Simulation of electron gun and superconducting accelerating structures at self amplifications of spontaneous emission laser systems

In this thesis, the study has been done on the production of electron beam that is used at Self amplification spotaneous emission free electron laser. The first thing is to satisfy for the electron gun which is based on RF photocathode, the extraction of the electron beam from the photocathode by using Nd:YLF laser and then accelerate the first beam. Obtaining electrons and to accelerate them, it is utilized various simulation programs. Behaviour of the Electric field of accelerating cavities is modelled by Superfish and Poisson Code is used in order to simulate main solenoid that is supplied magnetic field for gun. For the electrons that is extracting from semiconducting photocathode in the electron, beam behaviour along the beamline and phase space is studied and modelled by Astra Simulation Program. As a result of this study, resultant electrons from gun have 1.8 MeV energy while after first accelerating cavities, the energy raise to 12.8 MeV, thus efficiency of the eccelerating cavities is seen clearly by simulation studies. On the other hand, Transverse and longitudinal emittance, beam divergence, beam size of the extracting electron beam from the cathode can be obtained in a good agreement with the similar laser laboratories in the World.