X-ray refractive planar lenses in combination with planar X-ray waveguide

The optical system composed of an X-ray silicon planar refractive lens and an X-ray planar waveguide with air gap has been characterized with synchrotron radiation. The guiding structure consisted of two silicon plates, clamped by permanent magnets and divided by a spacer made of thin magnetic film. The system was studied in the energy range 8 - 17 keV on the Optics beamline BM05 at the ESRF (Grenoble). It was shown, that the number of resonant modes in the beam exiting from the waveguide could be controlled by planar lens orientation, so that minimal number of modes could be obtained. Refractive optics elements and X-ray planar waveguides are a good combination for synchrotron sources of last generation and free electron lasers.