An electron cyclotron maser based on anomalous Doppler effect(ADECM)with an initially axial beam velocity is considered,and the nonlinear equation of beam-wave interaction is presented.With the numerical methods,the nonlinear dynamics of the ADECM is investigated.It is shown that the saturated interaction efficiency of the ADECM approaches 90%and the interaction length for the saturated efficiency spans about 5–20 cm.The results may be of importance for designing a compact device in applications in microwave generations or microwave heating of ceramic laminates.
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