Ministère de la Culture et de la Communication
Université Versailles Saint-Quentin


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The PUMA beamline

par Sebastian Schöder - publié le , mis à jour le

The new beamline PUMA (French : "Photons Utilisés pour les Matériaux Anciens" - photons used for ancient materials), which is currently under construction, will have two end stations : One for hard X-ray spectro-microscopy (2D raster imaging and spot analysis) and a second one for hard X-ray micro-tomography (3D imaging). These methods are the most demanded hard X-ray techniques for the analysis of ancient materials.

Both end stations will target a micrometric resolution and will be optimized to minimize dead time between collections and to allow the analysis of large amounts of samples.

Like for the rest of IPANEMA, PUMA has been defined through a large campaign of collective work, in particular through the workshop "A beamline for ancient materials at SOLEIL" that was held in may 2009.

On this basis, and taking into account the many recommendations of the scientific community, the construction of the beamline started in spring 2012 and will open its doors for the users in 2015.

On the longer term, a second experimental station will be built in a new satellite building, which will improve the optical parameters of PUMA even more. This new end station will be highly automatized with a sample-changing robot for autonomous analysis of large sample sets.

Technical specifications

PUMA is a hard X-ray beamline using photon energies between 4 and 60 keV. A double crystal monochromator (DCM) will be used to select the wavelength.

Full field experiments will be possible with the white or monochromatic beam, giving a field of view of up to 10 mm (vertical) x 20 mm (horizontal). The horizontal coherence length of the beam can be matched to the vertical one with a set of slits. This is an important feature for phase contrast experiments.

A Kirkpatrick-Baez (KB) mirror system can focalize the beam into a 3 µm x 3 µm spot on the sample. X-ray absorption (XAS) and fluorescence (XRF) spectroscopy and diffraction (XRD) and small angle scattering (SAXS) experiments will be possible.