Comment on 'Chaotic electron trajectories in an electromagnetic wiggler free-electron laser with ion-channel guiding' [Phys. Plasmas 17, 093103 (2010)]

摘要

The chaotic electron dynamics in a free-electron laser with electromagnetic-wave wiggler and ion-channel has been recently reported by A. Taghavi et al. [Phys. Plasmas 17, 093103 (2010)]. We comment on the authors use of a set of initial condition that is not correct based on the dispersion relation and steady-state orbits.