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Tailoring of the longitudinal phase space for improved Free-Electron Laser performance

Pirani, Saeid LU ; Curbis, Francesca LU orcid ; Pop, Mihai LU and Werin, Sverker LU (2023) In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1057.
Abstract

Free-electron lasers are capable of producing high-quality radiation in a wide wavelength range and at very high power and brilliance. To reach improved performance especially regarding coherence, bandwidth and wavelength stability, different seeding techniques are often required. However, a successful implementation of seeding typically demands a very high-quality electron beam, in terms of energy distribution and emittance. Techniques like Echo-Enabled Harmonic Generation (EEHG) and High-Brightness SASE (HB-SASE) require, or are significantly enhanced, by a flat distribution of particles in the longitudinal phase space. In this paper we describe how the initially chirped longitudinal phase space in the proposed Soft X-ray Laser (SXL)... (More)

Free-electron lasers are capable of producing high-quality radiation in a wide wavelength range and at very high power and brilliance. To reach improved performance especially regarding coherence, bandwidth and wavelength stability, different seeding techniques are often required. However, a successful implementation of seeding typically demands a very high-quality electron beam, in terms of energy distribution and emittance. Techniques like Echo-Enabled Harmonic Generation (EEHG) and High-Brightness SASE (HB-SASE) require, or are significantly enhanced, by a flat distribution of particles in the longitudinal phase space. In this paper we describe how the initially chirped longitudinal phase space in the proposed Soft X-ray Laser (SXL) at the MAX IV laboratory can be tailored by first overcompressing and then de-chirping the electron pulse. We also show that it is possible to retain the properties of the electron bunch and how such an enhanced distribution can drive HB-SASE “seeding”, resulting in a significantly reduced bandwidth and a better wavelength stability.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
De-chirper, Free-Electron Laser, Longitudinal phase space, Overcompression
in
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
volume
1057
article number
168696
publisher
Elsevier
external identifiers
  • scopus:85172468927
ISSN
0168-9002
DOI
10.1016/j.nima.2023.168696
language
English
LU publication?
yes
id
5b6aa40d-825a-41fa-a216-776fa40bef9e
date added to LUP
2023-10-27 11:48:24
date last changed
2024-04-04 11:26:50
@article{5b6aa40d-825a-41fa-a216-776fa40bef9e,
  abstract     = {{<p>Free-electron lasers are capable of producing high-quality radiation in a wide wavelength range and at very high power and brilliance. To reach improved performance especially regarding coherence, bandwidth and wavelength stability, different seeding techniques are often required. However, a successful implementation of seeding typically demands a very high-quality electron beam, in terms of energy distribution and emittance. Techniques like Echo-Enabled Harmonic Generation (EEHG) and High-Brightness SASE (HB-SASE) require, or are significantly enhanced, by a flat distribution of particles in the longitudinal phase space. In this paper we describe how the initially chirped longitudinal phase space in the proposed Soft X-ray Laser (SXL) at the MAX IV laboratory can be tailored by first overcompressing and then de-chirping the electron pulse. We also show that it is possible to retain the properties of the electron bunch and how such an enhanced distribution can drive HB-SASE “seeding”, resulting in a significantly reduced bandwidth and a better wavelength stability.</p>}},
  author       = {{Pirani, Saeid and Curbis, Francesca and Pop, Mihai and Werin, Sverker}},
  issn         = {{0168-9002}},
  keywords     = {{De-chirper; Free-Electron Laser; Longitudinal phase space; Overcompression}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}},
  title        = {{Tailoring of the longitudinal phase space for improved Free-Electron Laser performance}},
  url          = {{http://dx.doi.org/10.1016/j.nima.2023.168696}},
  doi          = {{10.1016/j.nima.2023.168696}},
  volume       = {{1057}},
  year         = {{2023}},
}