Abstract
An experimental station with a four-circle diffractometer combined with tunable and focusing optics was designed and constructed for x-ray crystallography using synchrotron radiation from the vertical wiggler at the Photon Factory. The optics implemented into beamline 14A comprises a double-crystal monochromator and a double-focusing mirror so as to yield high photon flux x rays tunable over wide wavelength regions. The diffractometer with its equatorial plane in the horizontal was specially fabricated for rapid and accurate measurements of x-ray diffraction intensities from macromolecular crystals, and was provided with an alignment carriage as well as computer control and measuring systems. The station has proved to be particularly useful for such applications as anomalous scattering studies of protein crystals and also EXAFS studies at high photon energies.
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