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

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 un...

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Main Authors:	Xiehe Zhong, Michael G. Kong
Format:	Default Article
Published:	2002
Subjects:	Mechanical engineering not elsewhere classified Free lectron lasers Harmonic generation Masers Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/5221
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id	rr-article-9568787
record_format	Figshare
spelling	rr-article-95687872002-01-01T00:00:00Z Nonlinear amplification in a second-harmonic waveguide free-electron laser Xiehe Zhong (7201370) Michael G. Kong (7128488) Mechanical engineering not elsewhere classified Free lectron lasers Harmonic generation Masers Mechanical Engineering not elsewhere classified 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. 2002-01-01T00:00:00Z Text Journal contribution 2134/5221 https://figshare.com/articles/journal_contribution/Nonlinear_amplification_in_a_second-harmonic_waveguide_free-electron_laser/9568787 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Free lectron lasers Harmonic generation Masers Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Free lectron lasers Harmonic generation Masers Mechanical Engineering not elsewhere classified Xiehe Zhong Michael G. Kong Nonlinear amplification in a second-harmonic waveguide free-electron laser
description	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.
format	Default Article
author	Xiehe Zhong Michael G. Kong
author_facet	Xiehe Zhong Michael G. Kong
author_sort	Xiehe Zhong (7201370)
title	Nonlinear amplification in a second-harmonic waveguide free-electron laser
title_short	Nonlinear amplification in a second-harmonic waveguide free-electron laser
title_full	Nonlinear amplification in a second-harmonic waveguide free-electron laser
title_fullStr	Nonlinear amplification in a second-harmonic waveguide free-electron laser
title_full_unstemmed	Nonlinear amplification in a second-harmonic waveguide free-electron laser
title_sort	nonlinear amplification in a second-harmonic waveguide free-electron laser
publishDate	2002
url	https://hdl.handle.net/2134/5221
_version_	1797287309387759616

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

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