High-brilliance Beamline at the European Synchrotron Radiation Facilitya)

Abstract

The High‐brilliance Beamline at the European Synchrotron Radiation Facility is under commissioning. First official user experiments are scheduled for September 1994. During the last months the beamline optics has been installed and extensively tested. Currently, the two end stations, (a) for macromolecular crystallography and (b) for time‐resolved ultrasmall‐angle x‐ray scattering are under construction. This article presents the final optical setup of the beamline and describes the end stations. The actual performance of the undulator, the cryogenically cooled Si‐(111) channel‐cut monochromator, and the toroidal mirror are discussed. All results are in very good agreement with previously published theoretical calculations. Now, at the sample position a focused monochromatic beam is available between 0.15 nm (8 keV) and 0.077 nm wavelength (16 keV). At 0.1 nm wavelength the beam size is horizontally 0.38 mm and vertically 0.75 mm (full width at half‐maximum) with a photon flux density of 2.5×107 photons/s/μm2 (±30%).