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

Abstract

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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1604025
Report Number(s):
LA-UR-19-20184
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

Citation Formats

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, and Schmidt, Derek William. Observation of persistent species temperature separation in inertial confinement fusion mixtures. United States: N. p., 2020. Web. doi:10.1038/s41467-020-14412-y.
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. Observation of persistent species temperature separation in inertial confinement fusion mixtures. United States. doi:10.1038/s41467-020-14412-y.
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, and Schmidt, Derek William. Tue . "Observation of persistent species temperature separation in inertial confinement fusion mixtures". United States. doi:10.1038/s41467-020-14412-y. https://www.osti.gov/servlets/purl/1604025.
@article{osti_1604025,
title = {Observation of persistent species temperature separation in inertial confinement fusion mixtures},
author = {Haines, Brian Michael and Shah, Rahul C and Smidt, Joseph Michael and Albright, Brian James and Cardenas, Tana and Douglas, Melissa Rae and Forrest, Chad and Glebov, Vladimir Yu and Gunderson, Mark A. and Hamilton, Christopher Eric and Henderson, Kevin C. and Kim, Yong Ho and Lee, Matthew Nicholson and Murphy, Thomas Joseph and Oertel, John A. and Olson, Richard Edward and Patterson, Brian M. and Randolph, Randall Blaine and Schmidt, Derek William},
abstractNote = {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.},
doi = {10.1038/s41467-020-14412-y},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {1}
}

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