title: Curved diamond-crystal spectrographs for x-ray free-electron laser noninvasive diagnostics.
abstract: We report on the manufacturing and X-ray tests of bent diamond-crystal X-ray spectrographs, designed for noninvasive diagnostics of the X-ray free-electron laser (XFEL) spectra in the spectral range from 5 to 15 keV. The key component is a curved, 20-μm thin, single crystalline diamond triangular plate in the (110) orientation. The radius of curvature can be varied between R = 0.6 m and R = 0.1 m in a controlled fashion, ensuring imaging in a spectral window of up to 60 eV for ≃8 keV X-rays. All of the components of the bending mechanism (about 10 parts) are manufactured from diamond, thus ensuring safe operations in intense XFEL beams. The spectrograph is transparent to 88% for 5-keV photons and to 98% for 15-keV photons. Therefore, it can be used for noninvasive diagnostics of the X-ray spectra during XFEL operations.
authors.affiliation: Technological Institute for Superhard and Novel Carbon Materials, 142190 Troitsk, Russian Federation.
authors.forename: Sergey
authors.initials: S
authors.lastname: Terentyev
authors.affiliation: Technological Institute for Superhard and Novel Carbon Materials, 142190 Troitsk, Russian Federation.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Blank
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Kolodziej
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Shvyd'ko
mesh_terms: D018130:Diamond; D007834:Lasers; D008962:Models, Theoretical; D014961:X-Ray Diffraction / Q000379:methods*; D014965:X-Rays
chemical_list: D018130:Diamond