issue contents

Journal logoJOURNAL OF
ISSN: 1600-5775

July 2008 issue

Highlighted illustration

Cover illustration: Schematic of a scanning X-ray microprobe with a segmented transmission detector (see Hornberger, de Jonge, Feser, Holl, Holzner, Jacobsen, Legnini, Paterson, Rehak, Strüder and Vogt, pages 355-362). Three different segmentations are shown on the left. The difference signal between opposing segments measures beam deflections and therefore phase gradients in the specimen. The bottom figures illustrate the difference between absorption contrast (total transmitted intensity) and differential phase contrast (difference of opposing segments) for a cardiac myocyte imaged at 10 keV photon energy, and a diatom imaged at 1.79 keV.

facility information

research papers

J. Synchrotron Rad. (2008). 15, 323-328
doi: 10.1107/S0909049508004524
link to html
Spatial resolution measurements at Advanced Light Source beamline 1.4.4 are used to determine the wavelengths at which a cross-over from diffraction-limited to electron-beam-source-size-limited resolution occurs. Performance is then predicted for different synchrotrons, beamline optics and endstation microscopes.

J. Synchrotron Rad. (2008). 15, 329-334
doi: 10.1107/S0909049508006638
link to html
An in situ synchrotron X-ray imaging technique for visualizing the water in a polymer electrolyte fuel cell has been developed. The technique is very effective and useful for studying water management in a polymer electrolyte fuel cell.

J. Synchrotron Rad. (2008). 15, 335-340
doi: 10.1107/S0909049508008418
link to html
The radiation properties of two classes of insertion devices, a long-period wiggler and a short-period undulator, are calculated and compared, using different computer codes. Special care is found to be needed when modeling these properties.

J. Synchrotron Rad. (2008). 15, 341-349
doi: 10.1107/S0909049508008960
link to html
An optimized crystal design for a low-background Bonse–Hart camera for small-angle X-ray scattering is presented. Details about achieving the best surface quality of the crystals are described giving also perspectives for further applications in X-ray optics.

J. Synchrotron Rad. (2008). 15, 350-354
doi: 10.1107/S0909049508003695
link to html
Research on underground motion at the SSRF site with and without a heavy truck is reported.

J. Synchrotron Rad. (2008). 15, 355-362
doi: 10.1107/S0909049508008509
link to html
A segmented transmission detector has been developed and installed at sector 2 instruments at the Advanced Photon Source for differential phase-contrast imaging in parallel with absorption and fluorescence measurements.

J. Synchrotron Rad. (2008). 15, 363-370
doi: 10.1107/S0909049508011370
link to html
A three-dimensional structured scintillator capable of 1 µm resolution has been characterized with Monte Carlo simulations for 30–200 keV X-rays with a factor of 5–15 gain in efficiency over unstructured scintillators.

J. Synchrotron Rad. (2008). 15, 371-373
doi: 10.1107/S0909049508007607
link to html
X-ray transmission mirrors, which function as high-pass energy filters, have been made out of silicon nitride and tested in synchrotron X-ray beams. The high-energy cut-off can be selected by adjusting the incidence angle of the transmission mirror.

J. Synchrotron Rad. (2008). 15, 374-377
doi: 10.1107/S0909049508003725
link to html
Element-specific microtomographic analysis of the central nervous system of adult Drosophila melanogaster stained with gold and platinum probes has revealed the nerve tissue structure responsible for biological functions.

J. Synchrotron Rad. (2008). 15, 378-384
doi: 10.1107/S0909049508006420
link to html
X-ray photon correlation spectroscopy was performed on a colloidal suspension of hard spheres under shear flow. This study describes a new experimental method that can be used to avoid X-ray-induced beam damage while measuring `internal' mesoscale dynamics in soft-matter or biological systems.

J. Synchrotron Rad. (2008). 15, 385-391
doi: 10.1107/S090904950800650X
link to html
The SSRF R&D magnet girder assemblies are structure optimized. Vibration measurements have been performed to investigate the mechanical stability and influence of cooling water on magnet vibration.

J. Synchrotron Rad. (2008). 15, 392-398
doi: 10.1107/S0909049508007486
link to html
Two semi-transparent X-ray beam-position monitors have been developed to study the submicroradian angular stability of the X-ray beam at a nanofocusing beamline.

J. Synchrotron Rad. (2008). 15, 399-410
doi: 10.1107/S0909049508003658
link to html
The groove-function dependence of the wavefront aberration coefficients of gratings is reported.

J. Synchrotron Rad. (2008). 15, 411-413
doi: 10.1107/S0909049508013010
link to html
X-ray kinoform lenses of the clessidra type, which are composed of many small triangular prisms, can be used under suitable conditions effectively as arrays of refractive micro-lenses. These arrays can provide relatively large apertures in long-focal-length focusing.

J. Synchrotron Rad. (2008). 15, 414-419
doi: 10.1107/S0909049508003944
link to html
A vacuum-compatible portable chamber, optimized for working in a middle-pressure regime and adaptable to UHV conditions, is presented. Its compact design and its modularity are highlighted. These characteristics make it a very versatile piece of equipment, useful for in situ X-ray scattering studies of various systems under different conditions.

short communications

J. Synchrotron Rad. (2008). 15, 420-422
doi: 10.1107/S0909049508009606
link to html
Radiation damage by heating of samples at high-flux synchrotron radiation circular dichroism spectroscopy beamlines can result in protein denaturation. This study compares the degree of damage that occurs at a number of beamlines worldwide in order to define the threshold beam flux density above which significant denaturation occurs.

current events

J. Synchrotron Rad. (2008). 15, 423-424
doi: 10.1107/S0909049508017330
Follow J. Synchrotron Rad.
Sign up for e-alerts
Follow J. Synchrotron Rad. on Twitter
Follow us on facebook
Sign up for RSS feeds