AbstractA proposed hard x-ray (>10 keV) telescope design uses multilayers on gold coated replica substrates. We investigated the grazing incidence x-ray reflectivity (0.154 nm) of super polished fused silica, gold coated fused silica, and mutilayers deposited on each. Gold coatings of 100 nm were deposited by both magnetron sputtering and ion beam sputtering. Carbon/nickel multilayers (20 layer pair with 4.0 nm d-spacing) were deposited by ion beam sputtering. We report the results of specular and diffuse reflectivity characterizations of these samples. The easured x-ray reflectivities are compared to model calculations evaluating film thickness, ensity, optical properties, and interface roughness/diffusion. It is concluded that substrate and film quality (roughness and density) can be determined by grazing incidence reflectivity measurements and correlated to final multilayer reflectivity and model calculations.
Nanostructures on fused silica surfaces produced by ion beam sputtering with Al co-deposition
