Intrabeam scattering in high brightness electron linacs

Mitri, S. Di

doi:10.1103/physrevstab.17.074401

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…It has been estimated that an EEHG energy band will spread out as a function of distance and focusing [33,34], in terms of peak current, I, emittance, ε x , and beam radius σ x . The Coulomb logarithm is estimated to be 8.…”

Section: Implications Of Intra Beam Scatteringmentioning

confidence: 99%

longitudinal space charge assisted echo seeding of a free electron laser

Hacker

2015

SPIE Proceedings

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Seed lasers are employed to improve the temporal coherence of free-electron laser light. However, when seed pulses are short relative to the particle bunch, the noisy, temporally incoherent radiation from the un-seeded electrons can overwhelm the coherent, seeded radiation. In this paper a new seeding mechanism to improve the contrast between coherent and incoherent free electron laser radiation is employed together with a novel, simplified echo-seeding method. The concept relies on a combination of longitudinal space charge wakes and an echo-seeding technique to make a short, coherent pulse of FEL light together with noise background suppression. Several different simulation codes are used to illustrate the concept with conditions at the soft x-ray Free-electron LASer in Hamburg, FLASH. The impacts of coherent synchrotron radiation, intra beam scattering, and high peak current operation are investigated.

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Section: Implications Of Intra Beam Scatteringmentioning

confidence: 99%

longitudinal space charge assisted echo seeding of a free electron laser

Hacker

2015

SPIE Proceedings

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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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Semi-analytical analysis of high-brightness microbunched beam dynamics with collective and intrabeam scattering effects

Tsai

Qin

2021

Physics of Plasmas

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The studies of incoherent single-particle and collective multi-particle effects are, in general, separated in accelerator beam dynamics in that the two dynamical phenomena involve quite different time scales. Recent experimental measurements indicate that in some parameter regime, the small-angle, multiple scattering effects within a high-brightness electron beam can have a strong influence on microbunched beam dynamics. In this paper, we apply our recently developed semi-analytical kinetic analysis to investigate the collective phase space microbunched dynamics in the presence of incoherent single-particle effects. Particular emphasis will be placed on evaluation of the intrinsic or slice energy spread. An example of two linear beam transport lines, followed by two identical, interleaving bunch compressor chicanes, is then presented. The semi-analytical calculations are consistent with particle tracking simulations. Moreover, the threshold condition is derived, indicating the relation among relevant physical quantities. At threshold, the incoherent effect can be beneficial for effective suppression of the collective microbunching instability. We expect that this work could shed light on high-brightness electron transport beamline design to improve short-wavelength free-electron laser performance.

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Intrabeam scattering in high brightness electron linacs

Cited by 7 publications

References 25 publications

longitudinal space charge assisted echo seeding of a free electron laser

longitudinal space charge assisted echo seeding of a free electron laser

Characterisation of microbunching instability with 2D Fourier analysis

Semi-analytical analysis of high-brightness microbunched beam dynamics with collective and intrabeam scattering effects

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