Terawatt x-ray free-electron-laser optimization by transverse electron distribution shaping
Abstract
We study the dependence of the peak power of a 1.5 Å Terawatt (TW), tapered x-ray free-electron laser (FEL) on the transverse electron density distribution. Multidimensional optimization schemes for TW hard x-ray free-electron lasers are applied to the cases of transversely uniform and parabolic electron beam distributions and compared to a Gaussian distribution. The optimizations are performed for a 200 m undulator and a resonant wavelength of λr = 1.5 Å using the fully three-dimensional FEL particle code GENESIS. The study shows that the flatter transverse electron distributions enhance optical guiding in the tapered section of the undulator and increase the maximum radiation power from a maximum of 1.56 TW for a transversely Gaussian beam to 2.26 TW for the parabolic case and 2.63 TW for the uniform case. Spectral data also shows a 30%–70% reduction in energy deposited in the sidebands for the uniform and parabolic beams compared with a Gaussian. An analysis of the transverse coherence of the radiation shows the coherence area to be much larger than the beam spotsize for all three distributions, making coherent diffraction imaging experiments possible.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1180310
- Alternate Identifier(s):
- OSTI ID: 1213218
- Grant/Contract Number:
- SC0009983
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Special Topics. Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Special Topics. Accelerators and Beams Journal Volume: 17 Journal Issue: 11; Journal ID: ISSN 1098-4402
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Emma, C., Wu, J., Fang, K., Chen, S., Serkez, S., and Pellegrini, C. Terawatt x-ray free-electron-laser optimization by transverse electron distribution shaping. United States: N. p., 2014.
Web. doi:10.1103/PhysRevSTAB.17.110701.
Emma, C., Wu, J., Fang, K., Chen, S., Serkez, S., & Pellegrini, C. Terawatt x-ray free-electron-laser optimization by transverse electron distribution shaping. United States. https://doi.org/10.1103/PhysRevSTAB.17.110701
Emma, C., Wu, J., Fang, K., Chen, S., Serkez, S., and Pellegrini, C. Mon .
"Terawatt x-ray free-electron-laser optimization by transverse electron distribution shaping". United States. https://doi.org/10.1103/PhysRevSTAB.17.110701.
@article{osti_1180310,
title = {Terawatt x-ray free-electron-laser optimization by transverse electron distribution shaping},
author = {Emma, C. and Wu, J. and Fang, K. and Chen, S. and Serkez, S. and Pellegrini, C.},
abstractNote = {We study the dependence of the peak power of a 1.5 Å Terawatt (TW), tapered x-ray free-electron laser (FEL) on the transverse electron density distribution. Multidimensional optimization schemes for TW hard x-ray free-electron lasers are applied to the cases of transversely uniform and parabolic electron beam distributions and compared to a Gaussian distribution. The optimizations are performed for a 200 m undulator and a resonant wavelength of λr = 1.5 Å using the fully three-dimensional FEL particle code GENESIS. The study shows that the flatter transverse electron distributions enhance optical guiding in the tapered section of the undulator and increase the maximum radiation power from a maximum of 1.56 TW for a transversely Gaussian beam to 2.26 TW for the parabolic case and 2.63 TW for the uniform case. Spectral data also shows a 30%–70% reduction in energy deposited in the sidebands for the uniform and parabolic beams compared with a Gaussian. An analysis of the transverse coherence of the radiation shows the coherence area to be much larger than the beam spotsize for all three distributions, making coherent diffraction imaging experiments possible.},
doi = {10.1103/PhysRevSTAB.17.110701},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 11,
volume = 17,
place = {United States},
year = {Mon Nov 03 00:00:00 EST 2014},
month = {Mon Nov 03 00:00:00 EST 2014}
}
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https://doi.org/10.1103/PhysRevSTAB.17.110701
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