At-wavelength characterization of X-ray wavefronts in Bragg diffraction from crystals
The advent of next-generation synchrotron radiation sources and X-ray free-electron lasers calls for high-quality Bragg-diffraction crystal optics to preserve the X-ray beam coherence and wavefront. This requirement brings new challenges in characterizing crystals in Bragg diffraction in terms of Bragg-plane height errors and wavefront phase distortions. Here, a quantitative methodology to characterize crystal optics using a state-of-the-art at-wavelength wavefront sensing technique and statistical analysis is proposed. The method was tested at the 1-BM-B optics testing beamline at the Advanced Photon Source for measuring ...
Source: Journal of Synchrotron Radiation - October 10, 2023 Category: Physics Authors: Shi, X. Qiao, Z. Pradhan, P. Liu, P. Assoufid, L. Kim, K.-J. Shvyd'ko, Y. Tags: wavefront sensing crystal diffraction coded mask phase error at-wavelength metrology research papers Source Type: research
Monocrystalline diamond detector for online monitoring during synchrotron microbeam radiotherapy
Microbeam radiation therapy (MRT) is a radiotherapy technique combining spatial fractionation of the dose distribution on a micrometric scale, X-rays in the 50 – 500 keV range and dose rates up to 16 × 103 Gy s − 1. Nowadays, in vivo dosimetry remains a challenge due to the ultra-high radiation fluxes involved and the need for high-spatial-resolution detectors. The aim here was to develop a striped diamond portal detector enabling online microbeam monitoring during synchrotron MRT treatments. The detector, a 550 µ m bulk monocrystalline diamond, is an eight-strip device, of height 3 mm, width 178 ...
Source: Journal of Synchrotron Radiation - October 10, 2023 Category: Physics Authors: di Franco, F. Rosuel, N. Gallin-Martel, L. Gallin-Martel, M.-L. Ghafooryan-Sangchooli, M. Keshmiri, S. Motte, J.-F. Muraz, J.-F. Pellicioli, P. Ruat, M. Serduc, R. Verry, C. Dauvergne, D. Adam, J.-F. Tags: monocrystalline diamond detectors synchrotron microbeam radiotherapy online dosimetry research papers Source Type: research
Resonant X-ray emission spectroscopy using self-seeded hard X-ray pulses at PAL-XFEL
Self-seeded hard X-ray pulses at PAL-XFEL were used to commission a resonant X-ray emission spectroscopy experiment with a von Hamos spectrometer. The self-seeded beam, generated through forward Bragg diffraction of the [202] peak in a 100 µ m-thick diamond crystal, exhibited an average bandwidth of 0.54 eV at 11.223 keV. A coordinated scanning scheme of electron bunch energy, diamond crystal angle and silicon monochromator allowed us to map the Ir L β 2 X-ray emission lines of IrO2 powder across the Ir L3-absorption edge, from 11.212 to 11.242 keV with an energy step of 0.3 eV. This work provides...
Source: Journal of Synchrotron Radiation - September 22, 2023 Category: Physics Authors: Choi, T.-K. Park, J. Kim, G. Jang, H. Park, S.-Y. Sohn, J.H. Cho, B.I. Kim, H. Kim, K.S. Nam, I. Chun, S.H. Tags: X-ray free-electron laser (XFEL) self-seeding resonant X-ray emission spectroscopy (RXES) von Hamos spectrometer research papers Source Type: research
In situ synchrotron X-ray total scattering measurements and analysis of colloidal CsPbX3 nanocrystals during flow synthesis
In situ X-ray scattering measurements of CsPbX3 (X = Cl, Br, I) nanocrystal formation and halide exchange at NSLS-II beamlines were performed in an automated flow reactor. Total scattering measurements were performed at the 28-ID-2 (XPD) beamline and small-angle X-ray scattering at the 16-ID (LiX) beamline. Nanocrystal structural parameters of interest, including size, size distribution and atomic structure, were extracted from modeling the total scattering data. The results highlight the potential of these beamlines and the measurement protocols described in this study for studying dynamic processes of colloidal nanocryst...
Source: Journal of Synchrotron Radiation - September 22, 2023 Category: Physics Authors: Greenberg, M.W. Lin, C.-H. Chodankar, S. Ghose, S.K. Tags: perovskites nanocrystals small-angle X-ray scattering X-ray total scattering nucleation pair distribution function research papers Source Type: research
Laboratory-based X-ray spectrometer for actinide science
X-ray absorption and emission spectroscopies nowadays are advanced characterization methods for fundamental and applied actinide research. One of the advantages of these methods is to reveal slight changes in the structural and electronic properties of radionuclides. The experiments are generally carried out at synchrotrons. However, considerable progress has been made to construct laboratory-based X-ray spectrometers for X-ray absorption and emission spectroscopies. Laboratory spectrometers are reliable, effective and accessible alternatives to synchrotrons, especially for actinide research, which allow dispensing with hi...
