Comparison of focusing optics for femtosecond X-ray diffraction
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- Bargheer, M., Zhavoronkov, N., Bruch, R. et al. Appl. Phys. B (2005) 80: 715. doi:10.1007/s00340-005-1792-7
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We characterize and compare four different types of focusing optics for hard X-rays, suitable for femtosecond X-ray diffraction experiments, usinga tabletop femtosecond laser-based plasma source. We demonstrate a 23 μmfocus with a toroidally bent Ge single crystal. A maximum flux of 7× 108 photons/(s mm2) is generated in a 32 μm focus using a multi-layer mirror. An elliptical glass capillary yields the highest number of photons per Bragg angle [2× 105 photons/(s mrad)]. The largest number of photons[3× 106 photons/s] per second is obtained in the 105 μm focus of a poly-capillary optical lens system. All numbers are given for characteristic Cu Kα photons.