PIER Photon Science Colloquium: X-ray crystal optics: Shaping next generation research tools and sources

by Yuri Shvyd'ko (Argonne National Laboratory, Argonne, USA)

Friday 27 Jun 2014, 14:00 → 15:00 Europe/Berlin

CFEL, Bldg. 99 (DESY Hamburg)

Recent advances will be reviewed, how x-ray crystal optics helps creating next generation x-ray research tools with highest spectral resolution and x-ray sources with highest spectral brightness. Angular dispersive crystal optics was crucial to the development and recent realization at the APS of a conceptually new inelastic x-ray scattering (IXS) spectrometer with sub-meV resolution. The spectrometer opens up hitherto inaccessible region of the time- and length-scale landscape of collective excitations in condensed matter. Spectral resolution as small as 0.1 meV is possible, however, to be practical x-ray sources are required with spectral brightness higher than that available at modern synchrotron radiation facilities. High-repetition-rate seeded XFELs, in particular the European XFEL, would be the best option. Forward Bragg diffraction (FBD) x-ray monochromator was a key optical component for achieving self-seeding in an XFEL at SLAC, and for producing intense x-ray pulses with a well defined narrow spectrum. Theory, realization, and optimization of the FBD monochromators will be discussed for XFELs to generate x-rays of highest spectral brightness essential for high-resolution spectroscopies: IXS, RIXS, Mossbauer, etc.