Source: Journal of Synchrotron Radiation - September 22, 2023 Category: Physics Authors: Novichkov, D. Trigub, A. Gerber, E. Nevolin, I. Romanchuk, A. Matveev, P. Kalmykov, S. Tags: laboratory-based X-ray spectrometers X-ray absorption spectroscopy X-ray emission spectroscopy research papers Source Type: research
Online dynamic flat-field correction for MHz microscopy data at European XFEL
The high pulse intensity and repetition rate of the European X-ray Free-Electron Laser (EuXFEL) provide superior temporal resolution compared with other X-ray sources. In combination with MHz X-ray microscopy techniques, it offers a unique opportunity to achieve superior contrast and spatial resolution in applications demanding high temporal resolution. In both live visualization and offline data analysis for microscopy experiments, baseline normalization is essential for further processing steps such as phase retrieval and modal decomposition. In addition, access to normalized projections during data acquisition can play ...
Source: Journal of Synchrotron Radiation - September 20, 2023 Category: Physics Authors: Birnsteinova, S. Ferreira de Lima, D.E. Sobolev, E. Kirkwood, H.J. Bellucci, V. Bean, R.J. Kim, C. Koliyadu, J.C.P. Sato, T. Dall'Antonia, F. Asimakopoulou, E.M. Yao, Z. Buakor, K. Zhang, Y. Meents, A. Chapman, H.N. Mancuso, A.P. Villanueva-Perez, P. Vago Tags: MHz X-ray microscopy flat-field correction online data processing X-ray free-electron laser research papers Source Type: research
A high-throughput big-data orchestration and processing system for the High Energy Photon Source
High-data-throughput and multimodal-acquisition experiments will prevail in next-generation synchrotron beamlines. Orchestrating dataflow pipelines connecting the data acquisition, processing, visualization and storage ends are becoming increasingly complex and essential for enhancing beamline performance. Mamba Data Worker (MDW) has been developed to address the data challenges for the forthcoming High Energy Photon Source (HEPS). It is an important component of the Mamba experimental control and data acquisition software ecosystem, which enables fast data acquisition and transmission, dynamic configuration of data proces...
Source: Journal of Synchrotron Radiation - September 20, 2023 Category: Physics Authors: Li, X. Zhang, Y. Liu, Y. Li, P. Hu, H. Wang, L. He, P. Dong, Y. Zhang, C. Tags: beamline software data acquisition data management high-throughput experiment multimodal experiments research papers Source Type: research
Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources
Free-electron-laser-based beamlines utilize fully coherent laser pulses with extremely narrow bandwidth allowing direct use of X-rays without monochromators. This could be very beneficial for all users of current and future fourth-generation diffraction-limited synchrotron light sources (DL-SLSs) who need narrowband full-coherence high-brightness X-ray pulses. Based on our previous finding, i.e. that separating the two stages of echo-enabled harmonic generation (EEHG) with a few extra bending-magnet sections provides an effective way to increase the momentum compaction of chicane 1, one can simultaneously achieve adequate ...
Source: Journal of Synchrotron Radiation - August 24, 2023 Category: Physics Authors: Yang, X. Yu, L.H. Smaluk, V. Shaftan, T. Huang, X. Tags: storage-ring-based free-electron lasers cascaded echo-enabled harmonic generation diffraction-limited synchrotron light sources coherent radiation SASE and XFEL oscillators research papers Source Type: research
Pb speciation and elemental distribution in leeks by micro X-ray fluorescence and X-ray absorption near-edge structure
In this study, leek plants and soil from vegetable gardens near lead – zinc mines were collected and cultivated with 500 mg L − 1 PbNO3 solutions for three weeks. Micro X-ray fluorescence was used to map the distribution of Pb and other chemical elements in leek roots, and X-ray absorption near-edge spectroscopy was used to assess the Pb speciation in leek roots and leaves. These findings demonstrated that Pb, Cu, Mn, Cr, Ti and Fe were detected in the outer rings of the root's cross section, and high-intensity points were observed in the epidermis. Zn, K and Ca, on the other hand, were distributed throughout t...
Source: Journal of Synchrotron Radiation - August 24, 2023 Category: Physics Authors: Sun, J. Yang, Y. Luo, L. Tags: heavy metal spatial distribution synchrotron radiation XANES detoxification mechanism research papers Source Type: research
BL09XU: an advanced hard X-ray photoelectron spectroscopy beamline of SPring-8
The BL09XU beamline of SPring-8 has been reorganized into a beamline dedicated for hard X-ray photoelectron spectroscopy (HAXPES) to provide advanced capabilities with upgraded optical instruments. The beamline has two HAXPES analyzers to cover a wide range of applications. Two sets of double channel-cut crystal monochromators with the Si(220) and (311) reflections were installed to perform resonant HAXPES analyses with a total energy resolution of less than 300 meV over a wide energy range (4.9 – 12 keV) while achieving a fixed-exit condition. A double-crystal X-ray phase retarder using diamond crystals controls...
