SLAC, Menlo Park, California, USA
Fermilab, Batavia, USA
The TTF3-style coupler is typically used to power 1.3 GHz TESLA-type superconducting cavities. For the US ILC program, parts purchased in industry for such couplers are received at SLAC where they are inspected, cleaned, assembled as pairs in a Class 10 cleanroom, pumped down, baked at 150 degC and rf processed. The pairs are then shipped to FNAL and installed in cavities that are then tested at input power levels up to 300 kW. This paper describes the coupler results to date including improvements to the procedures and efforts to mitigate problems that have been encountered. Also progress on building a cold coupler section without e-beam wielding is presented.
