Radiation from an electron bunch flying over a surface wave

TL;DR

This paper investigates the radiation emitted by a monoenergetic electron bunch passing over a surface wave at a dielectric interface, deriving expressions for radiation intensity and analyzing various electron distribution effects.

Contribution

It provides a theoretical framework for calculating radiation from electron bunches over surface waves, including diverse distribution profiles and coherence conditions.

Findings

Radiation intensity expressed via single charge power and bunch form factor.

Conditions identified where coherent radiation surpasses incoherent radiation.

Analysis of different electron bunch distributions and their impact on radiation.

Abstract

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 general profile the radiation intensity is expressed via the radiated power from a single charge and bunch form factor. Various types of transverse and longitudinal distributions of electrons in the bunch have been considered including Gaussian, asymmetrical Gaussian, two Gaussian and rectangular distribution with asymmetrical exponential tails. Conditions are specified under which the coherent radiation essentially exceeds the incoherent part.