Investigation of processes in the retarding field oscillator with the virtual cathode

In this work an oscillator with the hot cathode executed on the basis of the two-gap resonator is investigated. The structure of the retarding field oscillator differs from the classical reflective klystron that the reflector is entered into interaction space of the resonator. It was experimentally confirmed that in the modified retarding field oscillator with the two-gap resonator excited at multiple resonant frequencies, the electronic efficiency can reach 30% that approximately in 10 times more, than in a usual reflective klystron.