DOE OSTI · 3376773
Geometric optics model of Thomson scattering enhanced by parametric coupling
Abstract
We formulate a theory of Thomson scattering (TS) from inhomogeneous plasmas using a ray-tracing approach. The scattered radiation is described within the eikonal approximation, including convective gain arising from scattering instabilities driven by the TS probe laser. In the limit of a weak probe and vanishing gain, the theory recovers the standard TS cross section and scattered power due to volumetric particle noise. The ray-tracing formalism is implemented in a TS fitting framework, enabling accurate analysis of inhomogeneous plasmas whose background profiles can be provided by large-scale hydrodynamic simulations or experimental diagnostics. Here, several examples of synthetic TS spectra are presented, and further extensions of the theory are discussed.
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Carleton, D. E. [University of Alberta, Edmonton, AB (Canada)] (ORCID:0009000816677258), Myatt, J. F. [University of Alberta, Edmonton, AB (Canada)] (ORCID:0000000220639675), Rozmus, W. [University of Alberta, Edmonton, AB (Canada)] (ORCID:0009000926603727), Bruulsema, C. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000228793730), Milder, A. [Laboratory for Laser Energetics, Rochester, NY (United States)] (ORCID:0000000299886109), Palastro, J. P. [Laboratory for Laser Energetics, Rochester, NY (United States)] (ORCID:0000000267211924), Froula, D. H. [Laboratory for Laser Energetics, Rochester, NY (United States)] (ORCID:0000000169813956). 2026-06-15. Geometric optics model of Thomson scattering enhanced by parametric coupling. https://doi.org/10.1063/5.0332194
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