Source: Journal of Synchrotron Radiation - August 23, 2023 Category: Physics Authors: Yasui, A. Takagi, Y. Osaka, T. Senba, Y. Yamazaki, H. Koyama, T. Yumoto, H. Ohashi, H. Motomura, K. Nakajima, K. Sugahara, M. Kawamura, N. Tamasaku, K. Tamenori, Y. Yabashi, M. Tags: hard X-ray photoelectron spectroscopy HAXPES beamlines X-ray optics high-flux microbeams double-crystal X-ray phase retarders Source Type: research
Exploring beam size measurement based on the Talbot effect at BEPCII
Vertical beam size measurements were carried out at Beijing Electron – Positron Collider II (BEPCII) using a phase grating and an absorption grating based on the Talbot effect. The transverse coherence of synchrotron radiation is closely related to beam size. Due to the partial coherence of the synchrotron radiation source, the coherence length can be calculated by measuring the visibility decay of interferograms recorded at different distances behind the gratings. A vertical beam size of 68.19 ± 2 µ m was obtained based on the relationship between the coherence length and beam size at the 3W1 beamline of BEPCII. A...
Source: Journal of Synchrotron Radiation - August 23, 2023 Category: Physics Authors: Zhang, W. Zhu, D. Sui, Y. Yue, J. Cao, J. He, J. Tags: Talbot effect interferograms visibility coherence length beam size measurement synchrotron radiation light source research papers Source Type: research
Mutual optical intensity propagation through non-ideal two-dimensional mirrors
The mutual optical intensity (MOI) model is a partially coherent radiation propagation tool that can sequentially simulate beamline optics and provide beam intensity, local degree of coherence and phase distribution at any location along a beamline. This paper extends the MOI model to non-ideal two-dimensional (2D) optical systems, such as ellipsoidal and toroidal mirrors with 2D figure errors. Simulation results show that one can tune the trade-off between calculation efficiency and accuracy by varying the number of wavefront elements. The focal spot size of an ellipsoidal mirror calculated with 100 × 100 element...
Source: Journal of Synchrotron Radiation - August 23, 2023 Category: Physics Authors: Meng, X. Wang, Y. Shi, X. Ren, J. Sun, W. Cao, J. Li, J. Tai, R. Tags: synchrotron beamline partially coherent light mutual optical intensity two-dimensional mirrors research papers Source Type: research
Inversion model for extracting chemically resolved depth profiles across liquid interfaces of various configurations from XPS data: PROPHESY
PROPHESY, a technique for the reconstruction of surface-depth profiles from X-ray photoelectron spectroscopy data, is introduced. The inversion methodology is based on a Bayesian framework and primal-dual convex optimization. The acquisition model is developed for several geometries representing different sample types: plane (bulk sample), cylinder (liquid microjet) and sphere (droplet). The methodology is tested and characterized with respect to simulated data as a proof of concept. Possible limitations of the method due to uncertainty in the attenuation length of the photo-emitted electron are illustrated. (Source: Journ...
Source: Journal of Synchrotron Radiation - August 23, 2023 Category: Physics Authors: Ozon, M. Tumashevich, K. Lin, J.J. Prisle, N.L. Tags: X-ray photoelectron spectroscopy depth profile inversion algorithm atmospheric surfaces acquisition model research papers Source Type: research
Counting on the future: fast charge-integrating detectors for X-ray nanoimaging
(Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - August 23, 2023 Category: Physics Authors: Deng, J. Miceli, A. Jacobsen, C. Tags: coherent diffraction imaging fast charge-integrating detectors X-ray nanoimaging commentary scientific commentaries Source Type: research
CatMass: software for calculating optimal sample masses for X-ray absorption spectroscopy experiments involving complex sample compositions
This paper presents software for calculating the optimal mass of samples with complex compositions (e.g. supported metal catalysts) for X-ray absorption spectroscopy (XAS) and scattering measurements. The ability to calculate the sample mass and other relevant parameters needed for an XAS measurement allows experimentalists to be better prepared in terms of detector selection, energy range of scan and overall time needed to complete the measurement, thus increasing efficiency. CatMass builds on existing sample mass calculators allowing users to determine the optimum sample preparation, collection geometry, usable energy ra...
Source: Journal of Synchrotron Radiation - August 18, 2023 Category: Physics Authors: Perez-Aguilar, J.E. Caine, A. Bare, S.R. Hoffman, A.S. Tags: CatMass XAS catalysts sample preparation optimization computer programs Source Type: research
