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