High-harmonic electron bunching in the field of a signal wave and the use of this effect in cyclotron masers with frequency multiplication

A method of organizing electron-wave interaction at the multiplied frequency of the signal wave is 3-Piece Gift Set proposed.This type of electron-wave interaction provides multiplied-frequency electron bunching, which leads to formation of an intense harmonic of the electron current at a selected multiplied frequency of the signal wave.This effect is attractive lipstick/lip gloss for the use in klystron-type cyclotron masers with frequency multiplication as a way to increase the output frequency and improve the selectivity.