Open AccessDiffraction properties of a strongly bent diamond crystal used as a dispersive spectrometer for XFEL pulses
Author(s) -
Samoylova Liubov,
Boesenberg Ulrike,
Chumakov Aleksandr,
Kaganer Vladimir,
Petrov Ilia,
Roth Thomas,
Rüffer Rudolf,
Sinn Harald,
Terentyev Sergey,
Madsen Anders
Publication year - 2019
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577519004880
Subject(s) - bent molecular geometry , optics , diffraction , physics , crystal (programming language) , pulse (music) , diamond , bragg's law , reflection (computer programming) , laser , spectrometer , bending , materials science , detector , computer science , composite material , thermodynamics , programming language
Self‐amplified spontaneous emission (SASE) enables X‐ray free‐electron lasers (XFELs) to generate hard X‐ray pulses of sub‐100 fs duration. However, due to the stochastic nature of SASE, the energy spectrum fluctuates from pulse to pulse. Many experiments that employ XFEL radiation require the resolution of the spectrum of each pulse. The work presented here investigates the capacity of a thin strongly bent diamond crystal to resolve the energy spectra of hard X‐ray SASE pulses by studying its diffraction properties. Rocking curves of the symmetric C*(440) reflection have been measured for different bending radii. The experimental data match the theoretical modelling based on the Takagi–Taupin equations of dynamical diffraction. A uniform strain gradient has proven to be a valid model of strain deformations in the crystal.