Planar parabolic X-ray refractive lens made of glassy carbon

Experimental results of synchrotron radiation focusing by parabolic planar compound refractive lenses, made of glassy carbon, are presented. The lenses with the curvature radius of 5 and 200 μm, and with the geometric aperture of 40 and 900 μm were developed. The number of bi-concave elements in the compound lenses was from 4 to 200. The experiments were performed at the ESRF at the bending magnet beamline BM-5. The minimum size of the focus was observed as 1.4 μm.