Correlated Energy-Spread Removal with Space Charge for High-Harmonic Generation

Hemsing, E.; Marinelli, Agostino; Marcus, Gabriel; Xiang, Dao

doi:10.1103/physrevlett.113.134802

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…Seeded FELs require high microbunch peak currents and that is why, as in [18], we reach a different conclusion from the microbunch compression with energy spread reduction theory presented in [49] which did not include CSR, 3D LSC, or 3D FEL physics in a treatment of a 5 kA soft X-ray FEL.…”

Section: Figcontrasting

confidence: 66%

Measurements and simulations of seeded electron microbunches with collective effects

Hacker

Molo

Khan

et al. 2015

Phys. Rev. ST Accel. Beams

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Measurements of the longitudinal phase-space distributions of electron bunches seeded with an external laser were done in order to study the impact of collective effects on seeded microbunches in free-electron lasers. When the collective effects of Coulomb forces in a drift space and coherent synchrotron radiation in a chicane are considered, velocity bunching of a seeded microbunch appears to be a viable alternative to compression with a magnetic chicane under high-gain harmonic generation seeding conditions. Measurements of these effects on seeded electron microbunches were performed with a rf deflecting structure and a dipole magnet which streak out the electron bunch for single-shot images of the longitudinal phase-space distribution. Particle tracking simulations in 3D predicted the compression dynamics of the seeded microbunches with collective effects.

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Section: Figcontrasting

confidence: 66%

Measurements and simulations of seeded electron microbunches with collective effects

Hacker

Molo

Khan

et al. 2015

Phys. Rev. ST Accel. Beams

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“…The price is an increased energy spread [81]. To overcome the limit on the maximum harmonic achievable, many solutions have been proposed since the early 90s [83,[86][87][88][89][90]. One of these is represented by the 'fresh bunch' multistage cascade approach [83,86].…”

Section: Euv and Soft X-ray Felsmentioning

confidence: 99%

Ultrafast magnetodynamics with free-electron lasers

Malvestuto

Ciprian

Caretta

et al. 2018

J. Phys.: Condens. Matter

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The study of ultrafast magnetodynamics has entered a new era thanks to the groundbreaking technological advances in free-electron laser (FEL) light sources. The advent of these light sources has made possible unprecedented experimental schemes for time-resolved x-ray magneto-optic spectroscopies, which are now paving the road for exploring the ultimate limits of out-of-equilibrium magnetic phenomena. In particular, these studies will provide insights into elementary mechanisms governing spin and orbital dynamics, therefore contributing to the development of ultrafast devices for relevant magnetic technologies. This topical review focuses on recent advancement in the study of non-equilibrium magnetic phenomena from the perspective of time-resolved extreme ultra violet (EUV) and soft x-ray spectroscopies at FELs with highlights of some important experimental results.

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“…Another factor that can influence the phase of the plasma oscillation is the bunch compression process. As demonstrated below, 2D Fourier analysis of the longitudinal phase space is able to reveal this phase, the control and application of which has applications to both FELs 16,43 and novel wakefield-based accelerators 44,45 .…”

mentioning

confidence: 99%

Characterisation of microbunching instability with 2D Fourier analysis

Brynes

Akkermans

Allaria

et al. 2020

Sci Rep

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The optimal performance of high-brightness free-electron lasers (FELs) is limited by the microbunching instability, which can cause variations in both the slice energy spread and longitudinal profile of electron beams. In this paper, we perform 2D Fourier analysis of the full bunch longitudinal phase space, such that modulations in both planes can be studied simultaneously. Unlike the standard 1D analysis, this method is able to reveal modulations in a folded phase space, which would otherwise remain uncovered. Additionally, the plasma oscillation between energy and density modulations is also revealed by this method. The damping of the microbunching instability, through the use of a laser heater, is also analysed with this technique. We confirm a mitigation of the amplitude of modulation and a red-shift of the microbunching frequency as the energy spread added increases. As an outcome of this work, a systematic experimental comparison of the development of the instability in the presence of different compression schemes is here presented for the first time.

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Correlated Energy-Spread Removal with Space Charge for High-Harmonic Generation

Cited by 10 publications

References 27 publications

Measurements and simulations of seeded electron microbunches with collective effects

Measurements and simulations of seeded electron microbunches with collective effects

Ultrafast magnetodynamics with free-electron lasers

Characterisation of microbunching instability with 2D Fourier analysis

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