Study on the shot-to-shot fluctuation of intensity and spectra of femtosecond pulses in seeded low-gain free-electron laser at DELTA
Study on the shot-to-shot fluctuation of intensity and spectra of femtosecond pulses in seeded low-gain free-electron laser at DELTA
This paper reports an experimental study of the shot-to-shot intensity and spectral distribution fluctuations in the femtosecond coherent pulses from the storage ring (SR) based seeded free electron laser (FEL) at DELTA. A unique implementation of a gated ICCD camera coupled to a Czerny-Turner monochromator is utilized to reveal the details of the individual spectra and intensity of femtosecond pulses accompanied by a significant synchrotron background. This technique demonstrates the potential to study the dynamics of the electron bunches in an SR by scanning over a single electron bunch with seeded femtosecond laser pulses at a subharmonic repetition rate. To the best of our knowledge, this picture provides the first direct experimental evaluation of shot-to-shot intensity and spectral fluctuation in seeded SR-based FELs.
coherent harmonic generation, electron bunch dynamics, intensity fluctuation, spectral fluctuation, Storage ring, temporal coherence
81-91
Shayeganrad, Gholamreza
8ea55a9a-4fe2-49df-a0f4-55fa81596dab
2020
Shayeganrad, Gholamreza
8ea55a9a-4fe2-49df-a0f4-55fa81596dab
Shayeganrad, Gholamreza
(2020)
Study on the shot-to-shot fluctuation of intensity and spectra of femtosecond pulses in seeded low-gain free-electron laser at DELTA.
Journal of Modern Optics, 67 (2), .
(doi:10.1080/09500340.2019.1629658).
Abstract
This paper reports an experimental study of the shot-to-shot intensity and spectral distribution fluctuations in the femtosecond coherent pulses from the storage ring (SR) based seeded free electron laser (FEL) at DELTA. A unique implementation of a gated ICCD camera coupled to a Czerny-Turner monochromator is utilized to reveal the details of the individual spectra and intensity of femtosecond pulses accompanied by a significant synchrotron background. This technique demonstrates the potential to study the dynamics of the electron bunches in an SR by scanning over a single electron bunch with seeded femtosecond laser pulses at a subharmonic repetition rate. To the best of our knowledge, this picture provides the first direct experimental evaluation of shot-to-shot intensity and spectral fluctuation in seeded SR-based FELs.
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Accepted/In Press date: 30 May 2019
e-pub ahead of print date: 19 June 2019
Published date: 2020
Additional Information:
Funding Information:
Valuable contributions to this paper were received from colleagues at the DELTA and the Faculty of Physics for their continuous support. The author is very much indebted to all colleagues and engineers for operating machine and facilitating the experiment.
Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
Keywords:
coherent harmonic generation, electron bunch dynamics, intensity fluctuation, spectral fluctuation, Storage ring, temporal coherence
Identifiers
Local EPrints ID: 434693
URI: http://eprints.soton.ac.uk/id/eprint/434693
ISSN: 0950-0340
PURE UUID: 764efd65-6e4f-4645-9787-032189ac3e11
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Date deposited: 04 Oct 2019 16:30
Last modified: 16 Mar 2024 04:38
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Author:
Gholamreza Shayeganrad
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