November 04, 2021 CPP Design Meeting

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Meeting Time and Place

Thursday November 02, 2021, 3:00pm Bluejeans

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


Cpp install test1.jpg
  • Installation/assy 3D Model and dwgs
    • DS Chamber orientation?
    • Scintillator orientation?
    • assembly components - drawings released
    • Installation drawings in review
  • Target Design in work
    Cpp target1.jpg
    Cpp target2.jpg
    Cpp target3.jpg
    Cpp target4.jpg
    • 3cm bore ok?
  • 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


  • Elton will meet with Chris Stanislav Monday to discuss D connector
  • Elton requested the removal of the scintillator paddles from the collimator cave so they can be tested
  • All 8 chambers have been tested, 6 are good, Rory will come to the lab around Dec 13 to check the 2 noisy chambers
  • Most of the chamber data has been taken and the HV and gas turned off
  • The large lead absorber has been awarded and due in December. Lead from JLAB to be delivered to vendor Friday
  • Adjustable lead absorber due before Thanksgiving.
  • A test install of one of the 15,000 lb steel absorbers was accomplished on the stand in the TEDF high bay. Test went well with some lessons learned. Since the setup looks top heavy, we plan to stabilize the first section to the Darkroom when installed
  • Discussed Elton's plan for orientation of the chambers. Vertical chambers have x-ray port US and Horizontal chambers have xray port DS. Alternate vert/Horiz. DS most is now horizontal
  • We need to take a closer look at cable tray and vertical cable manager interference
  • Take a closer look to ensure cables clear tray
  • Discussed target geometry and design. OK to use 3 cm bore for target window.

Action Items

  • Remove scintillator paddles from Collimator cave (Mark S)
  • Bring lead sheets to vendor (Mark S)
  • Design stabilization for install of first assembly in Hall ( Stephanie)
  • Test install some chambers on absorbers in TEDF (Mark S)
  • Update 3D model with Elton's lates config. (Stephanie)
  • Verify Cables from DS chamber clear the cable trays ( Stephanie)
  • Work out plan with Nick on removing cables from vertical managers (Tim)
  • Continue target design (Bobby)