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

Zhang, Zhen; Marcus, Gabriel; Hemsing, Erik; Fawley, William M.; Huang, Zhirong; Lutman, Alberto

doi:10.1103/PhysRevAccelBeams.23.010704

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

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.010704· OSTI ID:1592808

; Marcus, Gabriel;

; Fawley, William M.; Huang, Zhirong; Lutman, Alberto

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; 2017-SLAC-100382

OSTI ID:: 1592808

Alternate ID(s):: OSTI ID: 1605013

Journal Information:: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 23 Journal Issue: 1; ISSN 2469-9888

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (22)

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

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