Radiation from an electron bunch flying over a surface wave

Radiation generated by the passage of a monoenergetic electron bunch above the surface wave excited in plane interface between homogeneous media with different dielectric constants is investigated. For the surface wave of gen eral profile the radiation intensity is expressed via the radiated power fr om a single charge and bunch form factor. Various types of transverse and l ongitudinal distributions of electrons in the bunch have been considered in cluding Gaussian, asymmetrical Gaussian, two Gaussian and rectangular distr ibution with asymmetrical exponential tails. Conditions are specified under which the coherent radiation essentially exceeds the incoherent part. (C) 2001 Elsevier Science B.V. All rights reserved.