THz polarization radiation from electrons passing corrugated dielectric tube under non-central propagation

In this work we construct the theory of THz polarization radiation from electrons passing corrugated dielectric tube under non-central propagation. Fully analytical description of spectral and angular properties of radiation is obtained. In calculations we used the method of polarization currents combined with theory of perturbations assuming small distances from the central axis of the tube. Smith-Purcell and Cherenkov mechanisms of radiation are considered and analysed numerically.