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Title: Interplay of the Chirps and Chirped Pulse Compression in a High-gain Seeded Free-electron Laser

Abstract

In a seeded high-gain Free-electron Laser (FEL), where a coherent laser pulse interacts with an ultra-relativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above mentioned two chirps are absent. In this paper we examine the interplay of these three chirps. The problem is formulated as an initial value problem, and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that in order to get a short pulse duration, an energy chirp in the electron beam is necessary.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
896942
Report Number(s):
SLAC-PUB-11985
TRN: US200705%%16
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE J.Quant.Electron.
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COMPRESSION; ELECTRON BEAMS; FREE ELECTRON LASERS; GREEN FUNCTION; PULSE TECHNIQUES; INTERACTIONS; Other,ACCPHY, OPTICS, SYNCHRAD, XFEL

Citation Formats

Wu, Juhao, /SLAC, Murphy, J.B., /LBNL, ALS, Emma, P.J., /SLAC, Wang, X.J., Watanabe, T., /LBNL, ALS, Zhong, Xinming, and /Beijing Normal U. Interplay of the Chirps and Chirped Pulse Compression in a High-gain Seeded Free-electron Laser. United States: N. p., 2007. Web. doi:10.1364/JOSAB.24.000484.
Wu, Juhao, /SLAC, Murphy, J.B., /LBNL, ALS, Emma, P.J., /SLAC, Wang, X.J., Watanabe, T., /LBNL, ALS, Zhong, Xinming, & /Beijing Normal U. Interplay of the Chirps and Chirped Pulse Compression in a High-gain Seeded Free-electron Laser. United States. doi:10.1364/JOSAB.24.000484.
Wu, Juhao, /SLAC, Murphy, J.B., /LBNL, ALS, Emma, P.J., /SLAC, Wang, X.J., Watanabe, T., /LBNL, ALS, Zhong, Xinming, and /Beijing Normal U. Wed . "Interplay of the Chirps and Chirped Pulse Compression in a High-gain Seeded Free-electron Laser". United States. doi:10.1364/JOSAB.24.000484. https://www.osti.gov/servlets/purl/896942.
@article{osti_896942,
title = {Interplay of the Chirps and Chirped Pulse Compression in a High-gain Seeded Free-electron Laser},
author = {Wu, Juhao and /SLAC and Murphy, J.B. and /LBNL, ALS and Emma, P.J. and /SLAC and Wang, X.J. and Watanabe, T. and /LBNL, ALS and Zhong, Xinming and /Beijing Normal U.},
abstractNote = {In a seeded high-gain Free-electron Laser (FEL), where a coherent laser pulse interacts with an ultra-relativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above mentioned two chirps are absent. In this paper we examine the interplay of these three chirps. The problem is formulated as an initial value problem, and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that in order to get a short pulse duration, an energy chirp in the electron beam is necessary.},
doi = {10.1364/JOSAB.24.000484},
journal = {IEEE J.Quant.Electron.},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 03 00:00:00 EST 2007},
month = {Wed Jan 03 00:00:00 EST 2007}
}