Hot electron preheat in hydrodynamically scaled direct-drive inertial confinement fusion implosions on the NIF and OMEGA

Rosenberg, Michael J.; Solodov, Andrey A.; Stoeckl, Christian; Hohenberger, Matthias; Bahukutumbi, Radha; Theobald, Wolfgang; Edgell, Dana; Filkins, Timothy; Betti, R.; Marshall, Frederic J.; Shah, Rahul C.; Turnbull, David P.; Christopherson, Alison R.; Lemos, Nuno; Tubman, Eleanor; Regan, Sean P.

doi:10.1063/5.0152191

Title: Hot electron preheat in hydrodynamically scaled direct-drive inertial confinement fusion implosions on the NIF and OMEGA

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

DOI:https://doi.org/10.1063/5.0152191· OSTI ID:1992640

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Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Hot electron preheat has been quantified in warm, directly driven inertial confinement fusion implosions on OMEGA and the National Ignition Facility (NIF), to support hydrodynamic scaling studies. These CH-shell experiments were designed to be hydrodynamically equivalent, spanning a factor of 40 in laser energy and a factor of 3.4 in spatial and temporal scales, while preserving the incident laser intensity of 10¹⁵ W/cm². Experiments with similarly low levels of beam smoothing on OMEGA and NIF show a similar fraction (~0.2%) of laser energy deposited as hot electron preheat in the unablated shell on both OMEGA and NIF and similar preheat per mass (~2 kJ/mg), despite the NIF experiments generating a factor of three more hot electrons (~1.5% of laser energy) than on OMEGA (~0.5% of laser energy). This is plausibly explained by more absorption of hot electron energy in the ablated CH plasma on NIF due to larger areal density, as well as a smaller solid angle of the imploding shell as viewed from the hot electron generating region due to the hot electrons being produced at a larger standoff distance in lower-density regions by stimulated Raman scattering, in contrast to in higher-density regions by two-plasmon decay on OMEGA. Finally, the results indicate that for warm implosions at intensities of around 10¹⁵ W/cm², hydrodynamic equivalence is not violated by hot electron preheat, though for cryogenic implosions, the reduced attenuation of hot electrons in deuterium–tritium plasma will have to be considered.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1992640

Journal Information:: Physics of Plasmas, Vol. 30, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Title: Hot electron preheat in hydrodynamically scaled direct-drive inertial confinement fusion implosions on the NIF and OMEGA

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