A dedicated in-vacuum X-ray detector based on the hybrid pixel PILATUS 1M
detector has been installed at the four-crystal monochromator beamline of PTB
at the electron storage ring BESSY II in Berlin. Due to its windowless
operation, the detector can be used in the entire photon energy range of the
beamline from 10 keV down to 1.75 keV for small-angle X-ray scattering (SAXS)
experiments and anomalous SAXS (ASAXS) at absorption edges of light elements.
The radiometric and geometric properties of the detector like quantum
efficiency, pixel pitch and module alignment have been determined with low
uncertainties. The first grazing incidence SAXS (GISAXS) results demonstrate
the superior resolution in momentum transfer achievable at low photon energies.Comment: accepted by Journal of Synchrotron Radiatio
