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.
Fermilab, Batavia, USA
Fermilab makes use of a single-cavity test cryostat to assess the performance of dressed superconducting RF cavities using pulsed high-power RF before they are assembled into a cryomodule. Cavity performance is evaluated in terms of accelerating gradient, unloaded quality factor, and field emission. The functionality of auxiliary components such as tuners and fundamental power couplers is also verified. The latest results from extensive testing of nine-cell 1.3 GHz cavities are presented here, along with a discussion of future extensions of the horizontal test program to include 650 MHz cavities and continuous wave testing.