Abstract: This paper deals with the theoretical and experimental study of BWO using a high current electron beam. The dependencies of start length and the oscillation increments on the space charge parameters are obtained from the numerical analyze of the linear stage of transient process. For the actual experimental parameters in X-band, the duration of linear stage may be about 2 ns. The established oscillations in the nonlinear stage are steady-state over a wide range of beam current (varied by factor of 20). The further increase of current results in non-sinusoidal self modulation. The efficiency of the generator rises monotonously with the current and reaches approximately 25%. In the experiment, a compact nanosecond generator with the cathode voltage of up to 350 kV was used capable of operation at a repetition rate of up to 1,000 p.p.s. The pulsed magnetic system in which the coaxial magnetically insulated diode and the BWO slow wave structure are placed can be operated at 1 p.p.s. The microwave power was approximately 200 MW with the pulse duration of approximately 1 ns.!11
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