Comparison of focusing optics for femtosecond X-ray diffraction
نویسندگان
چکیده
We characterize and compare four different types of focusing optics for hard X-rays, suitable for femtosecond X-ray diffraction experiments, using a tabletop femtosecond laser-based plasma source. We demonstrate a 23μm focus with a toroidally bent Ge single crystal. A maximum flux of 7 × 108 photons/(s mm2) is generated in a 32μm 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. PACS 07.85.Fv; 61.10.Nz; 82.53-k
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