High power input couplers are critically important components in all superconducting accelerators. Power couplers provide the vacuum and thermal interface between the superconducting cavity and the room temperature waveguide components and transmit RF power generated by the high power microwave source typically a klystron. Therefore, the input power couplers for these cavities are carefully designed and then prepared under very strict conditions. RF conditioning of input power couplers at room temperature is an important step in their preparation before mounting them on cavities. It allows one to test the robustness of the coupler, condition away residual absorbed gases and microscopic surface imperfections. The couplers are tested and conditioned in pairs using fully automated RF high power test stand at LAL-Orsay. The control and data acquisition of the conditioning is performed using an industrial PC and Lab View programming. In this paper we will present the results of the first XFEL power couplers manufactured by Thales and Research Instruments (RI).
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