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

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(Created page with "== 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....")
 
(Agenda)
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* Revisited removal of darkroom -  
 
* Revisited removal of darkroom -  
 
** All cables need to be removed from darkroom to be able to install new detector
 
** 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
 
** Maybe able to crane frame off platform partially assemble
 
** Rework for patch panels
 
** Rework for patch panels
* Updated Schedule
 
 
* Monitoring system discussion  
 
* Monitoring system discussion  
 
* Assembly in ESB
 
* Assembly in ESB

Revision as of 07:18, 2 November 2022

Meeting Time and Place

Wednesday November 02, 2022 10am At Jefferson Lab, Hall D Counting House and on Teams

Agenda

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

  • 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
      • Arshak doing more studies
  • Cable trays to be determined once cable configuration is defined

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