Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 80, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3104186
Keywords
beryllium compounds; lenses; mirrors; optical focusing; X-ray monochromators; X-ray scattering
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At BW4 at HASYLAB a beryllium compound refractive lens (Be-CRL) is used for the focusing in small-angle x-ray scattering experiments. Using it provides the advantages of higher long-term stability and a much easier alignment compared to a setup with focusing mirrors. In our investigations presented here, we show the advantages of using a Be-CRL in small-angle and also ultra small-angle x-ray scattering. We investigated the beam characteristics at the sample position with respect to spot size and photon flux. The spot size is comparable to that of a setup with focusing mirrors but with a gain in flux and better long-term stability. It is also shown that plane mirrors are still necessary to suppress higher order energies passing the monochromator.
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