Stationary Bragg reflection of laser light in inhomogeneous absorbing plasmas inside inertial confinement fusion Hohlraums

Vandenboomgaerde, M.; Casanova, M.; Chaland, F.; Bonnefille, M.; Grisollet, A.; Videau, L.; Depierreux, S.; Tassin, V.; Leidinger, J. -P.; Courtois, C.; Garnier, J.; Chen, H.

doi:10.1063/5.0170189

Title: Stationary Bragg reflection of laser light in inhomogeneous absorbing plasmas inside inertial confinement fusion Hohlraums

Journal Article · 10 December 2023 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0170189 · OSTI ID:2280481

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Atomique Energie Commission (CEA), Arpajon (France)
CEA, DAM, DIF 1 , F-91297 Arpajon, France
Ecole Polytechnique, Institut Polytechnique de Paris 2, Palaiseau (France)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Laser-produced plasma in inertial confinement fusion (ICF) Hohlraums are marked with density non-uniformity whose length scale can go down to micrometers. This scale is of the order of the laser wavelength. The WKB approximation, which is classically used in radiation-hydrodynamic codes to compute the laser trajectory, cannot correctly take into account such small-scale inhomogeneity of the plasma. Going beyond this approximation, we predict a novel mechanism for the laser reflection. Here we show that an electromagnetic plane wave with wave number k resonates with the k_B=2 k Fourier component of a multimode perturbation of the background density and generates a reflected wave. It is the first time that this reflection is considered for stationary inhomogeneous ICF plasmas, and the energy absorption is taken into account. This mechanism, which is a form of Bragg reflection, can occur away from the critical surface and generate a drift of the location of the laser absorption. Furthermore, this absorption will be periodically modulated with a k_B wave number. The stationary Bragg reflection can explain ongoing discrepancies between experimental and numerical data about laser trajectory and absorption in ICF Hohlraums.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2280481

Report Number(s):: LLNL-JRNL-839921; 1060000

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 30; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Title: Stationary Bragg reflection of laser light in inhomogeneous absorbing plasmas inside inertial confinement fusion Hohlraums

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