Seeded X-ray free-electron laser generating radiation with laser statistical properties

Gorobtsov, Oleg; Mercurio, Giuseppe; Capotondi, Flavio; Skopintsev, Petr; Lazarev, Sergey; Zaluzhnyy, Ivan A.; Danailov, M. B.; Dell’Angela, Martina; Manfredda, Michele; Pedersoli, Emanuele; Giannessi, L.; Кискинова, М.; Prince, Kevin C.; Würth, W.; Vartanyants, Ivan A.

doi:10.1038/s41467-018-06743-8

Cited by 58 publications

(33 citation statements)

References 38 publications

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“…The light from previous micro-bunches seeds the following, a process which may be repeated until the final spike is seeded in all the amplifier sections. The second-order coherence should be greatly improved by this coupling, as shown recently in a seeded XFEL [114].…”

Section: Physics Applicationsmentioning

confidence: 70%

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Rosenzweig

2019

Advances in Laboratory-Based X-Ray Sources, Optics, and Applications VII

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In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are: advanced, high gradient acceleration techniques, and xray free electron lasers (XFELs). Further, there is intense interest in the marriage of these two fields, with the goal of producing a very compact XFEL. In this context, recent advances in high gradient radio-frequency cryogenic copper structure research have opened the door to the use of surface electric fields between 250 and 500 MV/m. Such an approach is foreseen to enable a new generation of photoinjectors with sixdimensional beam brightness beyond the current state-of-the-art by well over an order of magnitude. This advance is an essential ingredient enabling an ultra-compact XFEL (UC-XFEL). In addition, one may accelerate these bright beams to GeV scale in less arXiv:2003.06083v1 [physics.acc-ph]An Ultra-Compact X-Ray Free-Electron Laser 2 than 10 meters. Such an injector, when combined with inverse free electron laserbased bunching techniques can produce multi-kA beams with unprecedented beam quality, quantified by 50 nm-rad normalized emittances. These beams, when injected into innovative, short-period (1-10 mm) undulators uniquely enable UC-XFELs having footprints consistent with university-scale laboratories. We describe the architecture and predicted performance of this novel light source, which promises photon production per pulse of a few percent of existing XFEL sources. We review implementation issues including collective beam effects, compact x-ray optics systems, and other relevant technical challenges. To illustrate the potential of such a light source to fundamentally change the current paradigm of XFELs with their limited access, we examine possible applications in biology, chemistry, materials, atomic physics, industry, and medicine which may profit from this new model of performing XFEL science.

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Section: Physics Applicationsmentioning

confidence: 70%

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Rosenzweig

2019

Advances in Laboratory-Based X-Ray Sources, Optics, and Applications VII

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“…FEL radiation has been measured to exhibit this distribution in the linear regime at multiple FEL facilities operating at different photon energies, e.g., in [10,15,[18][19][20][21][22][23]. We also note that in the limit of a very large M, Eq.…”

Section: A Probability Density Functionmentioning

confidence: 82%

Statistical theory of a self-seeded free electron laser with noise pedestal growth

Hemsing

Halavanau

Zhang

2020

Phys. Rev. Accel. Beams

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We study the impact of a spectral noise pedestal on the statistical properties of a self-seeded free electron laser (FEL). The broad pedestal is assumed to come from self amplified spontaneous emission (SASE) in the second stage of the self-seeding system and is uncorrelated with the narrowband amplified seed. An analytic description is developed based on the statistical theory of a one-dimensional FEL in the high gain linear regime. The theory shows good agreement with experimental data, which show that the presence of a SASE background can have a strong impact on the statistical behavior of self-seeding systems.

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“…The degeneracy parameter is about 10 10 . The constant phase and high-order coherence of the X-ray pulse is the property of XLO and will open experimental possibilities, for instance, in X-ray quantum optics experiments (19,65).…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In SASE mode (15,16), the X-ray pulse starts from electron shot noise. To improve longitudinal coherence and fluctuations, seeding with external lasers has been successfully implemented for wavelengths larger than a few nanometers (17)(18)(19)(20)(21)(22). For harder X-rays, self-seeding systems have been employed to reduce the energy bandwidth by an order of magnitude, e.g., at Linac Coherent Light Source (LCLS) from about 10 −3 to 10 −4 , but the pulses are not transform limited and suffer from large intensity fluctuations (23)(24)(25)(26)(27)(28)(29)(30)(31).…”

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confidence: 99%

Population inversion X-ray laser oscillator

Halavanau

Benediktovitch

Lutman

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Oscillators are at the heart of optical lasers, providing stable, transform-limited pulses. Until now, laser oscillators have been available only in the infrared to visible and near-ultraviolet (UV) spectral region. In this paper, we present a study of an oscillator operating in the 5- to 12-keV photon-energy range. We show that, using theKα1line of transition metal compounds as the gain medium, an X-ray free-electron laser as a periodic pump, and a Bragg crystal optical cavity, it is possible to build X-ray oscillators producing intense, fully coherent, transform-limited pulses. As an example, we consider the case of a copper nitrate gain medium generating ∼ 5 ×1010photons per pulse with 37-fs pulse length and 48-meV spectral resolution at 8-keV photon energy. Our theoretical study and simulation of this system show that, because of the very large gain per pass, the oscillator saturates and reaches full coherence in four to six optical-cavity transits. We discuss the feasibility and design of the X-ray optical cavity and other parts of the oscillator needed for its realization, opening the way to extend X-ray–based research beyond current capabilities.

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Seeded X-ray free-electron laser generating radiation with laser statistical properties

Cited by 58 publications

References 38 publications

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Statistical theory of a self-seeded free electron laser with noise pedestal growth

Population inversion X-ray laser oscillator

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