Abstract
Polycapillary optics are highly efficient devices for focusing high-energy photons and thermal neutrons. Here we will present our studies by modeling and simulating X-ray propagation through cylindrical polycapillary optics using PolyCAD, a ray-tracing original package developed by our group. PolyCAD is a CAD program designed for X-ray photon tracing in polycapillary optics. PolyCAD allows simulating any type of X-ray source like an X-ray tube of finite beam dimensions or an astrophysical object in combination with different kinds of polycapillary optics. Experimental data have been compared with theoretical predictions, in particular the focusing properties of a cylindrical lens have been visualized by collecting 3D images, and reconstructed using PolyCAD simulations. The acquired images put into evidence how the focal spot profiles, including intensity and widths, at different projection distances, agree with calculations. In the second part of this work, we present some characterization methodologies used for studying several kind of polycapillary optics. The procedure is divided principally in two kind of measurements: "angular measurements" for studying lens's transmission coefficient and focusing properties, and "CCD images" for characterizing lens's focal spot.
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