Difference between revisions of "September 9, 2019 FCAL Insert Design Meeting"

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(Minutes)
(Minutes and Action Items)
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* Discussed Monitoring system
 
* Discussed Monitoring system
 
** Use 1/2" acrylic sheet same as FCAL
 
** Use 1/2" acrylic sheet same as FCAL
 +
** Discussed possibility of pre-assembling the acrylic, fibers and rohacell
 +
** Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim
 +
** Fabricate a test piece - Tim/Keith/Josh
  
 
== Action items ==
 
== Action items ==

Revision as of 15:03, 10 September 2019

Meeting Time and Place

Monday Sept 9 2pm At Jefferson Lab, room TED 2504

  • Present - Sasha Somov, Josh Crafts, Vlad, Eugene, Stephanie, Keith Harding, Tim

Agenda

  • Discuss 40x40 crystal assembly with 19 Lead glass modules around
    • Crystals move to 12.5 cm from US face of lead glass
    • 40x40 crystal matrix starts with shim to be able to go to 32x32 fairly easy.
    • Decision to pre-measure stacks of crystals and the existing FCAL to determine bottom row offsets
  • Discuss installing Rohacel US of crystals to fill hole and support the lead glass blocks
  • Discuss Tungsten absorber
    • Cover 1.5 crystals ok?
    • Rohacell supported
  • Monitoring System
    • Use Acrylic sheet, how thick?
    • How to attach fibers?
  • Cooling of blocks - 2.1 KW needed
    • 2 Chillers like those used for BCAL ($16K ea)
    • 4 water to air Heat exchangers around crystal area
    • 9 parallel circuits for each chiller
    • potted copper tube into aluminum blocks
    • Cooling of inner tube - removeable plate
  • electronics patch panels DS of crystal pmts
  • Brass strap soldering progress

Minutes and Action Items

  • Discussed the center support tube
    • Need to determine material for center tube - Sasha
      • consider magnetic properties, thermal conductivity, strength, stiffness
    • Need to determine the maximum hole size allowable (assume steel initially) - Tim
    • Need to move the upstream end flush with US side of acrylic sheet - Keith
    • Need to decide on size of hole (2x2 crystals now) - Sasha
  • Discussed Monitoring system
    • Use 1/2" acrylic sheet same as FCAL
    • Discussed possibility of pre-assembling the acrylic, fibers and rohacell
    • Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim
    • Fabricate a test piece - Tim/Keith/Josh

Action items