Difference between revisions of "November 02, 2022 FCAL Insert Installation Meeting"

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== Minutes ==
 
== Minutes ==
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* Reviewed minutes from previous meeting
 
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* Sasha showed wiki page he started for FCAL2 installation
 
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** gave 7 possible categories of condition of existing glass modules
 
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** Lead glass modules have aluminum towards glass
 
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** Crystals have mylar towards crystal
 
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** Sasha estimates 40 minutes to rewrap a module with proper training
 
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** Need to determin qty or al mylar, silicone sheet and what else needs to be procured
 
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** Suggested students can do wrapping
 
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** Showed HV and current for each existing module
 
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** maybe 2 people from Cuevas to help with unstacking and stacking
 
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** Tech group will have availability during this time
 
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** Detector support group may have folks available to help
 
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* Sasha needs more time for cable mapping - will make separate meeting
 
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* Mark Dalton presented status of existing modules in 4 categories
 
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** 187 original bases saturated
 
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** 206 new bases saturated
 
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** 1018 new bases < 1790V
 
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** 1309 original bases < 1790V
 
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* Possibility to mark prior to removal
 
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* Maybe perform stress test on existing modules to see condition prior to removal
 
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* Maybe remove bad bases before unstacking - need to plug end so pmt does not fall out
 
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* Have about 50 good spare pmts besides 400 that will not be used
 
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* discussed pre-sorting as removing from stack vs. just toss them in a bin for sort later
 
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* Need to work out sorting procedure to determine required shelving
 
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* do we also wish to inspect from US side prior to unstacking to label cracked or brown ones?
 
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* Chris S. ordered 1600 RG174 signal cables and connectors - 20 weeks - $83K
 
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* Have all external HV cables on connectors - they still need to be attached
 
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* Lengths are needed for all HV and LV cables inside dark room
 
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* LV cables are ribbon cables inside dark room
 
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** No daisy chaining
 
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** Can we reduce to 3 wire instead of 10 to save space?
 
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* Monitoring Panel
 
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** fibers have about a 1" bending radius with 10% loss in signal
 
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** Leave clearance on side edges of Rohacell to allow fibers to come out and bend around US surface of outer monitoring panel
 
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** Outer plexiglass and rohacell can be held together using plastic push pins
 
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** Need to get details from Matt S. for outer LED attachments
 
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** discussed need for gasket on from brass face of each crystal to reduce possibility of cross talk
 
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** Sasha discussed changing to individual fibers for each crystal
 
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*** is this needed for calibration?
 
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*** what is the requirement for the monitoring system?
 
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*** continue with the current design
 
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*** Final decision needed by December
 
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*** Arshak doing more studies
 
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* Cable trays to be determined once cable configuration is defined
 
  
 
== Action Items ==
 
== Action Items ==

Revision as of 07:26, 2 November 2022

Meeting Time and Place

Wednesday November 02, 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_19,_2022_FCAL_Insert_Installation_Meeting
  • Discuss Lead Glass and crystal module removal/install [1] - Sasha
  • 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
    • Maybe able to crane frame off platform partially assemble
    • Rework for patch panels
  • Cable discussion fruitful
    • Option D to move cables from inner 400 cables to adjacent crate
    • Remove 2 crates and move to new racks
    • Abandon 200 cables
    • Patch panels worked out, 2 HV and 2 LV north and south side, 1 signal feedthrough plate downstream wall
    • HV and LV cable length = 20 ft
    • Signal cable length = 16 ft
    • Cable trays for Signal all going N-S under platform
    • HV and LV cables al come from underneath also
  • Monitoring system discussion
  • Assembly in ESB
  • Media:FCAL2_strawman_schedule.pdf
Both step.jpeg
JBweld cooling test.jpeg
Glass module steps.jpeg
Work platform.png
Work platform top.png
Work platform iso.png
Work platform bird.png

Minutes

Action Items

  • Set up separate meeting for Cable mapping and requirements - Tim
  • Continue to work on unstacking, categorizing and repair plan - Sasha, Mark D.?
  • Develop layout for patch panels - Stephanie/Chris S
  • Continue to develop current monitoring design - Stephanie/Arshak
  • Work on cable tray layout - Tim/Stephanie
  • Provide lengths for HV and LV cables inside dark room - Tim/Stephanie
Retrieved from "https://halldweb1.jlab.org/wiki/index.php?title=November_02,_2022_FCAL_Insert_Installation_Meeting&oldid=116949"