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Summary form only given. Intensive studies of operation of a coaxial high-power Free-Electron Maser (FEM) based on a two-dimensional distributed feedback are currently taking place at the University of Strathclyde. It has been demonstrated that highest output power and efficiency was achieved if the FEM two-mirror cavity was formed by a 2D Bragg (input mirror) and 1D Bragg structure (output mirror)...
We report the results of studies of operation of the coaxial FEM based on two-dimensional distributed feedback. The cavity formed with the novel Bragg structures has been used. The FEM output radiation is studied and output power is measured
A narrow-band Free-Electron Maser (FEM) oscillator with a Bragg resonator was operated in the reversed guide field regime. A high-current accelerator generated the 300keV, 30A, 100ns electron beam. Radiation at 32GHz frequency and 500kW power, corresponding to ∼5% efficiency, was measured. The measured FEM parameters agreed with predictions of a numerical simulation. The observed radiation frequencies...
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