Leaky wall filter for use in extended interaction klystron

摘要

A leaky wall filter for use in an EIK comprises a plurality of guidelets intersecting perpendicularly with a wall of an output waveguide of the EIK. The guidelets would propagate 2 pi mode oscillation frequencies from the EIK out of the output waveguide. A load matched to the 2 pi mode disposed at the end of the guidelets provides termination for the 2 pi mode oscillation frequencies and prevents the initiation of oscillation. The load comprises a plenum disposed at an end of the guidelets opposite to the output waveguide, a window having a first surface within the plenum, and a water load provided at a second surface of the window. The 2 pi mode oscillation frequencies propagating through the guidelets are impedance matched by the window and coupled into the water load for termination. Since a portion of the operating frequency power also leaks through the guidelets into the plenum due to insertion loss, this combined RF power also couples into the water load and is converted into thermal energy. A fluid circulation system is provided to remove the thermal energy from the water load. The window is comprised of alumina ceramic which effectively couples the 2 pi mode oscillation frequencies and RF power into the water load.