Open AccessX‐ray collimation by crystals with precise parabolic holes based on diffractive–refractive optics
Author(s) -
Oberta Peter,
Mikulík Peter,
Kittler Martin,
Hrdý Jaromir
Publication year - 2011
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/s0909049511009083
Subject(s) - collimated light , optics , beam (structure) , crystal (programming language) , monochromator , x ray optics , asymmetry , diffraction , range (aeronautics) , physics , materials science , x ray , laser , wavelength , quantum mechanics , computer science , composite material , programming language
Two crystals with precise parabolic holes were used to demonstrate sagittal beam collimation by means of a diffractive–refractive double‐crystal monochromator. A new approach is introduced and beam collimation is demonstrated. Two Si(333) crystals with an asymmetry angle of α = 15° were prepared and arranged in a dispersive position (+,−,−,+). Based on theoretical calculations, this double‐crystal set‐up should provide tunable beam collimation within an energy range of 6.3–18.8 keV (Θ B = 71–18.4°). An experiment study was performed on BM05 at ESRF. Using 8.97 keV energy, the beam profile at various distances was measured. The experimental results are in good agreement with theoretical predictions. Owing to insufficient harmonic suppression, the collimated (333) beam was overlapped by horizontally diverging (444) and (555) beams.