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Title: Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability

Abstract

Self-seeding is one of the most promising methods to improve the longitudinal coherence and spectral purity of free-electron lasers (FELs). Measurements of the multishot-averaged, soft x-ray self-seeding spectrum at the Linac Coherent Light Source (LCLS) FEL often have a pedestal-like distribution around the seeded wavelength. In this paper, a theoretical model based on the mechanism of spectral sideband generation is developed to explain the statistical behavior of the seed and pedestal. The model is in good agreement with statistical analysis of numerical FEL simulations and experimental measurements that show that pedestal fluctuations reflect the level of long-wavelength microbunching structures in the beam, and are driven by fluctuations of the seed.

Authors:
ORCiD logo; ; ORCiD logo; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1592808
Alternate Identifier(s):
OSTI ID: 1605013
Grant/Contract Number:  
AC02-76SF00515; 2017-SLAC-100382
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 23 Journal Issue: 1; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Free-electron lasers

Citation Formats

Zhang, Zhen, Marcus, Gabriel, Hemsing, Erik, Fawley, William M., Huang, Zhirong, and Lutman, Alberto. Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability. United States: N. p., 2020. Web. doi:10.1103/PhysRevAccelBeams.23.010704.
Zhang, Zhen, Marcus, Gabriel, Hemsing, Erik, Fawley, William M., Huang, Zhirong, & Lutman, Alberto. Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability. United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.23.010704
Zhang, Zhen, Marcus, Gabriel, Hemsing, Erik, Fawley, William M., Huang, Zhirong, and Lutman, Alberto. Wed . "Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability". United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.23.010704.
@article{osti_1592808,
title = {Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability},
author = {Zhang, Zhen and Marcus, Gabriel and Hemsing, Erik and Fawley, William M. and Huang, Zhirong and Lutman, Alberto},
abstractNote = {Self-seeding is one of the most promising methods to improve the longitudinal coherence and spectral purity of free-electron lasers (FELs). Measurements of the multishot-averaged, soft x-ray self-seeding spectrum at the Linac Coherent Light Source (LCLS) FEL often have a pedestal-like distribution around the seeded wavelength. In this paper, a theoretical model based on the mechanism of spectral sideband generation is developed to explain the statistical behavior of the seed and pedestal. The model is in good agreement with statistical analysis of numerical FEL simulations and experimental measurements that show that pedestal fluctuations reflect the level of long-wavelength microbunching structures in the beam, and are driven by fluctuations of the seed.},
doi = {10.1103/PhysRevAccelBeams.23.010704},
journal = {Physical Review Accelerators and Beams},
number = 1,
volume = 23,
place = {United States},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevAccelBeams.23.010704

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Cited by: 1 work
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