Influence of output window reflections on oscillatory processes in gyrotrons has been studied. The processes in a
gyrotron have been modeled numerically, and enhancement of the spectrum signal in the presence of reflections has
been studied. Dependencies of output power versus time and frequency spectrum for different value of reflection
coefficient are given. Possibilities of significant increasing of output spectrum are demonstrated experimentally. The
results demonstrate significant influence of reflections on operation stability and composition of the output radiation of
the gyrotron.
