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In this paper the authors consider the planar model of the FEL with a hybrid resonator consisting of two Bragg structures with different operating features: an upstream (cathode-side) advanced and a downstream (collector-side) traditional Bragg reflectors. Mode control in the transverse direction is achieved in the upstream advanced Bragg reflector due to additional transverse electromagnetic energy...
A planar narrow band Bragg reflector based on coupling of propagating and quasi-cutoff modes is considered. Coupled waves analysis together with direct numerical simulations demonstrate the operability of novel scheme up to THz frequency band.
A new type of a high selective Bragg resonator having a step of corrugation inside the interaction region was used as a microwave system for a free-electron maser (FEM). Using a linac LIU-3000 to drive the FEM-oscillator a single-mode single-frequency operation was achieved at a frequency of 30.74 GHz with an output power of about 50 MW, which corresponded to a record efficiency of 35% for a millimeter...
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