Self-consistent three-dimensional RF-gun dynamics integration based on the Lienard-Wiechert retarded potentials

In this contribution we will consider some key issues in the design of a three-dimensional (3D) code devoted to the simulation of charged beam transport in RF photoinjectors. The inclusion of space-charge fields is obtained by means of the Lienard-Wiechert retarded potentials. This technique represents an alternative to the self-consistent algorithm of the particles in cells type (PIC) which is extremely expensive in terms of CPU time and memory requirements. We present some preliminary results on the emittance growth induced by off-axis beam injection.