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Wavefront sensing at X‐ray free‐electron lasers is important for quantitatively understanding the fundamental properties of the laser, for aligning X‐ray instruments and for conducting scientific experimental analysis. A fractional Talbot wavefront sensor has been developed. This wavefront sensor enables measurements over a wide range of energies, as is common on X‐ray instruments, with simplified...
A compact hard X‐ray split‐and‐delay line for studying ultrafast dynamics at free‐electron laser sources is presented. The device is capable of splitting a single X‐ray pulse into two fractions to introduce time delays from −5 to 815 ps with femtosecond resolution. The split‐and‐delay line can operate in a wide and continuous energy range between 7 and 16 keV. Compact dimensions of 60 × 60 × 30 cm...
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