Calculation of the frequency spectrum of an electron beam in a klystron with premodulation

The combined modulation of the electron beam in a klystron with a triode gun is considered. Amplitude modulation of current density (static control) is followed by modulation of electron velocities (dynamic control). The spectral characteristics of the convection current at the input of the energy-extraction device are calculated for large ratios of the dynamic and static control frequencies. Calculations point to the possibility of using low-frequency preliminary amplitude modulation to enhance the electronic efficiency of pulsed klystrons, operating both in the amplification and frequency-multiplication modes.