First study of Hohlraum x-ray preheat asymmetry inside an ICF capsule

Dewald, E. L.; Landen, O. L.; Salmonson, J.; Masse, L.; Tabak, M.; Smalyuk, V. A.; Schiaffino, S.; Heredia, R.; Schneider, M.; Nikroo, A.

doi:10.1063/5.0027467

Title: First study of Hohlraum x-ray preheat asymmetry inside an ICF capsule

Journal Article · Wed Dec 16 00:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0027467· OSTI ID:1764324

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^[1]; Salmonson, J. ^[1];

^[1]; Tabak, M. ^[1]; Smalyuk, V. A. ^[1]; Schiaffino, S. ^[1]; Heredia, R. ^[1];

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In indirect drive inertial confinement fusion (ICF), laser induced Hohlraum preheat radiation (so-called M-band, >1.8 keV) asymmetry will lead to asymmetric ablation front and ablator–fuel interface hydrodynamic instability growth in an imploding capsule. First experiments to infer the M-band asymmetries at the capsule were performed on the National Ignition Facility for high density carbon (HDC) ICF capsules in low density fill (0.3 mg/cc ⁴He) Au Hohlraums by time resolved imaging of 2.3 keV fluorescence emission of a smaller Mo sphere placed inside the capsule. In this study, the measured Mo emission is pole hot (P₂ > 0) since M-band is generated mainly by the outer laser beams as their irradiance at the Hohlraum wall is 5× higher than for the inner beams. P₂ has a greater negative than positive swing vs time [Δ(P₂/P₀)/Δt ~ 0.2/ns], giving insight into laser heated Hohlraum dynamics. P₄ asymmetry is small at the sphere due to efficient geometric smoothing of Hohlraum asymmetries at large Hohlraum-to-capsule ratios. The M-band P₂ history is qualitatively reproduced by radiation hydrodynamic HYDRA simulations. The smaller P₂ than that calculated earlier suggests either less outer beam spot motion and/or preheat emission. At late times, the observed P₂ swing is larger and P₄ is more negative than simulated, which could be due to inner beams being stopped more in the outer beams wall plasma bubble than simulated. Asymmetry at the HDC capsule inner surface (“ice–ablator interface”) is also inferred from the Mo emission asymmetry by an analytic viewfactor model, accounting for the Mo/HDC radius difference and HDC capsule opacity.

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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:: 1764324

Alternate ID(s):: OSTI ID: 1765923

Report Number(s):: LLNL-JRNL-813556; 1021432; TRN: US2206166

Journal Information:: Physics of Plasmas, Vol. 27, Issue 12; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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