Structure factors in the temporal domain at modern storage rings

QUICK INFORMATION
Type
Seminar
Start Date
19-09-2019 13:00
End Date
19-09-2019 14:00
Location
Room 500 - 501, Central Building
Speaker's name
Federico ZONTONE
Speaker's institute
ESRF Grenoble, France
Contact name
Claudine Roméro
Host name
Michael Wulff
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The remarkable development of the architecture of modern synchrotron storage rings leads to a substantial increase of the coherent fraction in hard x-ray beams, from few 0.1% up to 10%, thanks to the reduction of the electron beam emittance via the multi-bend achromat design. The direct consequence is that diffraction (coherent scattering) will be the main elastic response of every sample at “X-ray” length scales, i.e. down to interatomic distances, independently of the degree of internal order. In addition, the hundred-time increase of the coherent intensity will give access to dynamical structure factors, S(q,t), in temporal and q-domains totally inaccessible so far, thanks to the improved capabilities of X-ray Photon Correlation Spectroscopy (XPCS) which monitors the temporal fluctuations of the interferences (speckles) of the coherent scattered radiation. New scientific frontiers will be reachable by easing the access to soft and hard matter in bulky environments, crowded media, extreme condition of high-temperature and pressure… In addition, the static case S(q) can be used to generalize (protein) crystallographic methods to disordered samples, providing an adequate sampling of the continuous “Bragg” pattern. Coherent X-ray Diffraction Imaging (CXDI) at modern synchrotron sources will then be a powerful tool to image matter at the nanoscale (below 10nm) and it will allow nanoscale tomography entering the time-resolved domain in slowly evolving systems. Ptychographic CXDI coupled to a long setup will remove the limitations in field of view to image at high resolution relevant family of cells too big for standard CXDI (up to 100 mm in size), e.g. neurons.

Examples of recent research on disordered soft and hard materials carried out at the ESRF beamline ID10 together with new technical implementations will illustrate how the future EBS-L1 beamline will revolutionize coherent-X-rays based techniques.

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