Beam parameter simulation of the Rossendorfer SRF gun and comparison with other RF photo injectors

For each accelerator the choice of the injector is a crucial topic and the best gun concept for the different demands must be determined. This paper presents simulated data of beam parameters from the Rossendorfer SRF gun and other RF photo injectors. The differences between normal and superconducting guns lead to different possibilities in the operation modes. Due to the high RF power losses in normal conducting guns the duty cycle is low and cw-mode operation impossible. For the SRF gun an exterior magnetic field for emittance compensation close to the photo cathode is prohibited due to the Meißner-Ochsenfeld effect. Therefore, other mechanisms for emittance compensation must be used. In the simulations RF focusing with a proper cathode visor and a solenoid focusing after the gun are considered.