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Observation reveals improved efficiency in plasma microwave amplifiers, suggesting extended absorbers can reduce self-excitation effects.
The problem of radiation amplification in a plasma microwave amplifier with coaxial geometry with an absorber is considered. The role of the absorber is to suppress parasitic feedback, which can lead to self-excitation of the system, while the presence of the absorber leads to a modification of its electrodynamic properties. Spatial increments of beam-plasma instability are calculated and regions of parameters are determined when self-excitation of amplifier does not occur. Influence of absorber on efficiency of conversion of kinetic energy of electrons into energy of microwave oscillations is estimated.
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I. N. Kartashov (2025) studied this question.
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