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Single-Shot Reconstruction of Electron Beam Longitudinal Phase Space in a Laser Wakefield Accelerator

Mayong, Y. ; Streeter, M. J.V. ; Albert, F. ; Bourgeois, N. ; Cipiccia, S. ; Cole, J. M. ; Dann, S. J.D. ; Falk, K. ; Gerstmayr, E. and Gallardo González, I. LU orcid , et al. (2025) In Physical Review X 15(3).
Abstract

We report on a single-shot longitudinal phase-space reconstruction diagnostic for electron beams in a laser wakefield accelerator via the experimental observation of distinct periodic modulations in the angularly resolved spectra. Such modulated angular spectra arise as a result of the direct interaction between the ultrarelativistic electron beam and the laser driver in the presence of the wakefield. A constrained theoretical model for the coupled oscillator, assisted by a genetic algorithm, can recreate the experimental electron spectra and, thus, fully reconstructs the longitudinal phase-space distribution of the electron beam with a temporal resolution of approximately 1.3 fs. In particular, it reveals the slice energy spread of the... (More)

We report on a single-shot longitudinal phase-space reconstruction diagnostic for electron beams in a laser wakefield accelerator via the experimental observation of distinct periodic modulations in the angularly resolved spectra. Such modulated angular spectra arise as a result of the direct interaction between the ultrarelativistic electron beam and the laser driver in the presence of the wakefield. A constrained theoretical model for the coupled oscillator, assisted by a genetic algorithm, can recreate the experimental electron spectra and, thus, fully reconstructs the longitudinal phase-space distribution of the electron beam with a temporal resolution of approximately 1.3 fs. In particular, it reveals the slice energy spread of the electron beam, which is important to measure for applications such as x-ray free electron lasers. In our experiment, the root-mean-square slice energy spread retrieved is bounded at 9.9 MeV, corresponding to a 0.9%–3.0% relative spread, despite the overall GeV energy beam having approximately 100% relative energy spread.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review X
volume
15
issue
3
article number
031062
publisher
American Physical Society
external identifiers
  • scopus:105023162339
ISSN
2160-3308
DOI
10.1103/sxqf-l6mp
language
English
LU publication?
yes
id
6d1cbc41-10d4-4434-941f-e1d01dab5c34
date added to LUP
2026-02-03 14:40:58
date last changed
2026-02-03 14:42:14
@article{6d1cbc41-10d4-4434-941f-e1d01dab5c34,
  abstract     = {{<p>We report on a single-shot longitudinal phase-space reconstruction diagnostic for electron beams in a laser wakefield accelerator via the experimental observation of distinct periodic modulations in the angularly resolved spectra. Such modulated angular spectra arise as a result of the direct interaction between the ultrarelativistic electron beam and the laser driver in the presence of the wakefield. A constrained theoretical model for the coupled oscillator, assisted by a genetic algorithm, can recreate the experimental electron spectra and, thus, fully reconstructs the longitudinal phase-space distribution of the electron beam with a temporal resolution of approximately 1.3 fs. In particular, it reveals the slice energy spread of the electron beam, which is important to measure for applications such as x-ray free electron lasers. In our experiment, the root-mean-square slice energy spread retrieved is bounded at 9.9 MeV, corresponding to a 0.9%–3.0% relative spread, despite the overall GeV energy beam having approximately 100% relative energy spread.</p>}},
  author       = {{Mayong, Y. and Streeter, M. J.V. and Albert, F. and Bourgeois, N. and Cipiccia, S. and Cole, J. M. and Dann, S. J.D. and Falk, K. and Gerstmayr, E. and Gallardo González, I. and Higginbotham, A. and Hussein, A. E. and Jaroszynski, D. A. and Joglekar, A. S. and Kettle, B. and Krushelnick, K. and Lemos, N. and Lopes, N. C. and Lumsden, C. and Lundh, O. and Mangles, S. P.D. and Miller, K. G. and Mori, W. and Najmudin, Z. and Qian, Q. and Rajeev, P. P. and Seipt, D. and Shahzad, M. and Šmíd, M. and Spesyvtsev, R. and Symes, D. R. and Vieux, G. and Willingale, L. and Wood, J. C. and Thomas, A. G.R.}},
  issn         = {{2160-3308}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review X}},
  title        = {{Single-Shot Reconstruction of Electron Beam Longitudinal Phase Space in a Laser Wakefield Accelerator}},
  url          = {{http://dx.doi.org/10.1103/sxqf-l6mp}},
  doi          = {{10.1103/sxqf-l6mp}},
  volume       = {{15}},
  year         = {{2025}},
}