TY  - JOUR
A1  - Kaganer, Vladimir M.
A1  - Petrov, Ilia
A1  - Samoylova, Liubov
T1  - X-ray diffraction from strongly bent crystals and spectroscopy of X-ray free-electron laser pulses
Y1  - 2019
VL  - 76
IS  - 1
SP  - 55
EP  - 69
JF  - Acta Crystallographica Section A
DO  - 10.1107/S2053273319014347
DO  - 10.23689/fidgeo-4846
N2  - The use of strongly bent crystals in spectrometers for pulses of a hard X-ray free-electron laser is explored theoretically. Diffraction is calculated in both dynamical and kinematical theories. It is shown that diffraction can be treated kinematically when the bending radius is small compared with the critical radius given by the ratio of the Bragg-case extinction length for the actual reflection to the Darwin width of this reflection. As a result, the spectral resolution is limited by the crystal thickness, rather than the extinction length, and can become better than the resolution of a planar dynamically diffracting crystal. As an example, it is demonstrated that spectra of the 12 keV pulses can be resolved in the 440 reflection from a 20 µm-thick diamond crystal bent to a radius of 10 cm.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9192
ER  -