Figure 6.

Fresnel zone plate microfocus optics. (A) Simplified schematic diagram of a Fresnel zone plate microfocus optic. The X-rays from the source are depicted as parallel rays, and following the zone plate converge on a focus at the sample. (B) Positioning of order sorting aperture and beam stop in a typical Fresnel zone plate-based XFI experiment. The order sorting aperture serves to reject the light from diffraction orders other than 1, with the sample ideally located at the order 1 beam focus.