Large harmonic bunching in a high-gain free-electron laser

Bonifacio, R.; Salvo, Luc; Pierini, P.

doi:10.1016/0168-9002(90)90334-3

Cited by 126 publications

(66 citation statements)

References 3 publications

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“…Close to saturation, strong bunching at this wavelength produces rich harmonic bunching as well [63]. Three-dimensional simulations [64] and analytical results [65] show that significant odd harmonic power can exist for a planar undulator at the FEL saturation.…”

Section: Shift Compensates Phase Errormentioning

confidence: 99%

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Ratner

2011

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Section: Shift Compensates Phase Errormentioning

confidence: 99%

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Ratner

2011

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“…In the first one, we take advantage of the vortex nature of harmonics emitted in a helical undulator [26,27]; however, unlike the previous experiment [28], where XUV vortices were produced by incoherent undulator emission, we exploit high-harmonic [29] and nonlinear harmonic generation [30][31][32][33] to obtain intense, femtosecond, coherent XUV vortices from a chain of six undulators at the FERMI FEL [34]. The method can be easily implemented at existing FEL facilities.…”

Section: Introductionmentioning

confidence: 99%

Free-Electron Laser Does the Twist

Penn

2017

Physics

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Extreme-ultraviolet vortices may be exploited to steer the magnetic properties of nanoparticles, increase the resolution in microscopy, and gain insight into local symmetry and chirality of a material; they might even be used to increase the bandwidth in long-distance space communications. However, in contrast to the generation of vortex beams in the infrared and visible spectral regions, production of intense, extremeultraviolet and x-ray optical vortices still remains a challenge. Here, we present an in-situ and an ex-situ technique for generating intense, femtosecond, coherent optical vortices at a free-electron laser in the extreme ultraviolet. The first method takes advantage of nonlinear harmonic generation in a helical undulator, producing vortex beams at the second harmonic without the need for additional optical elements, while the latter one relies on the use of a spiral zone plate to generate a focused, micron-size optical vortex with a peak intensity approaching 10 14 W=cm 2 , paving the way to nonlinear optical experiments with vortex beams at short wavelengths.

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“…This microbunching, in turn, gives rise to enhanced nonlinear harmonic growth and can become the dominant harmonic growth mechanism [2][3][4][5][6][7]. The alternative method of the two-beam FEL was proposed to generate more intensified short wavelength power based on harmonic generation mechanism [8,9].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the effect of wiggler imperfections on harmonic generation in two-beam free-electron lasers

Zahedian

Maraghechi

2012

Phys. Rev. ST Accel. Beams

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A three-dimensional simulation of a free-electron laser (FEL) with two beams is used to study the sensitivity of the third harmonic due to wiggler imperfections. In the two-beam FEL, for a fundamental wavelength of 107.5 nm, the power will be converted to the third harmonic at a shorter wavelength, in this case in the extreme ultraviolet at 35.8 nm. In this arrangement, the fundamental resonance of the higher energy beam coincides with the third harmonic of the lower energy beam, for this energy conversion to take place. For enhanced focusing, a planar wiggler with parabolic pole face is considered. Investigation of the effect of wiggler errors on the efficiencies of harmonic and fundamental resonance of the two-beam and the one-beam FEL shows that the average efficiency for the third harmonic in the two-beam FEL is decreased by 36% while the reduction of average efficiency for the fundamental of the two-beam is 55% and for the third harmonic of the one-beam is 48%. This shows that the third harmonic radiation in the two-beam FEL is less sensitive to wiggler imperfection compared to its fundamental as well as the third harmonic in the one-beam FEL. The reason is that the energy that transfers to the third harmonic of the two-beam FEL comes from both electron beams. It was also found that, for almost all cases, standard deviation increases with an increasing level of wiggler imperfection while, for the two-beam FEL, saturation length of the fundamental resonance decreases and the third harmonic increases with increasing wiggler imperfection.

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Large harmonic bunching in a high-gain free-electron laser

Cited by 126 publications

References 3 publications

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Free-Electron Laser Does the Twist

Simulation of the effect of wiggler imperfections on harmonic generation in two-beam free-electron lasers

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