Techniques Available on the SAXS / WAXS Beamline
The SAXS Beamline is optimised for transmission SAXS and WAXS for a wide range of sample types. GISAXS is also supported. For detailed information on the samples and techniques supported at the bealine please also refer to the Beamline Wiki.
Endstation of the SAXS / WAXS beamline
The SAXS/WAXS beamline is a highly flexible x-ray scattering facility with purpose-built optics and a very flexible endstation and SAXS camera. Transmission SAXS and vertical dispersion WAXS are the beamline's primary roles but a bounce-down vertical focusing mirror also permits grazing incidence (GISAXS) experiments. The beamline is not well set up for full 2-D WAXS experiments although the WAXS detector does provide sufficient 2-D coverage for particle statistics and good sensitivity. A flexible sample stage supports many sample types and sample environments. Solid, powdered, gel, liquid and solution samples have been successfully run on the beamline with some temperature control available locally and considerable flexibility for mounting stages or equipment by users. Sample handling, mounting and environments on the SAXS / WAXS beamline are discussed in detail on the Samples webpage. Automated scans for a large number of samples, variable temperature or rastering around a sample are also increasingly supported on the beamline.
The beamline uses an undulator source that allows measurement at a very high flux to moderate scattering angles and a good flux at the minimum q limit or 0.0012 inverse Angstrom. Well-characterised optical alignment means that large changes of energy are rapid and straightforward and can be readily made during an experiment. For further detail please refer to the SAXS Specifications page.
An on-axis video camera (run through the areaVision software developed in-house) allows parallax-free sample viewing and alignment at all times before and during exposure. This enables precise and rapid sample alignment for high throughput and small samples. The endstation primarily uses a 1M Pilatus detector for SAXS and a 200k Pilatus detector for WAXS, providing excellent dynamic range, single photon per pixel sensitivity, low noise and and fast time resolution (30 and 150 frames per second respectively). A MAR-165 CCD camera is also available for SAXS if required. The Pilatus detectors ensure that time-resolved experiments are well supported and that large numbers of samples may be studied. Additional details on the detectors may be found on the Specifications page.