Development of imaging devices for X-rays
in material science (collaboration between CPPM, ESRF/DAM and SOLEIL).
The high flux and the high brightness of third generation X-ray
synchrotrons were not followed by equivalent progresses in the detector field.
The technology of hybrid pixels developed for the ATLAS high energy physics experiment at LHC offers
several key features that help to fill this gap. A hybrid pixel detector is made of a matrix of pixels in which each pixel
is assembled by bump bonding to a dedicated electronic circuit. One obtains high counting rate,
extremely high dynamic range, single
photon counting, energy selection and fast readout. This makes their use very attractive for X-ray imaging
experiments in Material Science (powder diffraction, crystallography of proteins, drug characterisation...).
A family of hybrid pixel imagers tailored for crystallography experiments is under development
at CPPM in collaboration
with the DAM group (Diffraction and Abnormal Diffusion Multi-wavelengths) of the
ESRF (Grenoble) and the detector group at
SOLEIL synchrotron facility in Saint-Aubin, close to Saclay. The detector part is either made of silicon or of
The electronics part is designed to ensure large dynamics for instantaneous (10-2 up to
108 photons/s/mm2) and
integrated (1030 photons) light intensities and an image acquisition time of about a millisecond.
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