FEL photoinjector simulation studies by combining MAFIA TS2 and ASTRA

For the successful FEL operation a high brightness low emittance beam is of crucial importance. For a detailed investigation of the emittance development the simulations should not be restricted to the rf-gun only. That is why the two simulation codes MAFIA TS2 and ASTRA have been combined in order to make use of their individual advantages. The PIC code MAFIA TS2 is used for detailed modelling of the space charge effects inside the rf-gun. By using a data interface the beam dynamics downstreams the rf-gun is simulated by ASTRA which is capable of simulating long accelerator structures efficiently. In this paper we discuss the advantages and limitations of both simulation approaches. Additionally the results of combined simulations using both codes are presented.