December 02, 2021 CPP Design Meeting

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Meeting Time and Place

Thursday December 02, 2021, 3:00pm Bluejeans

  • Present - Elton, Dave, Stephanie, Ilya, Rory, Mark S, Beni, Simon, Mark I


  • Minutes from last meeting,_2021_CPP_Design_Meeting
  • Beam extend till December 21 - this will delay start of installation but we should be fine
  • Testing status - Beni/Elton
  • Design/Fab/Procurement status
    • Lead absorbers - Due in next week
    • All assembly hardware either here or due in by December
    • Test install in the TEDF High bay - use of 2 or 3 chambers
Cpp install chambers.pdf Cpp S&A chambers.pdf 
  • Installation/assy 3D Model and dwgs
    • LV attach
    • Scintillator orientation
    • assembly components - drawings released
    • Installation drawings in final review
    • Lead Target flattening media:Lead_target_pressing.pdf
  • Target Design in work
    Cpp target5.jpg
    Cpp target6.jpg
    Cpp target7.jpg
    Cpp target8.jpg
    • Most parts made (a good portion are 3D printed)
    • Will do a test assy by the end of the month

  • Things to work out
    • Gas system, manifold/bubblers (Beni has some)
    • Complete structural analysis - approved by Tom Renzo - need to release into system
    • Develop Detailed installation plan
    • Develop Design/operational/Maintenance Requirements
    • Modified US vacuum system
    • Solid target installation
    • Installation drawing including Microscope move
    • CPP Detector operations in Hall D OSP
    • Possible use of nitrogen flow for cooling electronics in Faraday cage


  • LV box details worked out
  • For fiducializing chambers, all four edges or bolt holes can be used to find center. Machining is very accurate
  • Rory wants 2 best chambers at the DS end
  • 4 scintillator paddles, 2 BL and 2 BR in vertical position equally spaced (15" oc). To be held by light guides, maybe a V block
  • Lead Target e pressed flat by Rory
  • Microscope move meeting scheduled for 3pm Tuesday

Action Items

  • Stephanie to design thinner "L" bracket for the LV box
  • Tim - Get with S&A group to discuss chamber fiducialization and alignment
  • Tim - add helium bag for inside CDC
  • Stephanie to model microscope move
  • Release installation drawings - Tim/Stephanie
  • continue work on target installation - Bobby