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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments
CPP 7.23: Poster
Montag, 26. März 2007, 16:00–18:00, Poster B
Focusing-mirror ultra-small-angle neutron scattering (USANS) instrument of Research Centre Jülich at FRM-2 Reactor — Emmanuel Kentzinger1, •Aurel Radulescu1,2, Alexander Ioffe1,2, Peter-Paul Stronciwilk1,2, Jörg Stellbrink1, Dietmar Schwahn1, Thomas Brückel1,2, and Dieter Richter1,2 — 1Institute for Solid State Research, Research Centre Jülich, 52425 Jülich, Germany — 2Jülich Centre for Neutron Sciences (JCNS), Research Centre Jülich, 52425 Jülich, Germany
Biological, colloidal and macromolecular samples presenting characteristic length scales from nanometer up to micron-scale are usually investigated by combining USANS at double-crystal diffractometers (DCD) and SANS at conventional pinhole cameras. In principle, the Q-range of both classes of instruments overlaps but the required instrumental settings push both techniques to their limits, mainly due to signal-to-noise level and the reduced flux at sample position. The KWS3 USANS instrument of Research Centre Jülich is the worldwide unique instrument running on the principle of a one-to-one image of an entrance aperture on a two-dimensional position sensitive detector by neutron reflection from a double-focusing toroidal mirror. The instrument is just relocated at the FRM-2 reactor in Garching where it will permit to perform SANS studies within a Q-range between 4x10−5 and 10−3 Å−1 with considerable advantages over the DCD and conventional SANS instruments. The working principle and recent use of KWS3 in investigations of multiscale aggregates formed by poly(ethylene-butene) random copolymers in solution are reported.