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Figure 6
(a) Schematic layout of the moiré XGI experimental setup at the SLAC XPP beamline. The XFEL pulses with 9.5 keV photon energy are focused with a stack of 20 compound refractive lenses followed by a corrective phase plate for diffraction-limited focusing. The grating interferometer was installed further downstream, consisting of phase (P) and absorption (A) gratings. Red arrows indicate moiré fringe periods px and py extracted via two-dimensional Fourier analysis (see text). (b) Selected moiré interferograms measured by rotating the absorption grating; (c) with extracted moiré fringe frequencies px and py in the horizontal and vertical directions for calibration. (d) Angular calibration of the moiré XGI, vertical arrows indicate the relative β offset between the two gratings indicated in panel (a).

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