Dresden 2017 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 7: Poster: Microanalysis and Microscopy

MI 7.1: Poster

Mittwoch, 22. März 2017, 18:00–20:00, P4

Anisotropic X-ray optics for laboratory-based X-ray Imaging — •Toni Schiller, Malte Vassholz, and Tim Salditt — Institut für Röntgenphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, Göttingen

Recently, we proposed a technique for high resolution x-ray tomography with anisotropic source conditions [1]. This technique combines higher photon-flux of an extended source in one dimension with high spatial resolution of a point-source in the other. In that way imaging and tomography with a spatial resolution limited to the point-source direction can be achieved, applying modified Radon-Transform for reconstruction.

The content of this work presents technical solutions building and improving such a laboratory-setup. The aim is to push spatial resolution further from 100 µm to several microns. Main parts of the setup are a liquid-jet Gallium alloy x-ray-source and a high-performance mirror-optic. The mirror-optic focuses chromatic Ga-Kalpha light at 9.2keV to a focal spot of 70 µm FWHM . Within the focal plane a slit aperture of a few microns in height and >100 µm in width generates a virtual anisotropic source spot for 3D-Radon-Tomography. Characterizing source parameters as well as mirror-optic performance leads to geometric optimization of the setup applying theoretical models of wave propagation. Furthermore sampling and reconstruction routines are optimized to reduce acquisition as well as processing time.

[1] M.Vassholz, B.Koberstein-Schwarz, A.Ruhlandt, M.Krenkel and T.Salditt; Phys. Rev. Lett. 116, 088101 * Published 24 February 2016