The Orsay storage ring free electron laser: New results

Billardon, M.; Elleaume, P.; Lapierre, Y.; Ortéga, J. M.; Bazin, C.; Bergher, M.; Marilleau, J.; Pétroff, Y.

doi:10.1016/0168-9002(86)90855-7

Cited by 18 publications

(6 citation statements)

References 11 publications

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“…To suppress parasitic oscillations in a Raman FEL device, one may want to replace the tungsten mesh with a short attenuating section in the manner used in TWTs [2]. To improve the gain, when the gains are too low, one may want to insert a (dispersive) drift region between the buncher and the emitter [5], [6], [7] as is done in Compton-type FELs. In either case, improvements and system optimization require detailed numerical simulations which are described in a companion paper [10].…”

Section: Discussionmentioning

confidence: 99%

“…To make the prebunching more rapid, an intervening dispersive element can also be inserted [5], [6], [7]. Thus, such configurations are quite unlike a conventional FEL where bunching and stimulated emission are fully spatially intermingled.…”

Section: Experimental Arrangementmentioning

confidence: 99%

“…In the case of free electron lasers (FEL), systems with prebunching are referred to as optical klystrons. The concept [5] has been employed successfully to increase the overall optical gain both at the fundamental [6] and at high harmonics [7].…”

Section: Introductionmentioning

confidence: 99%

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Effects of electron prebunching on the radiation growth rate of a collective (Raman) free-electron laser amplifier

Leibovitch¹,

Bekefi

1988

IEEE J. Quantum Electron.

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Experiments are reported on the effects of electron prebunching in a mildly relativistic, low current (200kV, 1A) free electron laser amplifier operating in the collective (Raman) regime at a frequency of %1OGHz. Prebunching is established by injecting an electromagnetic wave into a bifilar.helical wiggler and then transporting the bunched beam into a second magnetic wiggler region. The wave growth rate is deduced from measurements of the radiation intensity as a function of interaction length. Observations show that prebunching can increase the radiation growth rate manyfold as compared with a system without prebunching. Studies are presented both in the small signal (linear) regime, and in the nonlinear (saturated) regime. tPermanent

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Arrangementmentioning

confidence: 99%

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Effects of electron prebunching on the radiation growth rate of a collective (Raman) free-electron laser amplifier

Leibovitch¹,

Bekefi

1988

IEEE J. Quantum Electron.

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“…For example, using the Vernier effect of a double cavity resonator to reduce the number of intra-cavity longitudinal modes and subsequent external filtering, an RF-linac-based FEL oscillator was able to provide a single longitudinal mode [54]. FEL oscillators based on storage rings provide a lower relative linewidth within the range 10 −5 to 5 × 10 −4 [34,[55][56][57][58][59][60][61][62][63], due to the higher electron beam quality of storage rings.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Slot

Freund

2021

Applied Sciences

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum, from microwaves through to X-rays, and in a variety of configurations, including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators, ranging from systems with high-quality resonators combined with low-gain undulators, to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present, for selected cases, how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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“…The storage ring has been very successfully applied te a visible wavelength FEL both in France [16,17], the Aco and Super Aco devices at Orsay, and in the Soviet Union on the VEPP 3-device at Novosibirsk [18,19].…”

Section: Storage Ring Felmentioning

confidence: 99%