Author: Gjonaj, E.
Paper Title Page
TUAAI1
 Numerical Modelling of RF Electron Sources for FEL-Accelerators  
 
  • E. Gjonaj
    TEMF, TU Darmstadt, Darmstadt, Germany
  
  Funding: Work supported by DESY, Hamburg
RF sources represent a key component for FEL radiation sources. The most important tool for their analysis is numerical simulation. However, the broad spectrum of phenomena involved, including space-charge interaction, retardation effects as well as cavity wakefields, make this type of simulations extremely demanding. Beam dynamics simulation codes are faced with the challenge of reproducing all these effects occurring at different temporal and spatial scales while using a possibly small amount of computational resources and simulation times. According to the physical assumptions employed, these codes may be categorized as
  1. space-charge codes in the boosted frame,
  2. codes based on the Lienard-Wiechert interaction of individual particles,
  3. Particle-In-Cell codes and
  4. wakefield codes. In this work, a comparative study of these simulation approaches will be presented.
Particular emphasis will be given to the influence of the physical assumptions used by each of these approaches on simulation accuracy. The numerical examples will refer in the first place to the PITZ-photoinjector which is presently being designed as the electron source for the European XFEL facility at DESY. 		 
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