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CPP: Chemische Physik und Polymerphysik
CPP 4: New Experimental Techniques
CPP 4.7: Talk
Monday, March 27, 2006, 16:00–16:15, ZEU Lich
High resolution setups at BW4 - from microfocus to USAXS — •Stephan V. Roth, Ralph Döhrmann, Martin Dommach, Christian Schroer, Marion Kuhlmann, and Rainer Gehrke — HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg
The wiggler beamline BW4 at HASYLAB is dedicated to ultra-small-angle x-ray scattering (USAXS) in material science. After ten years of successful operation major upgrading and refurbishment has been performed, starting in 2003. We describe the recent upgrade of the USAXS-camera, the available SAXS setups and the present status of BW4 on the basis of standard samples and recent experiments. In brief, the key improvements at BW4 are as follows: 1) The maximum USAXS resolution - defined by the size of the beam stop - is dmax>1µm at a sample-to-detector distance LSD= 13m. 2) In grazing incidence USAXS (GIUSAXS) the reolution has been pushed well beyond dmax>3µm. 3) A new SAXS setup using a newly designed piezo-driven portable slit is available. This allows to optimize intensity and resolution for LSD≤ 4m. 4) A new microfoucs option has been established using Beryllium compound refractive lenses. Currently a moderate microfocus of 30x17µm2 can be achieved. This new option allows for scanning applications like µSAXS and µGISAXS with the sample size reduced by two orders of magnitude.