Journal article
Theory of x-ray photon correlation spectroscopy for multiscale flows
- 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 4.2MB, Terms of use)
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- Publisher copy:
- 10.1103/t9t3-3ngh
Authors
+ Engineering and Physical Sciences Research Council
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- Funder identifier:
- https://ror.org/0439y7842
- Grant:
- EP/X025373/1
- PHPL_PA2254
- Publisher:
- American Physical Society
- Journal:
- Physical Review Research More from this journal
- Volume:
- 7
- Article number:
- 023202
- Publication date:
- 2025-05-13
- Acceptance date:
- 2025-05-12
- DOI:
- EISSN:
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2643-1564
- Language:
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English
- Pubs id:
-
2123415
- Local pid:
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pubs:2123415
- Deposit date:
-
2025-05-13
Terms of use
- Copyright date:
- 2025
- Rights statement:
- Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
- Notes:
- The author accepted manuscript (AAM) of this paper has been made available under the University of Oxford's Open Access Publications Policy, and a CC BY public copyright licence has been applied.
- Licence:
- CC Attribution (CC BY)
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