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Further Studies of Undulator Tapering in X-Ray FELs

Mak, Alan LU ; Curbis, Francesca LU and Werin, Sverker LU (2015) In Proceedings of FEL 2015, Daejeon, Korea p.321-321
Abstract
We further the studies of the model-based optimization of tapered free-electron lasers presented in a recent publication [Phys. Rev. ST Accel. Beams 18, 040702 (2015)]. Departing from the ideal case, wherein the taper profile is a smooth and continuous function, we consider the more realistic case, with individual undulator segments separated by break sections. Using the simulation code GENESIS, we apply our taper optimization method to a case, which closely resembles the FLASH2 facility in Hamburg, Germany. By comparing steady-state and time-dependent simulations, we examine how time-dependent effects alter the optimal taper scenario. From the simulation results, we also deduce that the "traditional" empirical method, whereby the... (More)
We further the studies of the model-based optimization of tapered free-electron lasers presented in a recent publication [Phys. Rev. ST Accel. Beams 18, 040702 (2015)]. Departing from the ideal case, wherein the taper profile is a smooth and continuous function, we consider the more realistic case, with individual undulator segments separated by break sections. Using the simulation code GENESIS, we apply our taper optimization method to a case, which closely resembles the FLASH2 facility in Hamburg, Germany. By comparing steady-state and time-dependent simulations, we examine how time-dependent effects alter the optimal taper scenario. From the simulation results, we also deduce that the "traditional" empirical method, whereby the intermediate radiation power is maximized after closing every undulator gap, does not necessarily produce the highest final power at the exit of the undulator line. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
undulator, simulation, electron, radiation, laser
in
Proceedings of FEL 2015, Daejeon, Korea
pages
326 pages
ISBN
978-3-95450-134-2
DOI
10.18429/JACoW-FEL2015-TUP002
language
English
LU publication?
yes
id
b0d272aa-410c-4b63-bf90-145ba9ed11ab
date added to LUP
2016-04-13 12:56:21
date last changed
2016-04-27 21:58:14
@inproceedings{b0d272aa-410c-4b63-bf90-145ba9ed11ab,
  abstract     = {We further the studies of the model-based optimization of tapered free-electron lasers presented in a recent publication [Phys. Rev. ST Accel. Beams 18, 040702 (2015)]. Departing from the ideal case, wherein the taper profile is a smooth and continuous function, we consider the more realistic case, with individual undulator segments separated by break sections. Using the simulation code GENESIS, we apply our taper optimization method to a case, which closely resembles the FLASH2 facility in Hamburg, Germany. By comparing steady-state and time-dependent simulations, we examine how time-dependent effects alter the optimal taper scenario. From the simulation results, we also deduce that the "traditional" empirical method, whereby the intermediate radiation power is maximized after closing every undulator gap, does not necessarily produce the highest final power at the exit of the undulator line.},
  author       = {Mak, Alan and Curbis, Francesca and Werin, Sverker},
  booktitle    = {Proceedings of FEL 2015, Daejeon, Korea},
  isbn         = {978-3-95450-134-2},
  keyword      = {undulator, simulation, electron, radiation, laser},
  language     = {eng},
  pages        = {321--321},
  title        = {Further Studies of Undulator Tapering in X-Ray FELs},
  url          = {http://dx.doi.org/10.18429/JACoW-FEL2015-TUP002},
  year         = {2015},
}