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![[Figure 2]](vl5023fig2mag.jpg)
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Figure 2
(a) The empty-beam-corrected intensity measured on the detector I/I0 for a beam energy of 13.8 keV with the capillary of the optical stretcher in the beam is determined from two 1 s exposures with the Pilatus detector during waveguide alignment. The spatial axes are given in pixels (px). Visible are the liquid-filled inner part and the walls of the quadratic glass capillary as well as empty areas around the capillary. The brown solid and dashed rectangles represent the field of view of the Zyla detector and its used area, respectively. Scale bar: 20 µm. (b) Empty-beam-corrected intensity profile for 13.8 keV with mean values along the individual columns in (a). The red lines represent calculated values based on the dimensions of the capillary. The capillary walls show slightly lower intensity than the inner part of the capillary. Scale bar: 20 µm. (c, d) Average holograms Hcap, E of the liquid-filled capillary without cells which are recorded with the Zyla detector. The field of view is represented by the dashed rectangle in (a). Scale bars: 20 µm. The dark spots stem from phase-shift and absorption that is generated by debris on the inner or outer surfaces of the capillary (see white arrows for an example). (c) Two data sets with in total 353.1 s exposure time are normalized and averaged to represent the average background hologram of the empty capillary for 9.9 keV. (d) In analogy, in total 351.6 s exposure time are normalized and averaged for a photon energy of 13.8 keV. (e) Distributions of the empty-beam-corrected intensities in the average background holograms for both photon energies, 9.9 keV and 13.8 keV, as shown in (c) and (d), respectively. For better visualization, outliers are not included in the plots. The vertical lines represent the median values of the distributions. |
![[Figure 2]](vl5023fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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