Kirkpatrick-baez microscope imaging with non-periodic multilayer films

The imaging characteristic of non-periodic multilayer Kirkpatrick-Baez (KB) microscope is analyzed based on propagation of rays, and contrasted with single layer and periodic multilayer KB microscopes. Compared with single layer KB microscope, multilayer KB microscope has bigger grazing angle, and wider field of view at the same resolution and collection efficiency. The reflectivity and energy resolution of periodic multilayer KB microscope is better than that of non-periodic multilayer KB microscope, but the non-periodic multilayer element has wider angular bandwidth and more uniform reflectivity, which improves the field of view and uniformity of image. The non-periodic multilayer mirrors with a grazing angle of 1.1330 degree possess 0.3 degree angular bandwidth. Backlit by 8 keV X-ray tube, the imaging experiment with non-periodic multilayer KB microscope was performed, and the results consist with theoretical analysis. (authors)