LHC BGI HV Feedthrough and Connector Discussion

Tuesday 21 Apr 2026, 10:00 → 11:00 Europe/Zurich

865/1-B03 (CERN)

Gunn Khatri (CERN), James Storey (CERN), William Andreazza (CERN)

Draft

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)

10:00 → 10:20 Presentation by Lauren

see the minutes

Speakers: Lauren Karen Margerison, William Andreazza (CERN)