Observation of persistent species temperature separation in inertial confinement fusion mixtures

Haines, Brian Michael; Shah, Rahul C; Smidt, Joseph Michael; Albright, Brian James; Cardenas, Tana; Douglas, Melissa Rae; Forrest, Chad; Glebov, Vladimir Yu; Gunderson, Mark A.; Hamilton, Christopher Eric; Henderson, Kevin C.; Kim, Yong Ho; Lee, Matthew Nicholson; Murphy, Thomas Joseph; Oertel, John A.; Olson, Richard Edward; Patterson, Brian M.; Randolph, Randall Blaine; Schmidt, Derek William

doi:10.1038/s41467-020-14412-y

Title: Observation of persistent species temperature separation in inertial confinement fusion mixtures

Journal Article · 27 January 2020 · Nature Communications

DOI: https://doi.org/10.1038/s41467-020-14412-y · OSTI ID:1604025

^[1]; Shah, Rahul C ^[1];

^[1];

^[1]; Douglas, Melissa Rae ^[1]; Forrest, Chad ^[2]; Glebov, Vladimir Yu ^[2];

^[1];

^[1]; Oertel, John A. ^[1];

^[1];

^[1]; Randolph, Randall Blaine ^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

The injection and mixing of contaminant mass into the fuel in inertial confinement fusion (ICF) implosions is a primary factor preventing ignition. ICF experiments have recently achieved an alpha-heating regime, in which fusion self-heating is the dominant source of yield, by reducing the susceptibility of implosions to instabilities that inject this mass. We report the results of unique separated reactants implosion experiments studying pre-mixed contaminant as well as detailed high-resolution three-dimensional simulations that are in good agreement with experiments. At conditions relevant to mixing regions in high-yield implosions, we observe persistent chunks of contaminant that do not achieve thermal equilibrium with the fuel throughout the burn phase. The assumption of thermal equilibrium is made in nearly all computational ICF modeling and methods used to infer levels of contaminant from experiments. We estimate that these methods may underestimate the amount of contaminant by a factor of two or more.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1604025

Report Number(s):: LA-UR--19-20184

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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A new Generation of los Alamos Opacity Tables Colgan, J.; Kilcrease, D. P.; Magee, N. H. The Astrophysical Journal, Vol. 817, Issue 2 https://doi.org/10.3847/0004-637X/817/2/116	journal	January 2016
Species separation and modification of neutron diagnostics in inertial-confinement fusion Inglebert, Aurelie; Canaud, Benoit; Larroche, Olivier arXiv https://doi.org/10.48550/arxiv.1406.7108	text	January 2014
A New Generation of Los Alamos Opacity Tables Colgan, J.; Kilcrease, D. P.; Magee, N. H. arXiv https://doi.org/10.48550/arxiv.1601.01005	text	January 2016

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Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility Collins, T. J. B.; Marozas, J. A. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5039513	journal	July 2018
Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer Hu, S. X.; Theobald, W.; Radha, P. B. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5044609	journal	August 2018
Real and complex valued geometrical optics inverse ray-tracing for inline field calculations Colaïtis, A.; Palastro, J. P.; Follett, R. K. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5082951	journal	March 2019
Modeling of direct-drive cylindrical implosion experiments with an Eulerian radiation-hydrodynamics code Sauppe, J. P.; Haines, B. M.; Palaniyappan, S. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5083851	journal	April 2019
Using cylindrical implosions to investigate hydrodynamic instabilities in convergent geometry Sauppe, J. P.; Palaniyappan, S.; Loomis, E. N. Matter and Radiation at Extremes, Vol. 4, Issue 6 https://doi.org/10.1063/1.5090999	journal	November 2019
Direct-drive double-shell implosion: A platform for burning-plasma physics studies Hu, S. X.; Epstein, R.; Theobald, W. Physical Review E, Vol. 100, Issue 6 https://doi.org/10.1103/PhysRevE.100.063204	journal	December 2019

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