Benchmark and comparisons of FEL simulation programs TDA3D and GENESIS.

A low-energy undulator test line (LEUTL) is under construction at the Advanced Photon Source (APS). This line will initially be used to demonstrate a free-electron laser (FEL) based on the self-amplified spontaneous-emission (SASE) process. The FEL simulation programs, TDA3D and GENESIS, together with several other codes have been used for the LEUTL project. In order to increase the confidence on the simulation results, we attempted to benchmark two programs TDA3D and GENESIS. The results are reported here.