A flexible and standalone forward simulation model for laboratory X-ray diffraction contrast tomography

Fang, H.; Juul Jensen, D.; Zhang, Y.

doi:10.1107/S2053273320010852

Acta Crystallographica Section A
Acta Crystallographica
Section A FOUNDATIONS AND ADVANCES

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Figure 1
Schematic view of the LabDCT setup in a laboratory coordinate system ( $[\hat {\bf x}]$ , $[\hat {\bf y}]$ , $[\hat {\bf z}]$ ). Laue focusing occurs from a volume element of a grain, centered at position M, in a polycrystalline sample illuminated by a cone-shaped polychromatic X-ray beam from point S. The detector is placed perpendicular to the horizontal line in the downstream transmitted direct beam. The diffraction plane defined by the incoming wavevector K_in and scattered wavevector K_out determines the position Q on the detector for the diffracted beam. G_lab is the scattering vector and its projection on the detector is along $[\overrightarrow {PQ}]$ . The sample rotation angle is denoted as ω. L_ss is the sample-to-source distance and L_sd is the sample-to-detector distance. The zoom-in views (at the bottom) illustrate that the volume element focuses the incoming conical X-rays with a small range of wavelengths between λ₁ and λ_n onto the detector along $[\overrightarrow {PQ}]$ , while the diffraction pattern is magnified perpendicular to $[\overrightarrow {PQ}]$ .

FOUNDATIONS
ADVANCES

ISSN: 2053-2733

Volume 76| Part 6| November 2020| Pages 652-663

https://doi.org/10.1107/S2053273320010852

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