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It has been noted in the past, in the study of the wall-roughness impedance,that a metallic pipe with corrugated walls supports propagation of ahigh-frequency mode that is in resonance with a relativistic beam. This modecan be excited by a beam whose length is a fraction of the wavelength. In thispaper, we study another option of excitation of the resonant mode in a metallicpipe with corrugated walls---via the mechanism of the free electron laserinstability. This mechanism works if the bunch length is much longer than thewavelength of the radiation.

Using pipe with corrugated walls for a sub-terahertz FEL