High-power microwave oscillator of microsecond pulse duration driven by relativistic electron beam

The report is devoted to the problem of increasing of RF pulse duration in high-power microwave devices driven by relativistic electron beam. We studied the possibility to design a microwave source of microsecond pulse duration, usually restricted by plasma generation due to a few reasons. It is shown that the breakdown is determined by microwave discharge, initiated, in turn, by electron beam destruction and bombardment of the slow-wave structure walls. To depress the process of plasma accumulation we propose to apply HPM oscillator with axially-symmetrical TE-type mode.