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Mitigation of CSR induced spectral broadening in EEHG FEL

Pop, Mihai LU ; Curbis, Francesca LU orcid ; Werin, Sverker LU and Allaria, Enrico (2023) In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1048.
Abstract

Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled... (More)

Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled with the second dispersive section, this modulation creates a position dependent change in the final bunching wavelength. In this work we show that tailoring the second seed laser wavelength can successfully compensate for the varying energy profile induced by CSR.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CSR, EEHG, FEL, Laser tailoring, Optimization
in
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
volume
1048
article number
167926
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85144551092
ISSN
0168-9002
DOI
10.1016/j.nima.2022.167926
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 The Author(s)
id
0d891ded-196c-4dd4-a9d3-83538d701e4b
date added to LUP
2023-01-04 10:22:33
date last changed
2023-10-12 14:47:42
@article{0d891ded-196c-4dd4-a9d3-83538d701e4b,
  abstract     = {{<p>Externally seeded schemes have offered a major leap in improving the longitudinal coherence of FELs in the EUV and soft X-ray range. The Echo Enabled Harmonic Generation (EEHG) technique creates bunching at wavelengths of a few nanometers in two stages of longitudinal phase space manipulation, each consisting of an energy modulator and a chicane. Compared to other seeding techniques, EEHG is less sensitive to electron beam phase space distortions occurring during acceleration and compression. However the strong chicane needed in the first stage makes the system vulnerable to Coherent Synchrotron Radiation (CSR), which imprints a long-wavelength energy modulation on the electron bunch after the EEHG process has been initiated. Coupled with the second dispersive section, this modulation creates a position dependent change in the final bunching wavelength. In this work we show that tailoring the second seed laser wavelength can successfully compensate for the varying energy profile induced by CSR.</p>}},
  author       = {{Pop, Mihai and Curbis, Francesca and Werin, Sverker and Allaria, Enrico}},
  issn         = {{0168-9002}},
  keywords     = {{CSR; EEHG; FEL; Laser tailoring; Optimization}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}},
  title        = {{Mitigation of CSR induced spectral broadening in EEHG FEL}},
  url          = {{http://dx.doi.org/10.1016/j.nima.2022.167926}},
  doi          = {{10.1016/j.nima.2022.167926}},
  volume       = {{1048}},
  year         = {{2023}},
}