HIGH POWER RF TESTS ON FUNDAMENTAL POWER COUPLERS FOR THE SNS PROJECT

The SNS is an accelerator-based spallation neutron source being built in Oak Ridge, Tennessee, in a partnership of six DOE laboratories. TJNAF has the responsibility for the superconducting linac, which will be built with medium (0.61) and high (0.81) beta cavities. A 50 ohm coaxial line with planar ceramic window was implemented. High power RF tests have been performed on the prototype couplers in a dedicated RF stand to verify that their specifications are met. This paper summarizes our results obtained so far at room temperature. After RF conditioning, the SNS fundamental power coupler prototypes have successfully passed RF levels well above the specifications. The couplers were operated in traveling wave at 750 kW with 1.3 ms duration at 60 Hz, and at 2 MW with 0.65 ms at 60 Hz.