Testing procedures and results of the prototype fundamental power coupler for the Spallation Neutron Source

High-power RF testing with peak power in excess of 500 kW has been performed on prototype fundamental power couplers (FPC) for the Spallation Neutron Source superconducting (SNS) cavities. The testing followed the development of procedures for cleaning, assembling and preparing the FPC for installation in the test stand. The qualification of the couplers has occurred for the time being only in a limited set of conditions (travelling wave, 20 pps) as the available RF system and control instrumentation are under improvement.