SASE X-ray radiation via Lienard-Wiechert fields

We present three-dimensional numerical results of self-amplified X-ray wiggler radiation from a relativistic electron beam using Lienard-Wiechert forces to drive self-consistently the motion of electrons. The exact three-dimensional self-consistent motion of a beam of electrons gives rise to exact three-dimensional radiation fields which can be calculated with very few approximations. As an example of this approach, we report here results of three-dimensional X-ray coherent wiggler radiation calculations for a short relativistic electron pulse.