Electron beam dynamics simulations for the low emittance gun

In the scope of the LEG Project at PSI [1][2] a field emitter array (FEA) cathode is being considered as an electron source. We present simulation results for a gun test stand performed with the code MAFIA [3] as well as report on the novel parallel 3D PIC code ”Capone” which will allow realistic simulation of particle emission from FEA cathodes with the required sub-micron resolution.