issue contents
January 2018 issue
PhotonDiag2017 Workshop special issue
Guest Editors: E. Plönjes, M. Zangrando and D. Cocco
facility information
photondiag2017 workshop
Free
Introductory overview to the special issue papers from the PhotonDiag2017 workshop.
Open access
The commissioning and the first year of operation of the online photoionization spectrometer OPIS at FLASH2 is reported.
Open access
A single-shot spectrometer for the tender X-ray range is presented, based on the von Hamos geometry and using elastic scattering as a fingerprint of the XFEL-produced spectrum.
Open access
The performance of a hard X-ray split-and-delay optical system with a wavefront division scheme has been investigated at SACLA.
Open access
The installation and commissioning of a pulse length diagnostic setup at FLASH based on terahertz streaking is reported.
The advent of ultra-short extreme ultraviolet (EUV) and soft X-ray free-electron laser (FEL) sources able to produce high peak brightness and sub-picosecond pulses requires novel time-domain diagnostics to provide temporal information on the emitted pulse duration. Here the successful implementation of an autocorrelation method to determine the FEL–FEL pulse duration based on an EUV transient grating is reported.
Open access
Double electron bunch lasing at an X-ray free-electron laser for temporal overlap in pump–probe experiments is presented.
A description of the novel timing methodologies developed at the FERMI FEL facility is given.
Open access
Grating configurations for compressing free-electron-laser pulses are discussed.
A review of the electron and photon diagnostics presently available on laser plasma acceleration (LPA) beamlines, and especially on those targeting FEL applications, is given. Diagnostics issues related to the special LPA environment/properties are also addressed.
Arrival timing diagnostics between soft X-ray free-electron laser and synchronized optical laser pulses were performed at SACLA BL1.
Open access
Laser power meters are being developed as a compact X-ray power diagnostic for LCLS-II and are characterized for their responsivity, linearity and vacuum compatibility. The power meters are calibrated against X-ray photodiodes and a gas monitor detector.
Open access
An experimental study of the durability of extreme UV optical coatings to a large number of free-electron laser pulses is reported.
Open access
The damage threshold of diffraction gratings and X-ray coatings have been studied using X-ray FEL radiation.
Open access
Establishing a facility for the production of gratings for synchrotron and free-electron laser applications is reported.
Open access
An efficient high-order suppression system has been developed and included in the optics beamline in BESSY-II synchrotron sources. The design of the instrument and its performance in suppressing high-order diffraction from the monochromator grating are described in this paper.
Open access
The recovery of wavefront distortions over multiple compound refractive optics was used to model and correct aberrations of similar individual Be lenses for different X-ray energies and focal lengths.
Open access
Boron carbide and platinum are two suitable coating materials for X-ray mirrors at free-electron lasers worldwide. The achieved thickness uniformity for boron carbide is less than 1 nm peak-to-valley over 1500 mm mirror length.
Open access
A method to obtain the deformation profile to be imparted to an X-ray mirror in order to turn a Gaussian intensity distribution into any assigned point spread function, and how to easily check the result using physical optics.
Open access
The preliminary design of a monochromatic beamline for FLASH2 at DESY is discussed.
Open access
Investigations of the diffraction gratings for the high-resolution XUV Raman spectrometer at FLASH via both ex situ and in situ metrology and ray tracing.
Open access
Direct experimental observation of the gas density depression effect by performing an X-ray-pump/X-ray-probe measurement using a two-bunch X-ray FEL beam is presented.
topical reviews
In situ or in operando electrochemical synchrotron radiation measurement provides high impact information on studies of bulk materials and the interface in a lithium ion battery. The key compound of the measurements is the in situ or in operando spectroelectrochemical cell.
research papers
Transient thermal stress wave and vibrational analyses of energy transfer mechanisms and structural dynamics in a thin diamond crystal under X-ray FEL operation are presented.
Intensity monitors for high-intensity X-ray pulses based on diamond plates with beryllium and graphite electrodes are presented.
A broad overview of the various analytical capabilities, intrinsic features and performance figures of the IAEA X-ray spectrometry endstation operated at the X-ray Fluorescence beamline of Elettra Sincrotrone Trieste is given, and different applications are demonstrated to familiarize the user community with the applicable intersdisciplinary research.
A method for rapid measurement of X-ray reflectivity using an area detector and a monochromatic X-ray beam, combined with a continuous data acquisition mode during the angular movements of the sample and detector, is described.
Download citation
Download citation
High-resolution powder X-ray diffraction is a powerful technique that can be used to obtain reliable structural parameters on highly crystalline minerals including samples with highly absorbing atoms such as lead.
The X-ray natural circular dichroism of langasite crystal La3Ga5SiO14 near the Ga K-edge is described in terms of the gyration tensor formalism. The experimental spectra are compared with the results of ab initio calculations that, for the first time, have allowed one to disentangle the contributions from Ga atoms in different Wyckoff positions.
Open access
A study of the effect of reflection and refraction processes on the evolution of the total-electron-yield spectrum over a wide range of incidence angles including grazing angles is reported.
A two-block Fresnel zone plate X-ray Fourier transform holography scheme is proposed and investigated.
Here, fast Radon operators are used in incremental algorithms for maximum-likelihood transmission tomographic image reconstruction. The resulting methods present fast convergence and low per-iteration computational cost without compromising reconstruction accuracy. Application to synchrotron illuminated tomographic imaging is illustrated with both synthetic and real data.
This work presents the performance of a 2 mm-thick CZT pixel detector, with pixel pitches of 500 and 250 µm coupled to a custom 16-channel digital readout electronics, performing on-line fast pulse shape and height analysis. Charge-sharing investigations were performed, at both low and high fluxes, using fine time coincidence analysis and pulse shape analysis.
This paper proposes a separation method for images composed of the superposition of a steady background and several foreground patterns with different subpixel motions. Application to the correction of X-ray radiographs allows moving particles that pollute the reconstruction to be erased.
beamlines
Open access
The status of a soft X-ray free-electron laser beamline at SACLA is reported.
Open access
Microfocusing of hard X-ray free-electron laser pulses using Kirkpatrick–Baez mirrors at the nano-crystallography and coherent imaging hutch of the Pohang Accelerator Laboratory X-ray Free-Electron Laser facility is reported.
computer programs
Open access
The implementation of DA+ data acquisition and analysis software at Swiss Light Source macromolecular crystallography beamlines is presented. Detailed descriptions of the user interface, acquisition engine, online processing and database, which are the major components of DA+, are given.