CEBAF Warm Window Replacement

A retrofit window design was adapted from FEL and Upgrade window

  • Ceramic brazed into Kovar eyelet, brazed to SS flange

Original warm windows were Teflon and polyethylene

  • Subject to gas permeation
  • Signs of plastic-flow aging
  • Several have leaked

Successfully changing out CEBAF rf windows during maintenance downs

  • Cryomodule warmed to ~30 K
  • Waveguide vented and work performed in helium atmosphere
  • Avoids mechanical stress on indium joints.