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Model-Based Optimization of Tapered Free-Electron Lasers

Mak, Alan LU ; Curbis, Francesca LU and Werin, Sverker LU (2015) In Physical Review Special Topics - Accelerators and Beams 18(4).
Abstract
The energy extraction efficiency is a figure of merit for a free-electron laser (FEL). It can be enhanced by the technique of undulator tapering, which enables the sustained growth of radiation power beyond the initial saturation point. In the development of a single-pass x-ray FEL, it is important to exploit the full potential of this technique and optimize the taper profile aw(z). Our approach to the optimization is based on the theoretical model by Kroll, Morton, and Rosenbluth, whereby the taper profile aw(z) is not a predetermined function (such as linear or exponential) but is determined by the physics of a resonant particle. For further enhancement of the energy extraction efficiency, we propose a modification to the model, which... (More)
The energy extraction efficiency is a figure of merit for a free-electron laser (FEL). It can be enhanced by the technique of undulator tapering, which enables the sustained growth of radiation power beyond the initial saturation point. In the development of a single-pass x-ray FEL, it is important to exploit the full potential of this technique and optimize the taper profile aw(z). Our approach to the optimization is based on the theoretical model by Kroll, Morton, and Rosenbluth, whereby the taper profile aw(z) is not a predetermined function (such as linear or exponential) but is determined by the physics of a resonant particle. For further enhancement of the energy extraction efficiency, we propose a modification to the model, which involves manipulations of the resonant particle’s phase. Using the numerical simulation code GENESIS, we apply our model-based optimization methods to a case of the future FEL at the MAX IV Laboratory (Lund, Sweden), as well as a case of the LCLS-II facility (Stanford, USA). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Special Topics - Accelerators and Beams
volume
18
issue
4
publisher
American Physical Society
external identifiers
  • wos:000353330400001
  • scopus:84929376713
ISSN
1098-4402
DOI
10.1103/PhysRevSTAB.18.040702
language
English
LU publication?
yes
id
45be4cdc-1478-4d62-b284-ccfd29a53dbf (old id 5323062)
alternative location
http://journals.aps.org/prstab/abstract/10.1103/PhysRevSTAB.18.040702
date added to LUP
2015-04-28 19:49:47
date last changed
2017-07-30 04:19:45
@article{45be4cdc-1478-4d62-b284-ccfd29a53dbf,
  abstract     = {The energy extraction efficiency is a figure of merit for a free-electron laser (FEL). It can be enhanced by the technique of undulator tapering, which enables the sustained growth of radiation power beyond the initial saturation point. In the development of a single-pass x-ray FEL, it is important to exploit the full potential of this technique and optimize the taper profile aw(z). Our approach to the optimization is based on the theoretical model by Kroll, Morton, and Rosenbluth, whereby the taper profile aw(z) is not a predetermined function (such as linear or exponential) but is determined by the physics of a resonant particle. For further enhancement of the energy extraction efficiency, we propose a modification to the model, which involves manipulations of the resonant particle’s phase. Using the numerical simulation code GENESIS, we apply our model-based optimization methods to a case of the future FEL at the MAX IV Laboratory (Lund, Sweden), as well as a case of the LCLS-II facility (Stanford, USA).},
  articleno    = {040702},
  author       = {Mak, Alan and Curbis, Francesca and Werin, Sverker},
  issn         = {1098-4402},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review Special Topics - Accelerators and Beams},
  title        = {Model-Based Optimization of Tapered Free-Electron Lasers},
  url          = {http://dx.doi.org/10.1103/PhysRevSTAB.18.040702},
  volume       = {18},
  year         = {2015},
}