The Göttingen Holography Endstation of Beamline P10 at PETRA III∕DESY

Abstract

Abstract.We report the commissioning of the novel holography endstation for the P10 coherence beamline at PETRA III at DESY. The experimental imaging scheme is based on a highly coherent and divergent (cone) beam illumination, achieved by fixed-curvature focusing mirrors with additional spatial and coherence filtering by x-ray waveguides. The optical elements along the beam path and the instrument in commissioning are described. First experimental results are shown.

Semi-transparent central stop in high-resolution X-ray ptychography using Kirkpatrick–Baez focusing

“…1a) consists of two pairs of beam-defining slits and Si attenuation foils in front of two elliptical X-ray mirrors in the KB geometry. The Pd-coated vertical mirror (WinlightX) and the horizontal mirror (JTEC) were designed for 4.05 mrad incident angle (centre) and focal distances of 302 mm and 200 mm, respectively [for details see Kalbfleisch et al (2011) and Kalbfleisch (2012)]. A 5 mm-diameter W pinhole was placed at $ 1 mm in front of the KB focus in order to guarantee the oversampling condition for ptychographic phasing (Miao et al, 1998) by effectively absorbing tails of the KB beam (Giewekemeyer et al, 2013).…”

High-flux ptychographic imaging using the new 55 µm-pixel detector `Lambda' based on the Medipix3 readout chip

“…The elliptically shaped mirrors (Pd coating) were used at 4.05 mrad incident angle (centre). The focal distances are 302 mm and 200 mm of the vertical mirror (WinlightX) and horizontal mirror (JTEC), respectively (for details see Kalbfleisch et al, 2011;Kalbfleisch, 2012). A soft-edge, rectangular aperture was placed 12 mm upstream of the nominal focal plane to suppress side lobes of the X-ray beam (Takahashi et al, 2013).…”

Phase retrieval problems in x-ray physics

“…The experiment was carried out at the Göttingen Instrument for Nano Imaging with coherent X-rays (GINIX), which is installed at the undulator beamline P10 of the PETRA III storage ring of the Deutsches Elektronen SYnchrotron (DESY). For previous cone-beam reconstructions of the same object we refer to [49,69]. The worm is partly illuminated (near the end) by a monochromatic 7.9 keV beam (bandwidth 0.01%).…”