Three dimensional low-mode areal-density non-uniformities in indirect-drive implosions at the National Ignition Facility

Casey, D. T.; Landen, O. L.; Hartouni, E.; Bionta, R. M.; Hahn, K. D.; Volegov, P. L.; Fittinghoff, D. N.; Geppert-Kleinrath, V.; Wilde, C. H.; Milovich, J. L.; Smalyuk, V. A.; Field, J. E.; Hurricane, O. A.; Zylstra, A. B.; Kritcher, A. L.; Clark, D. S.; Young, C. V.; Nora, R. C.; Callahan, D. A.; MacGowan, B. J.; Munro, D. H.; Spears, B. K.; Peterson, J. L.; Gaffney, J. A.; Humbird, K. D.; Kruse, M. G.; Moore, A. S.; Schlossberg, D. J.; Gatu-Johnson, M.; Frenje, J. A.

doi:10.1063/5.0043589

Title: Three dimensional low-mode areal-density non-uniformities in indirect-drive implosions at the National Ignition Facility

Journal Article · Thu Apr 01 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0043589· OSTI ID:1812565

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

To achieve hotspot ignition, an inertial confinement fusion implosion must achieve high hotspot pressure that is inertially confined by a dense shell of DT fuel. This requires a symmetric implosion having high in-flight shell velocity and high areal density at stagnation. The size of the driver and scale of the capsule required can be minimized by maintaining a high efficiency of energy coupling from the imploding shell to the hotspot. Significant 3D low mode asymmetries, however, are commonly observed in indirect-drive implosions and reduce the coupling of shell kinetic energy to the hotspot. To better quantify the magnitudes and impacts of shell density asymmetries, we have developed new analysis techniques and analytic models [Hurricane et al., Phys. Plasmas 27(6), 062704 (2020)]. To build confidence in the underlying data, we have also developed an analytic neutron transport model to cross-compare two independent measurements of asymmetry, which shows excellent agreement across shots for mode-1 (ℓ = 1). This work also demonstrates that asymmetry can introduce potential sampling bias into down-scattered ratio measurements causing the solid-angle-average and uncertainty-weighted-average down-scattered ratios to differ significantly. Diagnosing asymmetries beyond mode-1 (ℓ > 1) presents significant challenges. Using new diagnostic instruments and analysis techniques, however, evidence of significant Legendre mode P2 (ℓ = 2, m = 0) and additional 3D asymmetries (ℓ > 1, m ≠ 0) are beginning to emerge from the high precision activation diagnostic data (real-time nuclear activation detectors) and down-scattered neutron imaging data.

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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:: 1812565

Alternate ID(s):: OSTI ID: 1777586

Report Number(s):: LLNL-JRNL-817908; 1027999; TRN: US2213261

Journal Information:: Physics of Plasmas, Vol. 28, Issue 4; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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