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Results are presented from experimental investigations of oscillatoryphenomena in an electron beam with a virtual cathode in a diode gap with adecelerating field. Experiments have revealed a stochastic broadband generationof the microwave oscillations of a virtual cathode in a decelerating field.Numerical simulations based on a simple one-dimensional model have shown thatthe onset of the stochastic generation and the broadening of the oscillationspectrum with increasing beam deceleration rate are governed by the processesof regrouping of the electrons in a beam with a virtual cathode.Comment: 15 pages, 12 figure

Experimental and theoretical investigations of stochastic oscillatory phenomena in a nonrelativistic electron beam with a virtual cathode