Coherent Diffraction Imaging and Resonant Magnetic Scattering: DiProI Beamline on the FERMI@Elettra Seeded FEL

Wednesday, June 13, 2012 - 3:00pm

SpeakerEmanuele Pedersoli, Elettra and FERMI Lighsources 

Program Description

The seeded Free Electron Laser (FEL) FERMI@Elettra is designed to deliver very intense, fully coherent X-Rays pulses of wavelength down to 4 nm, with close to transform-limited bandwidth, unprecedented stability of photon energy and peak flux, multiple polarization. At present, FERMI-1 is providing wavelengths down to 20 nm, while FERMI-2, scheduled to reach at least 4 nm, is under commissioning.

The beam transport and analysis section provides online characterization of intensity, shape and spectrum of each pulse; the pump & probe capabilities under commissioning include the use of the IR seed, naturally synchronized with FEL pulses, or splitting of single FEL pulses using a delay line. Kirkpatrick-Baetz focalizing mirrors provide at present a 25 um spot; benders are under optimization to obtain a focus better than 5 um.

DiProI is the beamline designed for Coherent Diffraction Imaging (CDI), the lensless X-rays microscopy technique that has reached its ultimate potentials using coherent short FEL pulses to take single shot images of fixed samples or free standing objects. Thanks to the end station versatility and to tunability in wavelength, polarization and intensity of the FERMI seeded FEL, the DiProI beamline will perform experiments in resonant CDI, magnetic scattering, dichroism and other imaging techniques like ptychography, pinhole or differential holography.

During commissioning, the first results have been achieved, retrieving the first CDI images, single shot holograms of fixed samples and resonant magnetic scattering signal.

Coherent Diffraction Imaging and Resonant Magnetic Scattering: DiProI Beamline on the FERMI@Elettra Seeded FEL
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