"Diffraction et Diffusion Anomale Multilongueurs d'onde".

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 "7-circle 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 multilayers, 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.

The two interchangeable instruments, 7-circle Diffractometer and Small Angle Scattering Camera, share detectors: photomultipliers, photodiodes and a 2-d CCD camera.

A short list of results and references as well as the 2009 beamline review panel document and our last  activity report  can be consulted.

The next 2010 deadlines for proposals are  : Sept. 1st (via ESRF comitees) and Sept. 15th (for CRG beamtime).

NEW: our french review comite will now be common with SOLEIL, the proposals submission will now occur on the SUN set .

A CRG founded by CNRS and CEA
created thanks to the participation of