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

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== Minutes and Action Items ==
 
== Minutes and Action Items ==
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* Inner Tube
 
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** ok to use 2mm wall
 
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* Acrylic Monitoring sheet
 
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** make 1/2" thick with 6mm bevel on outer edges only
 
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** Drill holes with diamond end mill for polished bottom
 
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** 1mm fiber probably ok
 
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** look at putting a rubber gasket on end flange of modules to prevent cross talk
 
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** make test piece Determine size to fit in dark box 15cm square with 6mm bevel - Tim
 
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* Cooling Manifold
 
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** Need to make sure there is room to replace FCAL module electronics
 
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** Need humidity control in dark room
 
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* Electronics Patch Panels
 
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** Fernando informed us that a 48 wire cable will be used for HV
 
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** HV cables carries 48 individual wires, large bend radius [[Media:Radiall_connector.pdf]]
 
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** PCB mounted connector to bring power from Radiall to individual bases [[Media:SamtekHV.pdf]]
 
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** still need 1600 signal connectors on patch panel using same connectors as ComCal
 
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** Layout separate HV and signal patch panels - Keith
 
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** Determine length of cables - All
 
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* Develop Installation/Assembly sequence for detector - Keith
 
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* Module testing
 
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** Need to verify verify 25um strap is strong enough - Josh
 
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** Procure 1 in-oz torque driver - Tim
 
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** Procure 18mm acrylic light guide - cut and polish - Tim
 
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** Work with Amco 50-50 solder to prove it is good - Josh
 
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** Determine cookie geometry - Josh
 
  
 
== Action items ==
 
== Action items ==

Revision as of 08:51, 9 October 2019

Meeting Time and Place =

Wednesday Oct, 9 1:30 pm At Jefferson Lab, room TED 2504

  • Present - Sasha Somov, Josh Crafts, Eugene, Stephanie, Keith Harding, Tim, Fernando, Chris Stanislav

Agenda

  • Action items from last meeting https://halldweb.jlab.org/wiki/index.php/September_25,_2019_FCAL_Insert_Design_Meeting
  • Discuss Tungsten absorber
    • Cover 1.5 crystals ok?
    • Rohacell supported
  • Monitoring System
    • Use 1/2" Acrylic sheet with 45 degree angles on edges
    • Testing plan
    • 1mm fibers
    • 15cm square with 6mm 45 degree bevel
  • 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 - removable plate
    • Proposed manifold similar to BCAL - needs to clear for FCAL module removal
  • Support structure and assy sequence
  • electronics patch panels DS of crystal pmts
  • Discussed Brazing of PMT module straps and new mag field tests
    • Sasha wishes to assemble a new 9 module array for magnetic field testing
      • 18mm diameter light guides are needed - josh found some on Amazon - tim will order
      • 6mm longer with 50 micron larger ID mag shield steel needed - Submitted to machine shop Media:1020_shield.pdf
      • additional mu metal shields needed (same as previous - 350 microns) - Tim ordered Due Oct 18-
      • Have steel shields annealed - Tim looking into it >900C
  • Discuss test fixture for PMTs in beam
    • Need to fabricate steel case - Media:Steel_shield.pdf
    • need to fabricate support structure - Tim
    • Need to fabricate feedthru panel - Josh/Tim
    • need to fabricated aluminum base plate - Josh/Tim

Minutes and Action Items

Action items

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