A new approach to improving the efficiency of fel oscillator simulations

摘要

During the last year we have been benchmarking FELoscillator simulation codes against the measuredperformance of the three Jefferson Lab oscillator FELs.While one might think that a full 4D simulation is defacto the best predictor of performance, the simulationsare computationally intensive, even when analyticalapproximations to the electron bunch longitudinaldistribution are used. In this presentation we compare thepredictions of the 4D FEL interaction codes Genesis andMedusa, in combination with the optical code OPC, withthose using a combination of the 2D & 3D versions ofthese codes, which can be run quickly on a single CPUcore desktop computer.