Planar relativistic subterahertz surface-wave oscillators based on two-dimensional periodic slow-wave structures

Using the theoretical analysis and three-dimensional PIC modeling, a project of a planar relativistic G-band surface-wave oscillator was developed based on the SINUKI high-current accelerator (IAP RAS, Nizhny Novgorod, 1 kA / 600 keV / 17 ns), powered by a sheet electron beam. The electrodynamic system of the oscillator is based on a two-dimensional periodic slow-wave structure implementing a two-dimensional distributed feedback mechanism and providing mode selection in three spatial coordinates. The conducted simulation shows the possibility of obtaining stable single-mode oscillation regime in the specified scheme with an efficiency of ~ 8%. The experiment demonstrated a stable single-mode regime at a frequency of 160 GHz with a pulse duration of up to 5 ns and an output power of ~ 30 MW.