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Title: Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions

Abstract

Here, we report on a high convergence ratio liquid layer capsule implosion performed on the National Ignition Facility and contrast it to two previously reported layered implosions, in order to better understand how the capsule design impacts the hydrodynamic stability properties of implosions. Three implosions were performed with similar convergence ratios, fuel entropy, in-flight aspect ratios, and unablated shell mass; these qualities are important for determining hydrodynamic stability. Nevertheless, while two of these implosions exhibited robustness to asymmetries, including our recent experiment that had abnormally large amplitude long-wavelength capsule asymmetries, and produced more than 80% or the yield predicted by one-dimensional (1D) simulations, which do not account for the impacts of hydrodynamic instabilities, the third implosion produced only 14% of the yield from a 1D simulation. We perform a detailed computational analysis of these three shots, which suggests that the combination of several large asymmetry seeds result in the significantly degraded performance: a large 30 μm fill tube, the presence of a microstructure in the high density carbon ablator, and a higher level of drive asymmetry. This indicates that while it is possible to stabilize a high convergence ratio implosion through various means, the factors that determine stability cannot bemore » considered independently. Furthermore, when these asymmetries are combined in 2D simulations, they can exhibit destructive interference and underpredict the yield degradation compared to experiment and three-dimensional simulations.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1495166
Report Number(s):
LA-UR-18-30239
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Haines, Brian Michael, Olson, Richard Edward, Sweet, W., Yi, Sunghwan Austin, Zylstra, Alex B., Bradley, Paul Andrew, Elsner, F., Huang, H., Jimenez, R., Kline, John L., Kong, C., Kyrala, George Amine, Leeper, Ramon J., Paguio, R., Pajoom, S., Peterson, Robert Ross, Ratledge, M., and Rice, N. Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions. United States: N. p., 2019. Web. doi:10.1063/1.5080262.
Haines, Brian Michael, Olson, Richard Edward, Sweet, W., Yi, Sunghwan Austin, Zylstra, Alex B., Bradley, Paul Andrew, Elsner, F., Huang, H., Jimenez, R., Kline, John L., Kong, C., Kyrala, George Amine, Leeper, Ramon J., Paguio, R., Pajoom, S., Peterson, Robert Ross, Ratledge, M., & Rice, N. Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions. United States. https://doi.org/10.1063/1.5080262
Haines, Brian Michael, Olson, Richard Edward, Sweet, W., Yi, Sunghwan Austin, Zylstra, Alex B., Bradley, Paul Andrew, Elsner, F., Huang, H., Jimenez, R., Kline, John L., Kong, C., Kyrala, George Amine, Leeper, Ramon J., Paguio, R., Pajoom, S., Peterson, Robert Ross, Ratledge, M., and Rice, N. Wed . "Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions". United States. https://doi.org/10.1063/1.5080262. https://www.osti.gov/servlets/purl/1495166.
@article{osti_1495166,
title = {Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions},
author = {Haines, Brian Michael and Olson, Richard Edward and Sweet, W. and Yi, Sunghwan Austin and Zylstra, Alex B. and Bradley, Paul Andrew and Elsner, F. and Huang, H. and Jimenez, R. and Kline, John L. and Kong, C. and Kyrala, George Amine and Leeper, Ramon J. and Paguio, R. and Pajoom, S. and Peterson, Robert Ross and Ratledge, M. and Rice, N.},
abstractNote = {Here, we report on a high convergence ratio liquid layer capsule implosion performed on the National Ignition Facility and contrast it to two previously reported layered implosions, in order to better understand how the capsule design impacts the hydrodynamic stability properties of implosions. Three implosions were performed with similar convergence ratios, fuel entropy, in-flight aspect ratios, and unablated shell mass; these qualities are important for determining hydrodynamic stability. Nevertheless, while two of these implosions exhibited robustness to asymmetries, including our recent experiment that had abnormally large amplitude long-wavelength capsule asymmetries, and produced more than 80% or the yield predicted by one-dimensional (1D) simulations, which do not account for the impacts of hydrodynamic instabilities, the third implosion produced only 14% of the yield from a 1D simulation. We perform a detailed computational analysis of these three shots, which suggests that the combination of several large asymmetry seeds result in the significantly degraded performance: a large 30 μm fill tube, the presence of a microstructure in the high density carbon ablator, and a higher level of drive asymmetry. This indicates that while it is possible to stabilize a high convergence ratio implosion through various means, the factors that determine stability cannot be considered independently. Furthermore, when these asymmetries are combined in 2D simulations, they can exhibit destructive interference and underpredict the yield degradation compared to experiment and three-dimensional simulations.},
doi = {10.1063/1.5080262},
journal = {Physics of Plasmas},
number = 1,
volume = 26,
place = {United States},
year = {Wed Jan 16 00:00:00 EST 2019},
month = {Wed Jan 16 00:00:00 EST 2019}
}

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