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Dynamics of interaction of longitudinal modes in a FEM oscillator with a broad-frequency-band feedback system and a klystronlike interaction region is studied. It is shown that the use of the klystronlike interaction region results both in increasing the efficiency of electron energy extraction and decreasing the number of competing modes. The latter provides a significant increase of the electron-current threshold of stability of the single-mode operation

Spatiotemporal dynamics of a free electron maser oscillator with broadband feedback and klystronlike interaction region