Journal of Synchrotron RadiationSynchrotron radiation sources and their associated technologies have expanded at an extremely rapid rate during the past 20 years. Through the 1990s, many new synchrotron radiation sources have been constructed and exploited worldwide. The Journal of Synchrotron Radiation aims to provide a focus in this rapidly expanding area. The topics covered by the journal include source technology, instrumentation and techniques over all the spectral ranges relevant to synchrotron radiation research. It...A high-spatial-resolution three-dimensional detector array for 30200keV X-rays based on structured scintillators- May 15, 2008 A three-dimensional X-ray detector for imaging 30200keV photons is described. It comprises a set of semi-transparent structured scintillators, where each scintillator is a regular array of waveguides in silicon, and with pores filled with CsI. The performance of the detector is described theoretically and explored in detail through simulations. Based on available hardware, a spatial resolution of 1m is obtainable. The resolution of a single screen is shown to be determined only by the pitch, at.http://scripts.iucr.org/cgi-bin/paper?pm5023 On the use of clessidra prism arrays in long-focal-length X-ray focusing- May 15, 2008 Clessidra (hour-glass) X-ray lenses have an overall shape of an old hour glass, in which two opposing larger triangular prisms are formed of smaller identical prisms or prism-like objects. In these lenses, absorbing and otherwise optically inactive material was removed with a material-removal strategy similar to that used by Fresnel in the lighthouse lens construction. It is verified that when the single prism rows are incoherently illuminated they can be operated as independent micro-lenses...http://scripts.iucr.org/cgi-bin/paper?wl5148 Light flux density threshold at which protein denaturation is induced by synchrotron radiation circular dichroism beamlines- May 8, 2008 New high-flux synchrotron radiation circular dichroism (SRCD) beamlines are providing important information for structural biology, but can potentially cause denaturation of the protein samples under investigation. This effect has been studied at the new CD1 dedicated SRCD beamline at ISA in Denmark, where radiation-induced thermal damage effects were observed, depending not only on the radiation flux but also on the focal spot size of the light. Comparisons with similar studies at other SRCD...http://scripts.iucr.org/cgi-bin/paper?ms5006 Silicon nitride transmission X-ray mirrors- May 8, 2008 Transmission X-ray mirrors have been fabricated from 300400nm-thick low-stress silicon nitride windows of size 0.6mm 85mm. The windows act as a high-pass energy filter at grazing incidence in an X-ray beam for the beam transmitted through the window. The energy cut-off can be selected by adjusting the incidence angle of the transmission mirror, because the energy cut-off is a function of the angle of the window with respect to the beam. With the transmission mirror at the target angle of 0.22,.http://scripts.iucr.org/cgi-bin/paper?ie5020 In situ observation of water distribution and behaviour in a polymer electrolyte fuel cell by synchrotron X-ray imaging- May 8, 2008 In situ visualization of the distribution and behaviour of water in a polymer electrolyte fuel cell during power generation has been demonstrated using a synchrotron X-ray imaging technique. Images were recorded using a CCD detector combined with a scintillator (Gd2O2S:Tb) and relay lens system, which were placed at 2.0m or 2.5m from the fuel cell. The images were measured continuously before and during power generation, and data on cell performance was recorded. The change of water...http://scripts.iucr.org/cgi-bin/paper?pm5020 Aberration theory of plane-symmetric grating systems- May 8, 2008 Aberration theory of plane-symmetric optical systems of mirror and grating has been developed based on the wavefront aberration method. A toroidal reference wavefront surface is used to define the wavefront aberration. Based on the ray geometry, the coordinate mapping relationships of the ray between the optical element and the incident and aberrated wavefronts are derived using a polynomial-fit method; this enables the resultant coefficients of the wavefront and the transverse aberration to be.http://scripts.iucr.org/cgi-bin/paper?pm5018 Comparison of calculated brightness and flux of radiation from a long-period wiggler and a short-period undulator- May 8, 2008 In this article the calculation of brightness and flux for two insertion devices of the 2.8GeV X-ray storage ring at the NSLS is discussed. The radiation properties from the X25 linearly polarized wiggler and the new X25 short-period undulator are compared at a fixed photon energy (11.3keV) corresponding to emission from the fifth harmonic of the short-period undulator. For this computation, three commonly available synchrotron radiation programs are used. The capabilities of each of these...http://scripts.iucr.org/cgi-bin/paper?kv0002 Mechanical stability of the magnet girder assembly at the SSRF- May 8, 2008 Electron beam stability is very important for third-generation light sources, especially for the Shanghai Synchrotron Radiation Facility (SSRF), whose ground vibration is much larger than other light sources. The mechanical stability of the magnet girder assemblies (MGAs) in a storage ring is essential for electron beam stability and performance. In order to improve the mechanical stability of the R&D MGAs in the storage ring of the SSRF, the number of MGAs in each lattice cell has been...http://scripts.iucr.org/cgi-bin/paper?wr5008 Versatile vacuum chamber for in situ surface X-ray scattering studies- May 8, 2008 A compact portable vacuum-compatible chamber designed for surface X-ray scattering measurements on beamline ID01 of the European Synchrotron Radiation Facility, Grenoble, is described. The chamber is versatile and can be used for in situ investigation of various systems, such as surfaces, nanostructures, thin films etc., using a variety of X-ray-based techniques such as reflectivity, grazing-incidence small-angle scattering and diffraction. It has been conceived for the study of morphology and..http://scripts.iucr.org/cgi-bin/paper?kv5046 Spatial resolution limits for synchrotron-based spectromicroscopy in the mid- and near-infrared- May 8, 2008 Spatial resolution tests were performed on beamline 1.4.4 at the Advanced Light Source in Berkeley, CA, USA, a third-generation synchrotron light source. This beamline couples the high-brightness synchrotron source to a Thermo-Electron Continum XL infrared microscope. Two types of resolution tests were performed in both the mid-IR and near-IR. The results are compared with a diffraction-limited spot size theory. At shorter near-IR wavelengths the experimental results begin to deviate from...http://scripts.iucr.org/cgi-bin/paper?kv5047 |