The Rainwater Memorial Calibration Facility for X-Ray Optics

Figure 7

Sketch of full flood illumination (top) and subaperture testing (middle) of the optic as well as flat witness sample test setup (bottom). (Top) Full flood illumination has no limitations on the beam before the focusing optic is hit, but a detector slit is located at the focus before the detector. Alignment happens first through optical means then using X-rays and full flood illumination. (Middle) Subaperture testing involves a coarse aperture plate followed by a fine aperture plate which selects a subgroup of layers for investigation. To achieve a pseudoparallel beam, the optic is rotated in yaw. (Bottom) The aperture plates are replaced with an optic slit (identical to detector slit) and an extremely flat vacuum chuck is mounted in place of the optic fixture. Flat witness samples can now be mounted and tested with a grazing incidence white pencil beam.