LHC BGI HV Feedthrough and Connector Discussion

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865/1-B03 (CERN)

865/1-B03

CERN

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Gunn Khatri (CERN), James Storey (CERN), William Andreazza (CERN)
HL-LHC BGI meetings
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65961147691
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Gunn Khatri
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Participants: William, Lauren, Gunn, Mark, Wilfried
Mechanical:
  • Compact solution using existing HV feedthrough + short cable + sealed 90° bending box* mounted on BGI tank
  • Box*: RF tight, removable back panel, internal G10 insulation
  • Minimum bending radius of HV cable respected using rigid support (William)
  • Simple stainless steel test flange (rectangular, no knife edge) for HV tests can be provided
  • Lauren to create 3D model, check space between tank and magnet aperture, iterate with XEI
Electrical:
  • No commercial solution meets compact + 50 Ω + non-magnetic requirements
  • Short non-50 Ω section (~10 cm max), then transition via 3Y LEMO to 50 Ω cable
  • HV insulation: ~2 mm/kV guideline (~60 mm for 30 kV), use insulated cable + HV putty tape
  • RF validation via stretched wire method on final instrument
  • Front-end cooling HV box: active or passive cooling options
Actions:
  • Wilfred: retrieve HV cable samples (Stephane storage), check LEMO compatibility - DONE, 3Y Series not compatible with new HV cable
  • Lauren: 3D model and space validation
  • Mark: back-end box design (50 Ω termination + cooling)
  • Gunn: HV simulations (fields, triple points, breakdown)
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