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

The example of transit clystron is used to consider a combined perturbation of a one-dimensional electron beam. At the beginning, the current density is amplitude modulated (static control) and, subsequently, the electron velocities are modulated (dynamic control). For large ratios of the control frequencies, a computer was used to calculate the spectral characteristics of the convection current at the entrance to the power takeoff device. The calculations show that it is possible to use a low-frequency amplitude premodulation to increase the electron efficiency of clystron-type pulsed devices which operate in the amplification or frequency multiplication regimes.