Modeling and projecting implosion performance for the National Ignition Facility

Clark, D. S.; Weber, C. R.; Kritcher, A. L.; Milovich, J. L.; Patel, P. K.; Haan, S. W.; Hammel, B. A.; Koning, J. M.; Marinak, M. M.; Patel, M. V.; Schroeder, C. R.; Sepke, S. M.; Edwards, M. J.

doi:10.1088/1741-4326/aabcf7

Title: Modeling and projecting implosion performance for the National Ignition Facility

Journal Article · Tue Dec 18 00:00:00 EST 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aabcf7· OSTI ID:1671191

Clark, D. S. ^[1]; Weber, C. R. ^[1]; Kritcher, A. L. ^[1]; Milovich, J. L. ^[1]; Patel, P. K. ^[1]; Haan, S. W. ^[1]; Hammel, B. A. ^[1]; Koning, J. M. ^[1]; Marinak, M. M. ^[1]; Patel, M. V. ^[1]; Schroeder, C. R. ^[1]; Sepke, S. M. ^[1]; Edwards, M. J. ^[1]

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

Steady progress is being made in inertial confinement fusion experiments at the National Ignition Facility (NIF). Nonetheless, substantial further progress is still needed to reach the ultimate goal of fusion ignition. Closing the remaining gap will require either improving the quality of current implosions, increasing the implosion scale (and correspondingly the energy delivered by NIF), or some combination of the two. But how much of an improvement in implosion quality or energy scale is required to reach ignition? To reliably answer this question, an accurate understanding of current and past experiments is first required. Previous modeling efforts of NIF implosions have shown the need to resolve a wide range of scales (from microns to millimeters) as well as a faithful representation of the genuinely three-dimensional (3D) character of the stagnation process. Modeling NIF implosions is further complicated by the many perturbation sources that have been found to influence integrated implosion performance: flux asymmetries from the surrounding hohlraum, engineering features such as support tents and fill tubes, surface defects and contaminants, and more recently the radiation shadow cast by the fill tube on the capsule. A model including all of these effects, and with adequate resolution, challenges current computing capabilities but has recently become feasible on the largest computers. Here, we review the status of these multi-effect, 3D simulations of NIF implosions, their comparison to experimental data, and preliminary results on scaling these simulations to the threshold of ignition on NIF.

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

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1671191

Report Number(s):: LLNL-JRNL-813845; 1022069; TRN: US2203894

Journal Information:: Nuclear Fusion, Vol. 59, Issue 3; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (6)

Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube Weber, C. R.; Clark, D. S.; Pak, A. Physics of Plasmas, Vol. 27, Issue 3 https://doi.org/10.1063/1.5125599	journal	March 2020
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Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions Clark, D. S.; Weber, C. R.; Milovich, J. L. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5091449	journal	May 2019
Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots Tong, J. K.; McGlinchey, K.; Appelbe, B. D. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab22d4	journal	June 2019
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Implosion performance of subscale beryllium capsules on the NIF Zylstra, A. B.; MacLaren, S.; Yi, S. A. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5098319	journal	May 2019