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Nonlinear amplification in a second-harmonic waveguide free-electron laser

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journal contribution
posted on 26.08.2009 by Xiehe Zhong, Michael G. Kong
This paper describes the results of numerical simulation of second-harmonic waveguide free-electron lasers (FELs) from the small-signal regime to the large-signal regime. Aimed at reducing the size and hence the cost of compact waveguide FELs operated from the microwave to the far infrared, these unconventional waveguide FELs can substantially decrease the minimum electron energy required for strong FEL radiation at a given frequency while increasing the small-signal gain. This contribution focuses on their saturation behaviors, taking into consideration variation in wiggler field and electron-energy spread. Depending on the roundtrip power loss within the FEL cavity and the initial electron-energy spread, the computed relationship between interaction gain and in-cavity power can be used to maximize the output power at a given electron current. Furthermore, it is found that gain degradation due to electron-energy spread remains relatively unchanged regardless of radiation power and wiggler field.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

ZHONG, X. and KONG, M.G., 2002. Nonlinear amplification in a second-harmonic waveguide free-electron laser. IEEE Transactions on Plasma Science, 30(5), pt. 2, pp. 2059-2065.

Publisher

© IEEE

Version

VoR (Version of Record)

Publication date

2002

Notes

This article was published in the journal, IEEE Transactions on Plasma Science [© 2002 IEEE] and is also available at: http://ieeexplore.ieee.org/ Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

ISSN

0093-3813

Language

en

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