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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
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
0950-0340
Shayeganrad, Gholamreza
8ea55a9a-4fe2-49df-a0f4-55fa81596dab
Shayeganrad, Gholamreza
8ea55a9a-4fe2-49df-a0f4-55fa81596dab

Shayeganrad, Gholamreza (2019) 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. (doi:10.1080/09500340.2019.1629658).

Record type: Article

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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More information

Accepted/In Press date: 30 May 2019
e-pub ahead of print date: 19 June 2019
Keywords: coherent harmonic generation, electron bunch dynamics, intensity fluctuation, spectral fluctuation, Storage ring, temporal coherence

Identifiers

Local EPrints ID: 434693
URI: https://eprints.soton.ac.uk/id/eprint/434693
ISSN: 0950-0340
PURE UUID: 764efd65-6e4f-4645-9787-032189ac3e11

Catalogue record

Date deposited: 04 Oct 2019 16:30
Last modified: 04 Oct 2019 16:30

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