Laguerre-Gaussian and beamlet array as second generation laser heater profiles
Abstract
The microbunching instability is known to be detrimental to x-ray free electron laser performance. At the Linear Coherent Light Source, the microbunching instability is suppressed with a laser heater, which increases the uncorrelated energy spread of e-beam in the injector. While the current system has been shown to improve x-ray brightness, other laser architectures could further enhance performance. In this study, we model the interaction between a laser and e-beam with arbitrary transverse profiles and examine the effect of various laser designs on the energy distribution of the electrons after the injector and laser heater, as well as their ability to suppress microbunching instability. This simulation incorporates random transverse jitter in order to reproduce physically representative operation of the Linac Coherent Light Source. We compare Gaussian and Laguerre-Gaussian modes, and explore composite beams in the form of an array of Gaussian beamlets. We conclude that the Gaussian laser profile is highly susceptible to e-beam ellipticity and random transverse jitter. The Laguerre-Gaussian profile, a mathematically ideal solution to suppressing microbunching, is less susceptible to these effects and can provide effective suppression even with a distorted e-beam, though performance can be improved by increasing stabilization. The array of beamlets presents a solutionmore »
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)
- OSTI Identifier:
- 1469432
- Alternate Identifier(s):
- OSTI ID: 1475399
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 21 Journal Issue: 9; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Liebster, Nikolas, Tang, Jingyi, Ratner, Daniel, Liu, Wei, Vetter, Sharon, Huang, Zhirong, and Carbajo, Sergio. Laguerre-Gaussian and beamlet array as second generation laser heater profiles. United States: N. p., 2018.
Web. doi:10.1103/PhysRevAccelBeams.21.090701.
Liebster, Nikolas, Tang, Jingyi, Ratner, Daniel, Liu, Wei, Vetter, Sharon, Huang, Zhirong, & Carbajo, Sergio. Laguerre-Gaussian and beamlet array as second generation laser heater profiles. United States. https://doi.org/10.1103/PhysRevAccelBeams.21.090701
Liebster, Nikolas, Tang, Jingyi, Ratner, Daniel, Liu, Wei, Vetter, Sharon, Huang, Zhirong, and Carbajo, Sergio. Tue .
"Laguerre-Gaussian and beamlet array as second generation laser heater profiles". United States. https://doi.org/10.1103/PhysRevAccelBeams.21.090701.
@article{osti_1469432,
title = {Laguerre-Gaussian and beamlet array as second generation laser heater profiles},
author = {Liebster, Nikolas and Tang, Jingyi and Ratner, Daniel and Liu, Wei and Vetter, Sharon and Huang, Zhirong and Carbajo, Sergio},
abstractNote = {The microbunching instability is known to be detrimental to x-ray free electron laser performance. At the Linear Coherent Light Source, the microbunching instability is suppressed with a laser heater, which increases the uncorrelated energy spread of e-beam in the injector. While the current system has been shown to improve x-ray brightness, other laser architectures could further enhance performance. In this study, we model the interaction between a laser and e-beam with arbitrary transverse profiles and examine the effect of various laser designs on the energy distribution of the electrons after the injector and laser heater, as well as their ability to suppress microbunching instability. This simulation incorporates random transverse jitter in order to reproduce physically representative operation of the Linac Coherent Light Source. We compare Gaussian and Laguerre-Gaussian modes, and explore composite beams in the form of an array of Gaussian beamlets. We conclude that the Gaussian laser profile is highly susceptible to e-beam ellipticity and random transverse jitter. The Laguerre-Gaussian profile, a mathematically ideal solution to suppressing microbunching, is less susceptible to these effects and can provide effective suppression even with a distorted e-beam, though performance can be improved by increasing stabilization. The array of beamlets presents a solution that produces consistent and smooth energy distributions with significantly less variance in heating than the Laguerre-Gaussian profile.},
doi = {10.1103/PhysRevAccelBeams.21.090701},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 21,
place = {United States},
year = {Tue Sep 11 00:00:00 EDT 2018},
month = {Tue Sep 11 00:00:00 EDT 2018}
}
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https://doi.org/10.1103/PhysRevAccelBeams.21.090701
https://doi.org/10.1103/PhysRevAccelBeams.21.090701
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Cited by: 11 works
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Figures / Tables:
Table I: Relevant LCLS parameter values.
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.