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...Differential phase contrast with a segmented detector in a scanning X-ray microprobe- May 8, 2008 Scanning X-ray microprobes are unique tools for the nanoscale investigation of specimens from the life, environmental, materials and other fields of sciences. Typically they utilize absorption and fluorescence as contrast mechanisms. Phase contrast is a complementary technique that can provide strong contrast with reduced radiation dose for weakly absorbing structures in the multi-keV range. In this paper the development of a segmented charge-integrating silicon detector which provides...http://scripts.iucr.org/cgi-bin/paper?pm5022 High-resolution angular beam stability monitoring at a nanofocusing beamline- May 8, 2008 Two semi-transparent imaging beam-position monitors developed at the ESRF have been installed at the micro-analysis beamline ID22 for monitoring the angular stability of the X-ray beam. This system allows low-frequency (10Hz) angular beam stability measurements at a submicroradian range. It is demonstrated that the incoming macro-beam angular fluctuations are one of the major sources of focal spot instabilities downstream of the KirkpatrickBaez mirrors. It is also shown that scanning the energy.http://scripts.iucr.org/cgi-bin/paper?ie5019 Measurement of underground motion at the SSRF site- May 8, 2008 For the Shanghai Synchrotron Radiation Facility (SSRF) and future Shanghai Free-Electron Laser projects, ground vibration is an important factor and, in order to attenuate it, the construction of a deep tunnel is under consideration. This paper concentrates on the investigation of ground vibration at different underground levels down to 60m below surface, in order to understand the effect of vibration attenuation with depth. The effect of traffic is also studied using a 10ton truck, with ground.http://scripts.iucr.org/cgi-bin/paper?ia5025 Optimization of a BonseHart instrument by suppressing surface parasitic scattering- May 8, 2008 An improved crystal design for a BonseHart ultra-small-angle scattering instrument is presented. Defects at the diffracting surfaces of the conditioning crystals were found to be at the origin of diffuse scattering that enhances the intensity in the wings of the rocking curves by several orders of magnitude. In order to improve the performance of the instrument, the monolithic channel-cut crystals were replaced by pairs of separate polished and deeply etched crystals. These crystals were...http://scripts.iucr.org/cgi-bin/paper?gf5009 X-ray photon correlation spectroscopy under flow- May 8, 2008 X-ray photon correlation spectroscopy was used to probe the diffusive dynamics of colloidal particles in a shear flow. Combining X-ray techniques with microfluidics is an experimental strategy that reduces the risk of X-ray-induced beam damage and also allows time-resolved studies of processes taking place in flow cells. The experimental results and theoretical predictions presented here show that in the low shear limit for a transverse flow' scattering geometry (scattering wavevector q...http://scripts.iucr.org/cgi-bin/paper?ot5581 Element-specific microtomographic imaging of Drosophila brain stained with high-Z probes- May 8, 2008 An application of X-ray microtomography to the Drosophila adult brain stained with colloidal gold and a platinum compound is described. The transparency of biological tissue to hard X-rays enables tomographic visualization of the three-dimensional structure of tissue entrails. Each high-Z element was visualized as a three-dimensional structure from the difference absorption coefficient image at the corresponding LIII absorption edge. The cortex of the optic lobe was selectively visualized by...http://scripts.iucr.org/cgi-bin/paper?ia5026 |