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Characterization of graded d-spacing multilayers for hard x-ray telescopes

The Multilayer Facility at the Center for Astrophysics is involved in developing graded-d spacing multilayers for coating X-ray optics for hard x-ray focusing telescopes. Graded d spacing W/C multilayers have been fabricated on flat substrates of silicon and characterized using specular x-ray reflectivity, AFM, and TEM. Results are presented and compared with theoretical models.