Theory of x-ray photon correlation spectroscopy for multiscale flows
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.
Authors
- A. E. Gleason (ORCID: https://orcid.org/0000-0002-7736-5118)
- G. Gregori (ORCID: https://orcid.org/0000-0002-4153-0628)
- G. W. Collins (ORCID: https://orcid.org/0000-0002-4883-1087)
- Joshua J. Turner (ORCID: https://orcid.org/0000-0002-7974-8438)
- Hao Yin (ORCID: https://orcid.org/0000-0002-3257-4952)
- Eric G. Blackman (ORCID: https://orcid.org/0000-0002-9405-8435)
- Hussein Aluie (ORCID: https://orcid.org/0000-0003-3516-3697)
- Jessica K. Shang (ORCID: https://orcid.org/0000-0003-1466-7108)
- Charles Heaton (ORCID: https://orcid.org/0009-0005-8853-0341)
Institutions
- SLAC National Accelerator Laboratory (US)
- University of Oxford (GB)
- Menlo School (US)
- Energetics (United States) (US)
- Science Oxford (GB)
- University of Rochester (US)
- Stanford University (US)
Publication Details
- Journal
- Physical Review Research
- Published
- 2025-05-29
- DOI
- https://doi.org/10.1103/physrevresearch.7.023202
- Citations
- 1
- Primary Topic
- Advanced X-ray Imaging Techniques
- Type
- article
- Field-Weighted Citation Impact
- 1.88
Funders
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- University of Rochester
- National Energy Research Scientific Computing Center
- Nuclear Safety and Security Commission
- Office of Science
- National Nuclear Security Administration
- Engineering and Physical Sciences Research Council
- Trinity College, University of Oxford
- Division of Chemical, Bioengineering, Environmental, and Transport Systems
- Basic Energy Sciences
- SLAC National Accelerator Laboratory