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Title: 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. https://doi.org/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 = {2016},
month = {5}
}

Journal Article:
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Cited by: 1 work
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Works referenced in this record:

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Comparative study of nonideal beam effects in high gain harmonic generation and self-seeded free electron lasers
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Klystron instability of a relativistic electron beam in a bunch compressor
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Suppression of microbunching instability in the linac coherent light source
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  • Physical Review Special Topics - Accelerators and Beams, Vol. 7, Issue 7
  • DOI: 10.1103/PhysRevSTAB.7.074401

Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source
journal, March 2015


Multicolor High-Gain Free-Electron Laser Driven by Seeded Microbunching Instability
journal, November 2015


Stimulated emission from relativistic electrons passing through a spatially periodic transverse magnetic field
journal, January 1978


GENESIS 1.3: a fully 3D time-dependent FEL simulation code
journal, June 1999

  • Reiche, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 429, Issue 1-3
  • DOI: 10.1016/S0168-9002(99)00114-X

Transform-Limited X-Ray Pulse Generation from a High-Brightness Self-Amplified Spontaneous-Emission Free-Electron Laser
journal, March 2013


Purified self-amplified spontaneous emission free-electron lasers with slippage-boosted filtering
journal, January 2013

  • Xiang, Dao; Ding, Yuantao; Huang, Zhirong
  • Physical Review Special Topics - Accelerators and Beams, Vol. 16, Issue 1
  • DOI: 10.1103/PhysRevSTAB.16.010703

    Works referencing / citing this record:

    Laguerre-Gaussian and beamlet array as second generation laser heater profiles
    journal, September 2018


    Generation of high-power, tunable terahertz radiation from laser interaction with a relativistic electron beam
    journal, May 2017


    Experimental observations of seed growth and accompanying pedestal contamination in a self-seeded, soft x-ray free-electron laser
    journal, August 2019


    Statistical analysis of a self-seeded x-ray free-electron laser in the presence of the microbunching instability
    journal, January 2020