Abstract
Zhang and Elgin [Phys. Plasmas 11, 1663 (2004)] studied the dynamical stability of electron trajectories in a free-electron laser (FEL). We have shown that their trajectories are not confined and diverge when self-fields are included or when the adiabatic wiggler magnetic field is removed. Therefore, their results are not relevant to FELs and to the experiment on which their study is based upon.
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