Design and characterization of an undulator beamline optimized for small-angle coherent X-ray scattering at the Advanced Photon Source

The design of an undulator beamline at the Advanced Photon Source optimized for performing coherent small-angle X-ray scattering is described. The beamline has been characterized by measuring and analysing static speckle patterns from isotropically disordered samples. The measured speckle widths and amplitudes are compared with a theory described herein and found to be in good agreement with its predictions.