Axisymmetric Resonance Reflector for Relativistic Gigawatt Backward-Wave Oscillators

We discuss the properties of the resonance reflectors applied in high-power relativistic backward-wave oscillators. The obtained results were used to develop a resonance reflector in the form of a section of a coaxial waveguide for a relativistic backward-wave oscillator operated in the ten-centimeter wavelength range. The results of preliminary experiments agree well with the calculations.