Electromagnetic simulations of photocathode sources using green~s function methods

Summary form only given. The inclusion of space-charge fields into beam simulations of photocathode sources can be challenging since the beam is typically tightly bunched (implying rapid spatial and time variations of the fields) and fields are reflected by surrounding conducting structures, i.e. cathode, cavity walls, and irises. Since a Green´s function by definition is generated by a Delta function source while satisfying an appropriate boundary conditions, i.e. a conducting boundaries, a Green´s function method can be effectively utilized for computing the space-fields in a photocathode source simulation. We demonstrate how these methods are used in a newly developed code called IRPSS (Indiana RF photocathode source simulator) and show initial simulations using IRPSS