Abstract
We report the first observation of sideband mode competition in a gyrotron with an overmoded open waveguide resonator. Experiments were conducted in a gyrotron operating in the ${\mathrm{TE}}_{16,2}$ mode at 146 GHz. Up to 600 kW of power was generated in 3-\ensuremath{\mu}s pulses at 80 kV beam voltage and up to 40 A beam current. A pair of sidebands was excited corresponding to the ${\mathrm{TE}}_{15,2}$ and ${\mathrm{TE}}_{17,2}$ modes offset by \ifmmode\pm\else\textpm\fi{}5 GHz. A multimode, multifrequency, self-consistent time-dependent code predicts the excitation of the sidebands with good accuracy.
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