Nonlinear models for coupling the effects of stimulated Raman scattering to inertial confinement fusion codes

Stark, David James; Yin, Lin; Nguyen, Truong Ba; Chen, Guangye; Chacon, Luis; Haines, Brian Michael; Green, Lauren Maranne

doi:10.1063/5.0134881

Title: Nonlinear models for coupling the effects of stimulated Raman scattering to inertial confinement fusion codes

Journal Article · Mon Apr 17 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0134881· OSTI ID:2007363

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Laser plasma instabilities (LPI) reduce driver-target coupling, alter implosion symmetry, and therefore can fundamentally limit fusion performance in inertial confinement fusion (ICF). Developing a predictive modeling capability for LPI effects can critically advance the success of the field. We perform vector particle-in-cell simulations of multi-speckled laser beams undergoing stimulated Raman scattering (SRS) at various densities and intensities relevant to mainly indirectly driven and a subset of parameter space for directly driven ICF systems, focusing on the regimes with intensities above the onset of electron trapping. Based on the wavenumber of the SRS daughter electron plasma wave, we identify several regions with underpinning SRS saturation physics: the electron-trapping dominated region with intermediate $kλ$_$$D$$ values, the strong Landau damping region at larger $kλ$_$$D$$ values, and the region where the Langmuir decay instability arises at lower $kλ$_$$D$$ values. We develop a nonlinear SRS reflectivity model that features the base trapping-dominated scaling of ($kλ$_$$D$$)^-4 and its modifications. Electron trapping deforms the initialized electron distribution functions, and we have developed a new δf-Gaussian-mixture algorithm for an accurate characterization of the trapped hot electron population. With this SRS hot electron description, we construct a nonlinear energy deposition model and a hot electron source model—based on a modified Manley–Rowe relation—suitable for including SRS effects as a sub-grid module in a high-fidelity ICF design code.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2007363

Report Number(s):: LA-UR-22-31871

Journal Information:: Physics of Plasmas, Vol. 30, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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