X-ray propagation through a kinoform lens
Combining geometric ray tracing and wave optics propagation, a new simulation model named LWF is established to calculate the full coherent X-ray propagation through a kinoform lens. The LWF model is used to analyze the X-ray propagation through long and short kinoform lenses and calculate the intensity distribution at the focal plane. When the aperture is large, the focal spot for the long kinoform lens is smaller than that for the short kinoform lens. Due to the use of the geometric ray-tracing method to calculate the beam propagation inside the kinoform lens, the LWF model takes a low number of transversal wavefront seg...
Source: Journal of Synchrotron Radiation - September 29, 2022 Category: Physics Authors: Sun, W. Wang, Y. Meng, X. Ren, J. Cao, J. Li, J. Tai, R. Tags: kinoform lens synchrotron radiation geometrical optics wave optics research papers Source Type: research
New data analysis for BioSAXS at the ESRF
This article describes FreeSAS, an open-source collection of various small-angle scattering analysis algorithms needed to reduce and analyze BioSAXS data, and Dahu, the tool used to interface data analysis with beamline control. It further presents the data-processing pipelines for the different data acquisitions modes of the beamline, using either a sample changer for individual homogeneous samples or an inline size-exclusion chromatography setup. (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - August 23, 2022 Category: Physics Authors: Kieffer, J. Brennich, M. Florial, J.-B. Oscarsson, M. De Maria Antolinos, A. Tully, M. Pernot, P. Tags: BioSAXS online data analysis solution scattering proteins biological small-angle X-ray scattering automation high brilliance structural biology high-throughput SAXS size-exclusion chromatography online purification computer programs Source Type: research
The soft X-ray monochromator at the SASE3 beamline of the European XFEL: from design to operation
The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with a pink or monochromatic beam in the photon energy range 250 – 3000 eV. Here, the focus is monochromatic operation of the SASE3 beamline, and the design and performance of the SASE3 grating monochromator are reported. The unique capability of a free-electron laser source to produce short femtosecond pulses of a high degree of coherence challenges the monochromator design by demanding control of both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high deman...
Source: Journal of Synchrotron Radiation - August 23, 2022 Category: Physics Authors: Gerasimova, N. La Civita, D. Samoylova, L. Vannoni, M. Villanueva, R. Hickin, D. Carley, R. Gort, R. Van Kuiken, B.E. Miedema, P. Le Guyarder, L. Mercadier, L. Mercurio, G. Schlappa, J. Teichman, M. Yaroslavtsev, A. Sinn, H. Scherz, A. Tags: soft X-ray monochromator diffraction grating FEL beamline beamlines Source Type: research
Microscopic observation of the effects of elongation on the polymer chain dynamics of crosslinked polybutadiene using quasi-elastic γ -ray scattering
A synchrotron-radiation-based quasi-elastic γ -ray scattering system has been developed that uses time-domain interferometry to observe microscopic polymer dynamics under uniaxial deformation. The stress-producing mechanism of crosslinked polybutadiene has been studied from a microscopic viewpoint. It was found that the mean relaxation time 〈 τ 〉 of the microscopic polymer motion observed over a relatively high temperature (T) range (i.e. T − 1 (Source: Journal of Synchrotron Radiation)
Source: Journal of Synchrotron Radiation - August 23, 2022 Category: Physics Authors: Mashita, R. Saito, M. Yoda, Y. Kishimoto, H. Seto, M. Kanaya, T. Tags: polymer dynamics quasi-elastic γ -ray scattering elongation research papers Source Type: research
Fe0.79Si0.07B0.14 metallic glass gaskets for high-pressure research beyond 1 Mbar
We report that Fe0.79Si0.07B0.14 metallic glass gaskets offer a stable sample environment under compression exceeding 1 Mbar in all XRD experiments described here, even in those involving small-molecule gases (e.g. Ne, H2) used as pressure-transmitting media or in those with laser heating in a DAC. Our results emphasize the material's importance for a great number of delicate experiments conducted under extreme conditions. They indicate that the application of Fe0.79Si0.07B0.14 metallic glass gaskets in XRD experiments for both axial and radial geometries substantially improves various aspects of megabar experiments an...
Source: Journal of Synchrotron Radiation - August 19, 2022 Category: Physics Authors: Dong, W. Glazyrin, K. Khandarkhaeva, S. Fedotenko, T. Bednar č í k, J. Greenberg, E. Dubrovinsky, L. Dubrovinskaia, N. Liermann, H.-P. Tags: diamond anvil cell (DAC) amorphous metal gasket metallic glass axial and radial high-pressure X-ray diffraction signal-to-noise ratio research papers Source Type: research
Upgraded imaging capabilities at the BAMline (BESSY II)
The BAMline at the BESSY II synchrotron X-ray source has enabled research for more than 20 years in widely spread research fields such as materials science, biology, cultural heritage and medicine. As a nondestructive characterization method, synchrotron X-ray imaging, especially tomography, plays a particularly important role in structural characterization. A recent upgrade of key equipment of the BAMline widens its imaging capabilities: shorter scan acquisition times are now possible, in situ and operando studies can now be routinely performed, and different energy spectra can easily be set up. In fact, the upgraded doub...
