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Title: Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators

Abstract

Here, the U.S. indirect drive inertial confinement fusion (ICF) program uses glow discharge polymer (GDP) as one of the ablator materials for the ICF experiments at the National Ignition Facility (NIF). The performance of those implosions may be adversely affected by photoactivated uptake of oxygen impurities in the surface of the GDP ablator. These impurities can induce significant perturbations in the shock waves generated in the ablator. These perturbed shocks generate mass modulations that are amplified by Rayleigh-Taylor (RT) instability and reduce the performance of the implosions. Here we report on experiments that provide a quantitative connection between photoactivated oxygen uptake in GDP samples and modulations in shock velocities in the samples. The observed shock nonuniformity confirms the hypothesis that irregular oxygenation is a competent seed for the RT and can have a significant effect on NIF GDP implosions.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1];  [3];  [1];  [1];  [3];  [3];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1480414
Alternate Identifier(s):
OSTI ID: 1470592
Report Number(s):
LLNL-JRNL-743558
Journal ID: ISSN 2470-0045; PLEEE8; 898666
Grant/Contract Number:  
AC52-07NA27344; NA0001808
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 3; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ali, S. J., Celliers, P. M., Haan, S. W., Boehly, T. R., Whiting, N., Baxamusa, S. H., Reynolds, H., Johnson, M. A., Hughes, J. D., Watson, B., Engelhorn, K., Smalyuk, V. A., and Landen, O. L. Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators. United States: N. p., 2018. Web. doi:10.1103/PhysRevE.98.033204.
Ali, S. J., Celliers, P. M., Haan, S. W., Boehly, T. R., Whiting, N., Baxamusa, S. H., Reynolds, H., Johnson, M. A., Hughes, J. D., Watson, B., Engelhorn, K., Smalyuk, V. A., & Landen, O. L. Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators. United States. doi:10.1103/PhysRevE.98.033204.
Ali, S. J., Celliers, P. M., Haan, S. W., Boehly, T. R., Whiting, N., Baxamusa, S. H., Reynolds, H., Johnson, M. A., Hughes, J. D., Watson, B., Engelhorn, K., Smalyuk, V. A., and Landen, O. L. Thu . "Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators". United States. doi:10.1103/PhysRevE.98.033204. https://www.osti.gov/servlets/purl/1480414.
@article{osti_1480414,
title = {Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators},
author = {Ali, S. J. and Celliers, P. M. and Haan, S. W. and Boehly, T. R. and Whiting, N. and Baxamusa, S. H. and Reynolds, H. and Johnson, M. A. and Hughes, J. D. and Watson, B. and Engelhorn, K. and Smalyuk, V. A. and Landen, O. L.},
abstractNote = {Here, the U.S. indirect drive inertial confinement fusion (ICF) program uses glow discharge polymer (GDP) as one of the ablator materials for the ICF experiments at the National Ignition Facility (NIF). The performance of those implosions may be adversely affected by photoactivated uptake of oxygen impurities in the surface of the GDP ablator. These impurities can induce significant perturbations in the shock waves generated in the ablator. These perturbed shocks generate mass modulations that are amplified by Rayleigh-Taylor (RT) instability and reduce the performance of the implosions. Here we report on experiments that provide a quantitative connection between photoactivated oxygen uptake in GDP samples and modulations in shock velocities in the samples. The observed shock nonuniformity confirms the hypothesis that irregular oxygenation is a competent seed for the RT and can have a significant effect on NIF GDP implosions.},
doi = {10.1103/PhysRevE.98.033204},
journal = {Physical Review E},
number = 3,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

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