### Abstract

Generalized conservation laws and gain-spread relations in the free-electron laser are derived for variable wiggler configurations. The derivation follows from the general equations of paper I in this series. It is suggested that bandwidth limitations on the optimization of the small-signal gain-to-spread ratio of a storage ring FEL might be overcome by transverse velocity filtering of the electrons.

Original language | English (US) |
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Pages (from-to) | 2009-2019 |

Number of pages | 11 |

Journal | Physical Review A |

Volume | 21 |

Issue number | 6 |

DOIs | |

State | Published - Jan 1 1980 |

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

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## Cite this

Bonifacio, R., Meystre, P., Moore, G. T., & Scully, M. O. (1980). Coherent dynamics of a free-electron laser with arbitrary magnet geometry. II. Conservation laws, small-signal theory, and gain-spread relations.

*Physical Review A*,*21*(6), 2009-2019. https://doi.org/10.1103/PhysRevA.21.2009