May 2019 issue
J. Synchrotron Rad. (2019). 26, 607-618
Synchrotron radiation micro-tomography for high-resolution neurovascular network morphology investigation
This review focuses on recent progress in synchrotron radiation methodology and its application in probing neurovascular networks, especially the pathological changes associated with vascular abnormalities in various model systems.
J. Synchrotron Rad. (2019). 26, 619-628
On-line monitoring of the spatial properties of hard X-ray free-electron lasers based on a grating splitter
The feasibility of on-line monitoring of the spatial properties (including intensity distribution, coherence and wavefront profile) of a hard XFEL beam using a grating splitter is presented.
J. Synchrotron Rad. (2019). 26, 629-634
An instrument for photon-in photon-out spectroscopy at XFELs in the energy range between soft and hard X-rays is presented.
J. Synchrotron Rad. (2019). 26, 635-646
High peak power and high brightness hard X-ray generation achievable in the double-bunch LCLS-II operation is reported.
J. Synchrotron Rad. (2019). 26, 647-652
Development and evaluation of a spatial and temporal determination diagnostic for X-ray free-electron lasers.
J. Synchrotron Rad. (2019). 26, 653-659
The development of novel single-particle imaging injection instrumentation at the European XFEL beamline SPB/SFX is presented.
J. Synchrotron Rad. (2019). 26, 660-676
The Single Particles, Clusters and Biomolecules and Serial Femtosecond Crystallography instrument of the European XFEL: initial installation
An introduction to the early operational capabilities of the Single Particles, Clusters and Biomolecules and Serial Femtosecond Crystallography (SPB/SFX) scientific instrument at the European X-ray Free Electron Laser facility is presented.
J. Synchrotron Rad. (2019). 26, 677-684
Angular dispersion enhanced prebunch for seeding ultrashort and coherent EUV and soft X-ray free-electron laser in storage rings
A novel technique is proposed which uses angular dispersion to enhance the high-harmonic bunching of the electron beam for generating ultrashort and coherent extreme-ultraviolet and soft X-ray free-electron laser pulses in storage rings.
J. Synchrotron Rad. (2019). 26, 685-691
Techniques developed at LCLS to make optical laser pump–X-ray probe experiments both robust and easy to implement at ultrafast X-ray free-electron lasers are presented.
J. Synchrotron Rad. (2019). 26, 692-699
The beam transport system of the European XFEL SASE1 beamline is described together with experiences gained during the first user runs.
J. Synchrotron Rad. (2019). 26, 700-707
A range of THz diagnostic tools developed for THz/XUV pump–probe experiments at FLASH1, DESY, are presented.
J. Synchrotron Rad. (2019). 26, 708-713
Characterizing transmissive diamond gratings as beam splitters for the hard X-ray single-shot spectrometer of the European XFEL
Grating structures with 150 nm pitches were fabricated on free-standing CVD diamond membranes supported by a silicon frame. The efficiencies and structural homogeneity of the gratings were measured with synchrotron X-rays at different photon energies.
J. Synchrotron Rad. (2019). 26, 714-719
Full-field X-ray microscopy with a resolution of 100 nm, achieved by polymer compound 3D refractive nano-lenses, is demonstrated. This article also dicusses issues related to lens aberrations, astigmatism and radiation stability, and thus ways of improving the lens further are considered.
J. Synchrotron Rad. (2019). 26, 720-728
The structure, stress and optical properties of Cr/C multilayers with the same period (about 11.64 nm) and bi-layer number (20) but with different Cr thickness ratio (0.20–0.80) are discussed. An optimal Cr thickness ratio of 0.37 is defined in view of high reflectivity and low stress.
J. Synchrotron Rad. (2019). 26, 729-736
An iterative global optimization method is developed to enable piezoelectric deformable mirrors to effectively approach a target figure or realize phase compensation based on in situ or ex situ metrologies.
J. Synchrotron Rad. (2019). 26, 737-749
The large dispersion in undulators tuned at resonance in the THz range can be responsible for a change in the electron beam form factor in the case of the presence of energy chirp, leading to enhancement or suppression of superradiant THz emission.
J. Synchrotron Rad. (2019). 26, 750-755
A middle energy-bandwidth X-ray monochromator for high-flux synchrotron diffraction: revisiting asymmetrically cut silicon crystals
Using an asymmetric diffraction geometry, a silicon double-crystal monochromator can produce a higher photon flux than the standard symmetric geometry for low-emittance synchrotron radiation X-rays, while the outgoing beam from the monochromator maintains its narrow angular spread. These features are well suited to synchrotron diffraction and scattering.
J. Synchrotron Rad. (2019). 26, 756-761
A Fresnel-mirror-based optical system was constructed to determine the degree of spatial coherence at the soft X-ray beamline of SPring-8. The spatial coherence properties in the horizontal and vertical directions were measured with a transverse range of larger than 1 mm.
