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XRD1 Beamline Description


The X-Ray Diffraction 1 (XRD1) beamline has been designed (in collaboration with the Istituto di Cristallografia - CNR) primarily for macromolecular crystallography, but the characteristics of the beamline permit to perform a wide variety of experiments: the beamline hosts small molecules, protein crystallography, powder diffraction, high pressure physics and solid-state experiments.

Insertion Device

The insertion device of the XRD1 beamline is shared and used simultaneously with the SAXS beamline. The insertion device is a hybrid multipole wiggler, composed of three sections for a total length of 4.5 m, with a fixed working gap of 22 mm and B=1.6T. The white beam resulting from the source is cut to 4 keV with a series of cooled graphite layers and is then monochromatized.

Beamline Layout

A mask determines the angular acceptance and stops unwanted radiation from the wiggler. After about 22.3 m from the source the beam is collimated in the vertical direction by means of a Pt coated cylindrical mirror with a radius of curvature of 14.8 km. At 24.5 m from the source, a Si 111 double crystal monochromator permits to select a specific energy. At 28.0 m from the source, a bendable toridal mirror, with 55 mm and 9.3 km of sagittal and tangential radius, permits to focalize the monochromatic beam with dimensions at the sample of 0.7 x 0.2 mm. Acting on the focusing mirror tilt, a rapid feedback loop using downstream 4-quadrant ionization chamber mantains the vertical position of the beam fixed.


Last Updated on Friday, 08 January 2016 16:56