X-band tunable relativistic BWO with linearly polarized Gaussian radiation

To provide high power Gaussian radiation that is attractive for many applications an X-band 460 kV relativistic BWO is proposed in which a Bragg reflector with one-fold left-and right-spiral corrugations of its wall was applied in waveguide on the “cathode” end of the interaction space. Such a reflector converts the operating TM₀₁-mode of the BWO to the forward TE11-mode with linear polarization that is extracted as a Gaussian microwave beam. Frequency tuning over 6% with radiation power ranging from 100 - 350 MW is achieved (in computer simulations) by varying the guide magnetic field.