Science Opportunities at the SwissFEL X-ray Laser

Pàtterson, B. D.; Beaud, P.; Braun, H.; Dejoiea, Catherine; Ingold, G.; Milne, Christopher J.; Patthey, L.; Pedrini, Bill; Szlachentko, Jakub

doi:10.2533/chimia.2014.73

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…Free-electron lasers (FELs) open up new possibilities for such experiments because of their highly intense pulses with lengths in the femtosecond range, and repetition rates from a few Hz up to kHz. As discussed by B. Patterson et al in this issue, [61] the massive improvements in peak brightness and pulse duration of FEL radiation will enable new types of experiments ranging from the study of the structure and lifetime of short-lived molecular states in solution or on a catalytic surface to the investigation at atomic resolution of the structure of biological and inorganic nanostructures, to mention but a few. While the X-ray freeelectron lasers readily take the crown in some measures of performance, the large and steady throughput of synchrotron facilities will continue to serve the bulk of the X-ray community.…”

Section: Discussionmentioning

confidence: 99%

Coherent X-ray Imaging: Bridging the Gap between Atomic and Micro-scale Investigations

Stampanoni

Menzel

Watts

et al. 2014

Chimia

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We present a review of state-of-the art X-ray imaging techniques based on partially coherent synchrotron radiation. Full-field X-ray tomography, X-ray ptychography, scanning small-angle X-ray scattering, and scanning transmission X-ray microscopy are imaging techniques that gather structural information at spatial resolution ranging from several microns to a few tens of nanometers in both real-and reciprocal space. These methods exploit contrast mechanisms based on absorption, phase, and spectroscopic signals. We provide examples of how these techniques can be applied to address scientific questions ranging from imaging of biological samples, to foam rheology, and cement composition.

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Section: Discussionmentioning

confidence: 99%

Coherent X-ray Imaging: Bridging the Gap between Atomic and Micro-scale Investigations

Stampanoni

Menzel

Watts

et al. 2014

Chimia

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“…The possibility of measuring more Bragg peaks in a single shot is particularly interesting for samples with small unit cells. As a 4% energy bandpass beam was planned at the Swiss free-electron laser (SwissFEL) (Patterson et al, 2014), we developed a methodology to simulate such data and implement the data processing appropriate for small-unit-cell samples. An initial indexing of the simulated data was carried out using a Laue microdiffraction approach, showing that such a Laue indexing algorithm could be adapted to index data collected over a smaller energy bandpass (Dejoie, McCusker, Baerlocher, Abela et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Pattern-matching indexing of Laue and monochromatic serial crystallography data for applications in materials science

Dejoie¹,

Tamura²

2020

J Appl Cryst

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Serial crystallography data can be challenging to index, as each frame is processed individually, rather than being processed as a whole like in conventional X-ray single-crystal crystallography. An algorithm has been developed to index still diffraction patterns arising from small-unit-cell samples. The algorithm is based on the matching of reciprocal-lattice vector pairs, as developed for Laue microdiffraction data indexing, combined with threedimensional pattern matching using a nearest-neighbors approach. As a result, large-bandpass data (e.g. 5-24 keV energy range) and monochromatic data can be processed, the main requirement being prior knowledge of the unit cell. Angles calculated in the vicinity of a few theoretical and experimental reciprocal-lattice vectors are compared, and only vectors with the highest number of common angles are selected as candidates to obtain the orientation matrix. Global matching on the entire pattern is then checked. Four indexing options are available, two for the ranking of the theoretical reciprocal-lattice vectors and two for reducing the number of possible candidates. The algorithm has been used to index several data sets collected under different experimental conditions on a series of model samples. Knowing the crystallographic structure of the sample and using this information to rank the theoretical reflections based on the structure factors helps the indexing of large-bandpass data for the largestunit-cell samples. For small-bandpass data, shortening the candidate list to determine the orientation matrix should be based on matching pairs of reciprocal-lattice vectors instead of triplet matching.

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“…The whizzy photo cathode is made of flat copper and includes an ultraviolet (UV) laser. The UV laser-induced copper cathode satisfies the strictest specifications (200 pC, 10-picosecond electron pulses, and an intrinsic transverse emittance that is less than 0.2 mm-mrad) required for X-FEL photo cathodes [1], [2]. In recent years, a laser-induced, nano-tip-based plasmonic double-gate structure (NPDS) has been proposed as a the nextgeneration photo cathode for ultrafast electron generation [3]- [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Plasmon Enhanced Field Emitter Array Using a Nano-Tip-Based Plasmonic Double-Gate Structure

Lee

Choi

Song

et al. 2016

J. Lightwave Technol.

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A nano-tip-based plasmonic double-gate structure (NPDS) excited by the surface plasmon polariton (SPP) resonance of the gate electrode has recently been proposed to achieve the specifications of the UV laser-induced copper cathode. The function of the NPDS is to generate a high bunch charge via nearinfrared laser-induced field emission without increasing the cathode size. In this study, we report detailed numerical studies of the proposed NPDS to elucidate the physical mechanism of SPP propagation and light-tip coupling via internal SPP resonance. The simulation results show the relationship between the internal SPP resonance and the tip-light coupling in the NPDS, and the feasibility to achieve significant field emission enhancements with the NPDS. Understanding the internal SPP field in the plasmonic double-gate structure and the light field-tip coupling process in the NPDS is of practical importance in designing field emitter devices and could become an important factor in future high-brightness free-electron laser cathodes and high-sensitivity optical biosensors. Index Terms-Surface plasmons (SPs), Nano plasmonics, Nano structure, Free-electron laser cathodeTae Young Kang is with the

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Science Opportunities at the SwissFEL X-ray Laser

Cited by 15 publications

References 19 publications

Coherent X-ray Imaging: Bridging the Gap between Atomic and Micro-scale Investigations

Coherent X-ray Imaging: Bridging the Gap between Atomic and Micro-scale Investigations

Pattern-matching indexing of Laue and monochromatic serial crystallography data for applications in materials science

Optimization of a Plasmon Enhanced Field Emitter Array Using a Nano-Tip-Based Plasmonic Double-Gate Structure

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