September 21, 2022 FCAL Insert Installation Meeting

Meeting Time and Place

Wednesday September 07,2022 10am At Jefferson Lab, Hall D Counting House and on Teams

Agenda

• Minutes from last meeting https://halldweb.jlab.org/wiki/index.php/September_07,_2022_FCAL_Insert_Installation_Meeting
• Discuss Lead Glass and crystal module removal/install - Sasha
• Crystal signal cable concept - Stephanie
• Cable mapping requirements - Fernando
  • Media:FCAL2_strawman_schedule.pdf
  • 

Minutes

• I showed the strawman schedule and then how to handle the lead glass modules. The discussion then went right into cabling, which was discussed for the duration.
• Sasha brought up the need for categorizing the existing modules before unstacking and then keep them separate.
  • Sasha to write a plan on how to categorize and repair the modules
    • determine existing problems
    • inspect as removed and decide which bin to go into
    • determine number of bins
    • those with no issues, keep whole
  • Crates can handle around 1500 lbs
  • should modules be removed from upstream or downstream?
  • Develop space plan based on Sasha'a plan (Tim)
• Cable discussion
  • How many new cable trays do we need (depends on plan)
  • 1600 new HV cables (through side wall patch panels)
  • 1600 new LV cables (through side wall patch panels) - ribbon cable daisy chained on inside?
  • 1200 or 1600 new signal cables depending if we reuse existing 400 cables
  • Do we remove all cables completely or just on detector end?
    • If only on one end?
      • the loose cables need to be supported and stowed somehow
      • little space left for work on platform
      • Less work for cabling folks
      • How to remove 400 existing signal cables
    • Remove cables completely?
      • Can remove racks so there is room to work on the platform
      • More work for cable folks
  • How to route and support additional cables?
    • Bring HV and LV cables from patch panel on side walls
      • Route them from top and bottom to center
    • Add additional chain in Z to handle additional cables
    • Use smaller diameter (RGA 174 (2.8mm diam.)) for signal cables?
      • Route through patch panel or connector from DS wall
      • bring along center pipe and fan out?
      • need to decide on connectors and length

Action Items

• Make a virtual 3D Mock up of baseline (Tim and Stephanie)
  • Assume HV and LV cables come from top and bottom
  • Assume signal cables are rg174 and patch in from downstream wall
  • Assume signal cables come along center pipe and fan out to crystals
  • Get samples of wires from Chris S. to use for model
• Develop an lead-glass module unstacking plan (Sasha)
  • Criteria for category of repairs
  • # of bins
  • repair plan
• Get quote on RG174 cables and connectors (Chris S.)
• Come up with cable mapping plan (Fernando)