Published in

Elsevier, Physica B: Condensed Matter, (276-278), p. 52-54

DOI: 10.1016/s0921-4526(99)01323-x

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Space technology from X-ray telescopes for focusing SANS and reflectometry

Journal article published in 2000 by B. Alefeld, L. Dohmen, D. Richter, Th Brückel ORCID
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Presently high-resolution instruments for small-angle neutron scattering use the conventional pinhole collimation. For high resolution these instruments have to be extremely long (80 m 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 20 m 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=4×10−4 Å−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≈10−4 Å−1 is expected. For the reflectometer, a perpendicular Q⊥-range between 10−2 Å−1<Q⊥<10−1 Å−1 is envisaged, with a ΔQ⊥ resolution of about ΔQ⊥≈10−2 Å−1.