Relativistic BWO With Linearly Polarized Gaussian Radiation Pattern

An X-band relativistic backward wave oscillator (BWO) is proposed to provide high-power Gaussian radiation that is attractive for many applications. A Bragg reflector with combined single-fold left- and right-spiral corrugations of its wall was applied to the cathode end of the interaction space. Such a reflector converts the operating backward TM
₀₁
-mode of the BWO to the forward TE
₁₁
-mode with linear polarization that is extracted as a Gaussian microwave beam. Frequency tuning over 6% with radiation power 100-350 MW is achieved by varying the magnitude of the guide magnetic field. Computer simulations were used to analyze BWO operation.