Source: Journal of Synchrotron Radiation - August 17, 2022 Category: Physics Authors: Mark ö tter, H. Sintschuk, M. Britzke, R. Dayani, S. Bruno, G. Tags: synchrotron radiation computed tomography double-multilayer monochromators pink beams X-ray optics beamlines Source Type: research
Fixed-target serial crystallography at the Structural Biology Center
Serial synchrotron crystallography enables the study of protein structures under physiological temperature and reduced radiation damage by collection of data from thousands of crystals. The Structural Biology Center at Sector 19 of the Advanced Photon Source has implemented a fixed-target approach with a new 3D-printed mesh-holder optimized for sample handling. The holder immobilizes a crystal suspension or droplet emulsion on a nylon mesh, trapping and sealing a near-monolayer of crystals in its mother liquor between two thin Mylar films. Data can be rapidly collected in scan mode and analyzed in near real-time using piez...
Source: Journal of Synchrotron Radiation - August 17, 2022 Category: Physics Authors: Sherrell, D.A. Lavens, A. Wilamowski, M. Kim, Y. Chard, R. Lazarski, K. Rosenbaum, G. Vescovi, R. Johnson, J.L. Akins, C. Chang, C. Michalska, K. Babnigg, G. Foster, I. Joachimiak, A. Tags: fixed-target serial synchrotron crystallography X-ray free-electron lasers structural biology research papers Source Type: research
Observation of water droplets in microporous layers for polymer electrolyte fuel cells by X-ray computed nano-tomography
An X-ray computed nano-tomography (nano-CT) system has been established at the BL33XU beamline of SPring-8. The optical system consists of pseudo-K ö hler illumination with a sector condenser zone plate, an apodization Fresnel zone plate as the objective lens, and a Zernike phase plate. The imaging detector is a fiber-coupling type X-ray camera. The performance of the X-ray nano-CT system was confirmed by imaging an X-ray test chart. The system was subsequently applied to the observation of a microporous layer for polymer electrolyte fuel cells and a simulated microporous layer including liquid water. The nano-CT system, ...
Source: Journal of Synchrotron Radiation - August 17, 2022 Category: Physics Authors: Yamaguchi, S. Kato, S. Yoshimune, W. Setoyama, D. Kato, A. Nagai, Y. Suzuki, T. Takeuchi, A. Uesugi, K. Tags: X-ray computed nano-tomography polymer electrolyte fuel cell gas diffusion layer microporous layer water droplet hydrophobic material research papers Source Type: research
Study of X-ray topography using the super-Borrmann effect
X-ray topography exerting the super-Borrmann effect has been performed using synchrotron radiation to display dislocation images with a high-speed and high-resolution CMOS camera. Forward-transmitted X-rays are positively employed instead of reflected X-rays to reveal dislocations in relatively thick crystals by simultaneously exciting a pair of adjacent {111} planes owing to the super-Borrmann effect. Before the experiment, minimum values of the attenuation coefficients AminP for σ and π polarizations of the incident X-rays in the three-beam case are calculated. Results demonstrate that AminP for both polarizations are ...
