title: Small angle x-ray scattering with a beryllium compound refractive lens as focusing optic.
abstract: 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.
authors.affiliation: HASYLAB, DESY, Notkestrasse 85, 22607 Hamburg, Germany. andreas.timmann@desy.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Timmann
authors.forename: Ralph
authors.initials: R
authors.lastname: Döhrmann
authors.forename: Tom
authors.initials: T
authors.lastname: Schubert
authors.forename: Horst
authors.initials: H
authors.lastname: Schulte-Schrepping
authors.forename: Ulrich
authors.initials: U
authors.lastname: Hahn
authors.forename: Marion
authors.initials: M
authors.lastname: Kuhlmann
authors.forename: Rainer
authors.initials: R
authors.lastname: Gehrke
authors.forename: Stephan Volkher
authors.initials: SV
authors.lastname: Roth
authors.forename: Andreas
authors.initials: A
authors.lastname: Schropp
authors.forename: Christian
authors.initials: C
authors.lastname: Schroer
authors.forename: Bruno
authors.initials: B
authors.lastname: Lengeler