Generation of narrow-band X-ray free-electron laser via reflection self-seeding

Inoue, Ituro; Osaka, Taito; Hara, Toru; Tanaka, Takashi; Inagaki, Terumi; Fukui, Toru; Goto, Shunji; Inubushi, Yuichi; Kimura, Hiroaki; Kinjo, Ryota; Ohashi, Haruhiko; Togawa, Kazuaki; Tono, Kensuke; Yamaga, Mitsuhiro; Tanaka, Hitoshi; Ishikawa, Tetsuya; Yabashi, Makina

doi:10.1038/s41566-019-0365-y

Cited by 106 publications

(64 citation statements)

References 23 publications

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“…The resulting particles velocity gradient is so steep that the undulator dispersion drives the energy to density modulation conversion while simultaneously stretching the density modulation period (ahead traveling faster than tail particles). This effect is usually negligible on RFA based FELs, even though observed on a self-seeding configuration [43]. In the case of LPA beams however, the stretching is such that the final FEL wavelength can be red shifted by more than one seed linewidth.…”

Section: Introductionmentioning

confidence: 99%

Interferometry for full temporal reconstruction of laser-plasma accelerator-based seeded free electron lasers

et al. 2020

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The spectacular development of Laser-Plasma Accelerators (LPA) appears very promising for a free electron laser application. The handling of the inherent properties of those LPA beams already allowed controlled production of LPA-based spontaneous undulator radiation. Stepping further, we here unveil that the forthcoming LPA-based seeded FELs will present distinctive spatio-spectral distributions. Relying on numerical simulations and simple analytical models, we show how those interferometric patterns can be exploited to retrieve, in single-shot, the spectro-temporal content and source point properties of the FEL pulses.

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Section: Introductionmentioning

confidence: 99%

Interferometry for full temporal reconstruction of laser-plasma accelerator-based seeded free electron lasers

et al. 2020

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“…The photon number decreases proportional to the narrowing of the bandwidth. In addition to these two basic operation modes, a self-seeded XFEL operation has been achieved for generating a bright quasi-monochromatic beam [21]. Moreover, two-color XFEL, which produces two XFEL pulses of different energies with a delay time up to 300 fs, is also available [22].…”

Section: Xfel and Focusing Opticsmentioning

confidence: 99%

Development of an Experimental Platform for Combinative Use of an XFEL and a High-Power Nanosecond Laser

et al. 2020

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We developed an experimental platform for combinative use of an X-ray free electron laser (XFEL) and a high-power nanosecond laser. The main target of the platform is an investigation of matter under high-pressure states produced by a laser-shock compression. In this paper, we show details of the experimental platform, including XFEL parameters and the focusing optics, the laser irradiation system and X-ray diagnostics. As a demonstration of the high-power laser-pump XFEL-probe experiment, we performed an X-ray diffraction measurement. An in-situ single-shot X-ray diffraction pattern expands to a large angle side, which shows a corundum was compressed by laser irradiation.

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“…Bragg re ections (ie., 33-3 or 115) with an FBD bandwidth of ~0.1 eV, instead of the 004 re ection with a ~0.3-eV bandwidth, as typically used in short-pulse modes 17,24 . Unlike the self-seeding in re ection geometry 21,22 , the path length delay of the seed pulse does not depend on the crystal index, so the high-index Bragg re ections, like 33-3 or 115, can be used to generate a seed bandwidth < 0.1 eV. For a better overlap with long e-bunch and a higher seed intensity, we use the 0 th -order wake of the FBD signal as the monochromatic seed instead of the 1 st -order wake that has been used in previous experiments ( Fig.…”

Section: Improving the Spectral Brightness Of Self-seeded Xfelmentioning

confidence: 99%

High-Brightness Self-seeded X-ray Free Electron Laser to Precisely Map Macromolecular Structure

Kang

Min

Nam

et al. 2020

Preprint

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We demonstrate a hard-X-ray self-seeded (HXRSS) free-electron laser (FEL) at Pohang Accelerator Laboratory with an unprecedented peak brightness (3.2 × 1035 photons/(s·mm2·mrad2·0.1%BW)). The self-seeded FEL generates hard X-ray pulses with improved spectral purity; the average pulse energy was 0.85 mJ at 9.7 keV, almost as high as in SASE mode; the bandwidth (0.19 eV) is about 1/70 as wide, the peak spectral brightness is 40 times higher than in self-amplified spontaneous emission (SASE) mode, and the stability is excellent with > 94% of shots exceeding the average SASE intensity. Using this self-seeded XFEL, we conducted serial femtosecond crystallography (SFX) experiments to map the structure of lysozyme protein; data-quality metrics such as Rsplit, multiplicity, and signal-to-noise ratio for the SFX were substantially increased. We precisely map out the structure of lysozyme protein with substantially better statistics for the diffraction data and significantly sharper electron density maps compared to maps obtained using SASE mode.

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Generation of narrow-band X-ray free-electron laser via reflection self-seeding

Cited by 106 publications

References 23 publications

Interferometry for full temporal reconstruction of laser-plasma accelerator-based seeded free electron lasers

Interferometry for full temporal reconstruction of laser-plasma accelerator-based seeded free electron lasers

Development of an Experimental Platform for Combinative Use of an XFEL and a High-Power Nanosecond Laser

High-Brightness Self-seeded X-ray Free Electron Laser to Precisely Map Macromolecular Structure

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