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JOURNAL ARTICLE

Compact hard x-ray split-delay system based on variable-gap channel-cut crystals

Yanwen Sun, Nan Wang, Sanghoon Song, Peihao Sun, Matthieu Chollet, Takahiro Sato, Tim B van Driel, Silke Nelson, Rajan Plumley, Jordi Montana-Lopez, Samuel W Teitelbaum, Johann Haber, Jerome B Hastings, Alfred Q R Baron, Mark Sutton, Paul H Fuoss, Aymeric Robert, Diling Zhu
Optics Letters 2019 May 15, 44 (10): 2582-2585
31090737
We present the concept and a prototypical implementation of a compact x-ray split-delay system that is capable of performing continuous on-the-fly delay scans over a range of ∼10  ps with sub-100 nanoradian pointing stability. The system consists of four channel-cut silicon crystals, two of which have gradually varying gap sizes from intentional 5 deg asymmetric cuts. The delay adjustment is realized by linear motions of these two monolithic varying-gap channel cuts, where the x-ray beam experiences pairs of anti-parallel reflections, and thus becomes less sensitive in output beam pointing to motion imperfections of the translation stages. The beam splitting is accomplished by polished crystal edges. A high degree of mutual coherence between the two branches at the focus is observed by analyzing small-angle coherent x-ray scattering patterns. We envision a wide range of applications including single-shot x-ray pulse temporal diagnostics, studies of high-intensity x-ray-matter interactions, as well as measurement of dynamics in disordered material systems using split-pulse x-ray photon correlation spectroscopy.

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