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DOE OSTI · 2575188

Theory of x-ray photon correlation spectroscopy for multiscale flows

Yin, Hao [University of Rochester, NY (United States)] (ORCID:0000000232574952)·Heaton, Charles [University of Oxford (United Kingdom)] (ORCID:0009000588530341)·Blackman, Eric G. [University of Rochester, NY (United States)] (ORCID:0000000294058435)·Gleason, Arianna E. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000277365118)·Turner, Joshua J. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)]·Collins, Gilbert W. [University of Rochester, NY (United States)]·Gregori, Gianluca [University of Oxford (United Kingdom)] (ORCID:0000000241530628)·Shang, Jessica K. [University of Rochester, NY (United States)] (ORCID:0000000314667108)·Aluie, Hussein [University of Rochester, NY (United States)] (ORCID:0000000335163697)
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Abstract

Complex multiscale flows associated with instabilities and turbulence are commonly induced under high-energy density (HED) conditions, but accurate measurement of their transport properties has been challenging. X-ray photon correlation spectroscopy (XPCS) with coherent x-ray sources can, in principle, probe material dynamics to infer transport properties using time autocorrelation of density fluctuations. Here we develop a theoretical framework for utilizing XPCS to study material diffusivity in multiscale flows. We extend single-scale shear flow theories to broadband flows using a multiscale analysis that captures shear and diffusion dynamics. Our theory is validated with simulated XPCS for Brownian particles advected in multiscale flows. We demonstrate the versatility of the method over several orders of magnitude in timescale using sequential-pulse XPCS, single-pulse x-ray speckle visibility spectroscopy (XSVS), and double-pulse XSVS.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSBrownian dynamicsDiffusionHydrodynamic instabilitiesHydrodynamicsPlasma transportStochastic analysisTurbulenceX-ray photon correlation spectroscopy

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Yin, Hao [University of Rochester, NY (United States)] (ORCID:0000000232574952), Heaton, Charles [University of Oxford (United Kingdom)] (ORCID:0009000588530341), Blackman, Eric G. [University of Rochester, NY (United States)] (ORCID:0000000294058435), Gleason, Arianna E. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000277365118), Turner, Joshua J. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)], Collins, Gilbert W. [University of Rochester, NY (United States)], Gregori, Gianluca [University of Oxford (United Kingdom)] (ORCID:0000000241530628), Shang, Jessica K. [University of Rochester, NY (United States)] (ORCID:0000000314667108), Aluie, Hussein [University of Rochester, NY (United States)] (ORCID:0000000335163697). 2025-05-29. Theory of x-ray photon correlation spectroscopy for multiscale flows. https://doi.org/10.1103/physrevresearch.7.023202

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