Virtual dielectric waveguide mode description of a high-gain free-electron laser. II. Modeling and numerical simulations

Erik Hemsing*, Avraham Gover, James Rosenzweig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A high-gain free-electron laser is modeled using an expansion of the radiation field in terms of guided Laguerre-Gaussian modes of a virtual dielectric waveguide. The radiation profile evolution, power gain, and detuning efficiency characteristics are investigated for seeding with fundamental Gaussian and higher-order Laguerre-Gaussian input modes on a Gaussian e -beam in the collective regime. The full wave evolution solution at different seed radiation injection conditions results in determination of the optimal waist size and waist position of the seed radiation beam for maximum power coupling efficiency. Results for guided mode evolution and power gain are shown to be consistent with simulations performed with the code GENESIS 1.3. The amplification and spontaneous generation of FEL radiation with orbital angular momentum is also considered.

Original languageEnglish
Article number063831
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume77
Issue number6
DOIs
StatePublished - 20 Jun 2008

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