Development of a Generator of a Periodic Sequence of Ultrashort 8-mm Electromagnetic Pulses Based on the “Saturn” Accelerator with Two Coaxial Emitting and Absorbing Electron Beams

We analyze theoretically and model a generator of a periodic sequence of ultrashort microwave pulses in a scheme with two coaxial cylindrical electron beams formed by the “Saturn” accelerator (Institute of Applied Physics of the Russian Academy of Sciences). An external cylindrical beam, as it moves rectilinearly along a periodic slow-wave system, ensures amplification of the radiation, whereas the internal near-axis beam ensures nonlinear cyclotron absorption. The modeling includes both the electron wave interaction and the formation of two electron beams in a common cathode unit, as well as their transportation in a common vacuum volume. It is shown that at a voltage of 210 kV and currents of 6.0 A and 4.4 A of the amplifying and absorbing beams, respectively, generation of 8-mm pulses with a duration of 650 ps, a peak power of 540 kW, and a repetition rate of 3.3 ns is possible.