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

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2582-2585
Number of pages4
JournalOptics Letters
Issue number10
StatePublished - May 15 2019
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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