J. Synchrotron Rad. (2019). 26, 762-773
A statistical approach to correct X-ray response non-uniformity in microstrip detectors for high-accuracy and high-resolution total-scattering measurements
A statistical approach to correct X-ray response non-uniformity in microstrip detectors was developed and applied to a detector system, which enabled high-accuracy and high-resolution total scattering measurements in a wide range of scattering vector.
J. Synchrotron Rad. (2019). 26, 774-784
A detailed kinetic and mechanistic study of the hydration of CaSO4·0.5H2O to CaSO4·2H2O is reported. This is a one-step process with no crystalline intermediate phases, and the addition of increasing amounts of CaSO4·2H2O reduces the importance of nucleation in controlling the reaction rate.
J. Synchrotron Rad. (2019). 26, 785-792
Design and performance of a new setup for spatially resolved transmission X-ray photoelectron spectroscopy at the Swiss Light Source
The design and development of a photoelectron spectromicroscope working in transmission mode are presented.
J. Synchrotron Rad. (2019). 26, 793-800
W/B4C multilayer structures are characterized using various experimental techniques. The influence of B4C layer thickness on the optical performance near the B K-edge is discussed.
J. Synchrotron Rad. (2019). 26, 801-810
A new cell is demonstrated that has been designed and tested to perform in situ X-ray absorption, diffuse reflectance IR Fourier transform and mass spectroscopies. It is possible to perform X-ray absorption spectroscopy measurements in transmission or fluorescence modes. The best configuration can be adjusted depending on the specific requirements of the experiment, and the cell is compatible with external devices like UV-light and Raman probes.
J. Synchrotron Rad. (2019). 26, 811-818
Nature of cobalt species during the in situ sulfurization of Co(Ni)Mo/Al2O3 hydrodesulfurization catalysts
From 1s X-ray absorption and 1s3p resonant inelastic X-ray scattering, the valence, coordination and symmetry of cobalt ions were tracked in two cobalt-promoted molybdenum oxide precursors of the hydrodesulfurization catalyst system.
J. Synchrotron Rad. (2019). 26, 819-824
Time-resolved X-ray reflection phases of the nearly forbidden Si(222) reflection under laser excitation
Time-resolved X-ray reflection phases of the nearly forbidden Si(222) reflection under laser excitation are investigated using multiple-wave diffraction at 7.82 keV. A relative phase change of around 4° of Si(222) in the first 100 ps of laser excitation and its gradual recovery over several nanoseconds are observed.
J. Synchrotron Rad. (2019). 26, 825-838
A method for fast three-dimensional reconstruction of multi-material objects based on propagation-based X-ray phase-contrast tomography with phase retrieval using the homogeneous form of the transport of intensity equation is presented.
J. Synchrotron Rad. (2019). 26, 839-853
A convolutional neural network for fast upsampling of undersampled tomograms in X-ray CT time-series using a representative highly sampled tomogram
A convolutional neural network has been designed to quickly and accurately upscale the sinograms of X-ray tomograms captured with a low number of projections, effectively increasing the number of projections. This is particularly useful for tomograms that are part of a time-series as, in order to capture fast-occurring temporal events, tomograms have to be collected quickly, requiring a low number of projections. The upscaling process is facilitated using a single tomogram with a high number of projections for training, which is usually captured at the end or the beginning of the time-series when capturing the tomogram quickly is no longer needed.
J. Synchrotron Rad. (2019). 26, 854-867
The instrumentation and commissioning results of the reaction microscope endstation at FLASH2 are reported.
J. Synchrotron Rad. (2019). 26, 868-873
Laser systems for time-resolved experiments at the Pohang Accelerator Laboratory X-ray Free-Electron Laser beamlines
The experimental lasers at the PAL-XFEL beamlines, from the source to the sample position, are described.
J. Synchrotron Rad. (2019). 26, 874-886
Experimental station Bernina at SwissFEL: condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods
The Bernina instrument at SwissFEL Aramis employs laser-pump and X-ray-probe techniques to selectively excite and probe the electronic, magnetic and structural dynamics in condensed matter systems on the femtosecond time scale and under extreme conditions.
J. Synchrotron Rad. (2019). 26, 887-890
Arrival timing diagnostics between a soft X-ray free-electron laser and synchronized optical laser pulses were performed at SACLA BL1.
J. Synchrotron Rad. (2019). 26, 891-898
For three undulator technologies – in-vacuum, cryogenic and superconducting – the optimal parameter space for an X-ray free-electron laser is examined in the self-amplified spontaneous emission operation mode.
J. Synchrotron Rad. (2019). 26, 899-905
Wavefront-propagation simulations supporting the design of a time-delay compensating monochromator beamline at FLASH2
The new monochromator beamline at FLASH, the free-electron laser of Hamburg, is designed to work in the soft X-ray range, covering a spectral range from 1 to 20 nm and with a spectral resolution of approximately 2000. Wave-propagation simulations were performed to provide the design of this beamline further insights with respect to the optical quality required.
addenda and errata
J. Synchrotron Rad. (2019). 26, 906
The list of authors in the paper by Juranić et al. (2018>) [J. Synchrotron Rad. 25, 1238–1248] is corrected.