Source: Journal of Synchrotron Radiation - August 17, 2022 Category: Physics Authors: Matsui, J. Takatsu, K. Tsusaka, Y. Tags: topography super-Borrmann effect research papers Source Type: research
Synchrotron radiation X-ray imaging with large field of view and high resolution using micro-scanning method
In synchrotron radiation X-ray imaging, the imaging field of view and spatial resolution are mutually restricted, which makes it impossible to have both a large field of view and high resolution when carrying out experiments. Constructing an oversampled image through the micro-scanning method and using the deconvolution algorithm to eliminate the point spread function introduced by pixel overlap can increase the resolution under a fixed imaging field of view, thereby improving the ratio of the field of view to the spatial resolution. In this paper, numerical simulation and synchrotron radiation experiments are carried out ...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Sun, R. Wang, Y. Zhang, J. Deng, T. Yi, Q. Yu, B. Huang, M. Li, G. Jiang, X. Tags: synchrotron radiation X-ray imaging micro-scanning oversampled image point spread function (PSF) research papers Source Type: research
Multicolor single-analyzer high-energy-resolution XES spectrometer for simultaneous examination of different elements
The present work demonstrates the performance of a von H á mos high-energy-resolution X-ray spectrometer based on a non-conventional conical Si single-crystal analyzer. The analyzer is tested with different primary and secondary X-ray sources as well as a hard X-ray sensitive CCD camera. The spectrometer setup is also characterized with ray-tracing simulations. Both experimental and simulated results affirm that the conical spectrometer can efficiently detect and resolve the two pairs of two elements (Ni and Cu) K α X-ray emission spectroscopy (XES) peaks simultaneously, requiring a less than 2 cm-wide array on a sin...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Mikeh á zi, A. El Guettioui, J. F ö ldes, I.B. Vank ó , G. N é meth, Z. Tags: high-energy-resolution X-ray spectroscopies von H á mos geometry laser plasma ray tracing X-ray emission spectroscopy research papers Source Type: research
Application study of infrared free-electron lasers towards the development of amyloidosis therapy
Amyloidosis is known to be caused by the deposition of amyloid fibrils into various biological tissues; effective treatments for the disease are little established today. An infrared free-electron laser (IR-FEL) is an accelerator-based picosecond-pulse laser having tunable infrared wavelengths. In the current study, the irradiation effect of an IR-FEL was tested on an 11-residue peptide (NFLNCYVSGFH) fibril from β 2-microglobulin ( β 2M) with the aim of applying IR-FELs to amyloidosis therapy. Infrared microspectroscopy (IRM) and scanning electron microscopy showed that a fibril of β 2M peptide was clearly dissociated b...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Jindo, M. Nakamura, K. Okumura, H. Tsukiyama, K. Kawasaki, T. Tags: infrared free-electron laser amyloidosis amyloid fibril β 2-microglobulin research papers Source Type: research
Beamline simulations using monochromators with high d-spacing crystals
Monochromators for synchrotron radiation beamlines typically use perfect crystals for the hard X-ray regime and gratings for soft X-rays. There is an intermediate range, typically 1 – 3 keV (tender X-rays), which common perfect crystals have difficulties covering and gratings have low efficiency, although some less common crystals with high d-spacing could be suitable. To evaluate the suitability of these crystals for a particular beamline, it is useful to evaluate the crystals' performance using tools such as ray-tracing. However, simulations for double-crystal monochromators are only available for the most used cry...
Source: Journal of Synchrotron Radiation - August 12, 2022 Category: Physics Authors: Yu, X.J. Chi, X. Smulders, T. Wee, A.T.S. Rusydi, A. Sanchez del Rio, M. Breese, M.B.H. Tags: high d-spacing crystal YB66 crystal monochromators ray tracing SHADOW OASYS research papers Source Type: research
High-resolution XEOL spectroscopy setup at the X-ray absorption spectroscopy beamline P65 of PETRA III
A newly designed setup to perform steady-state X-ray excited optical luminescence (XEOL) spectroscopy and simultaneous XEOL and X-ray absorption spectroscopy characterization at beamline P65 of PETRA III is described. The XEOL setup is equipped with a He-flow cryostat and state-of-the-art optical detection system, which covers a wide wavelength range of 300 – 1700 nm with a high spectral resolution of 0.4 nm. To demonstrate the setup functioning, low-temperature XEOL studies on polycrystalline CuInSe2 thin film, single-crystalline GaN thin film and single-crystalline ZnO bulk semiconductor samples are performed. ...
Source: Journal of Synchrotron Radiation - August 11, 2022 Category: Physics Authors: Levcenko, S. Biller, R. Pfeiffelmann, T. Ritter, K. Falk, H.H. Wang, T. Siebentritt, S. Welter, E. Schnohr, C.S. Tags: XEOL XAS CuInSe2 ZnO GaN research papers Source Type: research
Improved precision in As speciation analysis with HERFD-XANES at the As K-edge: the case of As speciation in mine waste
In this study, linear combination fitting (LCF) was performed on synthetic spectra generated from mixtures of eight measured reference compounds for both HERFD-XANES and transmission-detected XANES to evaluate the improvement in quantitative speciation with HERFD-XANES spectra. The reference compounds arsenolite (As2O3), orpiment (As2S3), getchellite (AsSbS3), arsenopyrite (FeAsS), ka ň kite (FeAsO4 · 3.5H2O), scorodite (FeAsO4 · 2H2O), sodium arsenate (Na3AsO4), and realgar (As4S4) were selected for their importance in mine waste systems. Statistical methods of principal component analysis and target transformation wer...
Source: Journal of Synchrotron Radiation - August 11, 2022 Category: Physics Authors: Saurette, E.M. Frinfrock, Y.Z. Verbuyst, B. Blowes, D.W. McBeth, J.M. Ptacek, C.J. Tags: HERFD-XANES geochemistry mine waste arsenic linear combination fitting research papers Source Type: research
