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Title: Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5018000· OSTI ID:1463835

Detailed radiation hydrodynamic simulations calibrated to experimental data have been used to compare the relative strengths and weaknesses of three candidate indirect drive ablator materials now tested at the NIF: plastic, High Density Carbon (HDC) or diamond, and beryllium. We apply a common simulation methodology to several currently fielded ablator platforms to benchmark the model and extrapolate designs to the full NIF envelope to compare on a more equal footing. This paper focuses on modeling of the hohlraum energetics which accurately reproduced measured changes in symmetry when changes to the hohlraum environment were made within a given platform. Calculations suggest that all three ablator materials can achieve a symmetric implosion at a capsule outer radius of 1100 m, laser energy of 1.8 MJ, and DT ice mass of 185 g. However, there is more uncertainty in the symmetry predictions for the plastic and beryllium designs. Scaled diamond designs had the most calculated margin for achieving symmetry and the highest fuel absorbed energy at the same scale compared to plastic or beryllium. A comparison of the relative hydrodynamic stability was made using ultra-high resolution capsule simulations and the two dimensional radiation fluxes described in this work. These simulations, which include low and high mode perturbations, suggest that diamond is currently the most promising for achieving higher yields in the near future followed by plastic and more data required to understand beryllium.

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:
1463835
Alternate ID(s):
OSTI ID: 1431395
Report Number(s):
LLNL-JRNL-742613; 897326
Journal Information:
Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (11)

Octahedral spherical Hohlraum for Rev. 6 NIF beryllium capsule journal October 2018
Beryllium capsule implosions at a case-to-capsule ratio of 3.7 on the National Ignition Facility journal October 2018
Probing the seeding of hydrodynamic instabilities from nonuniformities in ablator materials using 2D velocimetry journal September 2018
Stimulated backscatter of laser light from BigFoot hohlraums on the National Ignition Facility journal January 2019
Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions journal January 2019
Improved inertial confinement fusion gamma reaction history 12 C gamma-ray signal by direct subtraction journal November 2019
A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility journal June 2019
Making inertial confinement fusion models more predictive journal August 2019
Toward a burning plasma state using diamond ablator inertially confined fusion (ICF) implosions on the National Ignition Facility (NIF) journal November 2018
Beyond alpha-heating: driving inertially confined fusion implosions toward a burning-plasma state on the National Ignition Facility journal November 2018
Modeling and projecting implosion performance for the National Ignition Facility journal December 2018

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