clearance on side edges of Rohacell to allow fibers to come out and bend around US surface of outer monitoring panel
- Outer plexiglass and rohacell can be held together using plastic push pins
- Need to get details from Matt S. for outer LED attachments
- discussed need for gasket on from brass face of each crystal to reduce possibility of cross talk
- Sasha discussed changing to individual fibers for each crystal
- is this needed for calibration?
- what is the requirement for the monitoring system?
- continue with the current design
- Final decision needed by December
- Arshack doing more studies
- Cable trays to be determined once cable configuration is defined
