Abstract
We present results of study of optical properties of extremely thick refractive lens when the thickness (or length) of a compound refractive lens is comparable with its focal distance. We tested a 2D parabolic compound refractive lens composed from 300-500 elements. Each element is a bi-concave lens made from aluminum with the curvature radius <i>R</i> = 0.2 mm and thickness 1 mm. Special long holders were designed and manufactured to keep up to 500 of elements. As far as the thin lens approximation is not valid we developed and used accurate theory of long parabolic compound lens for ray-tracing analysis. The experimental measurements were performed for the X-ray energies E = 20-30 keV. The measured focus distance and effective aperture correlate with the theory.
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