Abstract
An X-ray diffractometer for small-angle scattering and diffraction experiments using synchroton radiation is described. The diffractometer is in operation at the Adone storage ring at Frascati. The optical collimation is 8 × 10 −5 rad. A three-dimensional goniometer carriers either a two-dimensional position-sensitive drift chamber detector or a one-dimensional cylindrical drift chamber. The detectors can move along a spherical surface with radius 500 mm within an arc of 0.35 rad. The best angular resolution of the diffractometer, determined by the best resolution of the detector, is 2 × 10 –4 rad.
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