D2AM is a beamline dedicated to structural investigations using Anomalous Scattering in Materials Science, where studies near absorption edges are widely used to create an anomalous contrast between atoms and to study short or long range order, with two instruments, a "kappa diffractometer" and a "Small Angle Scattering Camera".
In order to achieve an easily adjustable wavelength near absorption edges between 5 and 25 keV, at a fixed point focus position, a symmetrical optics has been designed, installed at the output of a bending magnet. The optics consists of a two crystal monochromator with sagittal focusing (mainly Si(111) but Si(311) is available) located between two cylindrically bent mirrors in a compact arrangement, with double focusing (3:1).
The instruments are designed for elastic diffuse small and wide angle X-ray scattering for structural studies related to phase transitions, local order, defect... in: solid state crystallography (anomalous diffuse scattering in alloys, glasses and quasicrystals, DAFS studies of crystals and thin films or nanostructures, magnetism and quadrupolar order, ceramics and powders, ...), soft condensed matter (SAXS and WAXS in gels, polymers, biological compounds, ...), intermediate order: liquid crystals...This station will measure the scattering continuum (frequently of very weak intensity), then it requires a clean beam in vacuum with high flux and low divergence. The sample environment is flexible and various user-designed sample holders can be installed for in-situ experiments.GiSAXS experiments can be done using a dedicated setup on SAXS bench or using together the new Kappa Goniometer and the SAXS table.
The two interchangeable instruments, a Kappa Goniometer and Small Angle Scattering Camera, share detectors: photomultipliers, photodiodes and 2D pixel detectors as well as a CCD camera.The Kappa goniometer replaces since 2012 the previous 7-circles goniometer.
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The deadlines for proposals are :
- Feb. 15th (for CRG beamtime on the SUN set) and March 1st (via ESRF committees)
- Sept 10th (via ESRF committees) and Sept 15th (for CRG beamtime on the SUN set)
|A CRG founded by CNRS and CEA|
|created thanks to the participation of|