Couplers for extracting RF power from a gyrotron cavity directly into fundamental mode waveguide
AssigneeVarian Associates, Inc.
InventorsRobert L. Ives, Howard R. Jory, Albert D. LaRue
Life of this patent
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Abstract
In a gyrotron cavity resonator, generated energy is extracted into a symmetric set of fundamental-mode waveguides by ports disposed to couple energy in phase from the operating electromagnetic mode but in anti-phase with respect to an unwanted mode of lower cutoff frequency than the operating mode, thereby neutralizing coupling to the unwanted mode. A second set of interspersed ports may be disposed to load degenerate, orthogonal modes.
Claims13
A gyrotron comprising an interaction cavity for supporting a transverse electric field wave in a higher-order mode in a cavity resonator in energy-exchanging relation with an electron beam, means for extracting electromagnetic energy from said cavity into the fundamental modes of a plurality of waveguides, said means comprising at least a pair of coupling apertures in the cavity wall located at positions where the wall currents of said higher-order mode are equal in amplitude and phase, and the wall currents of an unwanted lower-order mode are equal in amplitude and phase, but reversed in direction between said apertures with respect to said wall currents of said higher-order mode.
Dependencies are inferred from the claim text.