Microbunching-instability-induced sidebands in a seeded free-electron laser
Abstract
Measurements of the multishot-averaged, soft x-ray, self-seeding spectrum at the LCLS free-electron laser often have a pedestal-like distribution around the seeded wavelength, which limits the spectral purity and can negatively affect some user applications not employing a post-undulator monochromator. In this paper, we study the origins of such pedestals, focusing on longitudinal phase space modulations produced by the microbunching instability upstream of the free-electron laser (FEL) undulator. Furthermore, we show from theory and numerical simulation that both energy and density modulations can induce sidebands in a high-gain, seeded FEL whose fractional strength typically grows as the square of the undulator length. The results place a tight constraint on the longitudinal phase space uniformity of the electron beam for a seeded FEL, possibly requiring the amplitude of long-wavelength modulations to be much smaller than the typical incoherent energy spread if the output sideband power is to remain only a couple percent or less of the amplified seed power.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1250549
- Alternate Identifier(s):
- OSTI ID: 1240361
- Report Number(s):
- SLAC-PUB-16487
Journal ID: ISSN 2469-9888; PRABFM; 050701
- Grant/Contract Number:
- AC02-76SF00515; AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 5; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; ACCPHY, XFEL
Citation Formats
Zhang, Zhen, Lindberg, Ryan, Fawley, William M., Huang, Zhirong, Krzywinski, Jacek, Lutman, Alberto, Marcus, Gabriel, and Marinelli, Agostino. Microbunching-instability-induced sidebands in a seeded free-electron laser. United States: N. p., 2016.
Web. doi:10.1103/PhysRevAccelBeams.19.050701.
Zhang, Zhen, Lindberg, Ryan, Fawley, William M., Huang, Zhirong, Krzywinski, Jacek, Lutman, Alberto, Marcus, Gabriel, & Marinelli, Agostino. Microbunching-instability-induced sidebands in a seeded free-electron laser. United States. https://doi.org/10.1103/PhysRevAccelBeams.19.050701
Zhang, Zhen, Lindberg, Ryan, Fawley, William M., Huang, Zhirong, Krzywinski, Jacek, Lutman, Alberto, Marcus, Gabriel, and Marinelli, Agostino. Mon .
"Microbunching-instability-induced sidebands in a seeded free-electron laser". United States. https://doi.org/10.1103/PhysRevAccelBeams.19.050701.
@article{osti_1250549,
title = {Microbunching-instability-induced sidebands in a seeded free-electron laser},
author = {Zhang, Zhen and Lindberg, Ryan and Fawley, William M. and Huang, Zhirong and Krzywinski, Jacek and Lutman, Alberto and Marcus, Gabriel and Marinelli, Agostino},
abstractNote = {Measurements of the multishot-averaged, soft x-ray, self-seeding spectrum at the LCLS free-electron laser often have a pedestal-like distribution around the seeded wavelength, which limits the spectral purity and can negatively affect some user applications not employing a post-undulator monochromator. In this paper, we study the origins of such pedestals, focusing on longitudinal phase space modulations produced by the microbunching instability upstream of the free-electron laser (FEL) undulator. Furthermore, we show from theory and numerical simulation that both energy and density modulations can induce sidebands in a high-gain, seeded FEL whose fractional strength typically grows as the square of the undulator length. The results place a tight constraint on the longitudinal phase space uniformity of the electron beam for a seeded FEL, possibly requiring the amplitude of long-wavelength modulations to be much smaller than the typical incoherent energy spread if the output sideband power is to remain only a couple percent or less of the amplified seed power.},
doi = {10.1103/PhysRevAccelBeams.19.050701},
journal = {Physical Review Accelerators and Beams},
number = 5,
volume = 19,
place = {United States},
year = {Mon May 02 00:00:00 EDT 2016},
month = {Mon May 02 00:00:00 EDT 2016}
}
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https://doi.org/10.1103/PhysRevAccelBeams.19.050701
https://doi.org/10.1103/PhysRevAccelBeams.19.050701
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Cited by: 6 works
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