Abstract

Macromolecular crystallography often requires focused high-intensity x-ray beams for solving challenging protein structures from micrometer-sized crystals using current synchrotron radiation sources. The design of optical focusing schemes for hard x-rays showing high efficiency and flexibility in beam size is therefore continuously pursued. Here, we present an innovative solution based on a two-stage demagnification of the undulator source for photon energies from 6 keV to 19 keV, commissioned at the X10SA beamline of the Swiss Light Source, where a secondary source is imaged by two crossed silicon kinoform x-ray diffractive lenses with 75 nm outermost zone width. A source-size limited spot with a size of $4.8\mathrm{\mu m}\times 1.7\mathrm{\mu m}$ $(\mathrm{h}\times \mathrm{v},\mathrm{FWHM})$ and flux of $7.5\times {10}^{10}\mathrm{photons}/\mathrm{s}$ at 12.4 keV is demonstrated at the sample position.

© 2018 Optical Society of America

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