Physics – Condensed Matter
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phyb..276...52a&link_type=abstract
Physica B: Physics of Condensed Matter, Volume 276, p. 52-54.
Physics
Condensed Matter
1
Scientific paper
Presently high-resolution instruments for small-angle neutron scattering use the conventional pinhole collimation. For high resolution these instruments have to be extremely long (80m for D11). Much shorter instruments with high resolution and better intensity can be built with focusing mirrors. The high-quality mirrors, which were developed for the X-ray telescope ROSAT, served as prototypes for our neutron imaging mirrors. Recently we succeeded in building a 20m long focusing instrument at the ILL in Grenoble. The image has a very low parasitic halo. Aberrations are mainly due to gravity. Test experiments on polymeric precipitates down to /Q=4×10-4Å-1 were successfully carried out. In Jülich we now are building a focusing SANS-instrument and reflectometer with major geometrical improvements of the mirror design. For the SANS-instrument, a /Q-range down to /Q~10-4Å-1 is expected. For the reflectometer, a perpendicular Q⊥-range between 10-2Å-1
Alefeld B.
Brückel Th
Dohmen L.
Richter Dieter
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