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Title: Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube

Abstract

The micrometer-scale tube that fills capsules with thermonuclear fuel in inertial confinement fusion experiments at the National Ignition Facility is also one of the implosion's main degradation sources. It seeds a perturbation that injects the ablator material into the center, radiating away some of the hot-spot energy. This paper discusses how the perturbation arises in experiments using high-density carbon ablators and how the ablator mix interacts once it enters the hot-spot. Both modeling and experiments show an in-flight areal-density perturbation and localized x-ray emission at stagnation from the fill-tube. Simulations suggest that the fill-tube is degrading an otherwise 1D implosion by ~2×, but when other degradation sources are present, the yield reduction is closer to 20%. Characteristics of the fill-tube assembly, such as the through-hole size and the glue mass, alter the dynamics and magnitude of the degradation. Overall, these aspects point the way toward improvements in the design, some of which (smaller diameter fill-tube) have already shown improvements.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [1];  [3]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1] more »;  [2];  [1];  [1] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); LULI-CNRS Ecole Polytechnique, Univ. Paris-Saclay, Palaiseau (France)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1669246
Alternate Identifier(s):
OSTI ID: 1602892
Report Number(s):
LLNL-JRNL-786080
Journal ID: ISSN 1070-664X; 979070
Grant/Contract Number:  
AC52-07NA27344; NA0001808
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 3; 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; Radiation flux; plasmas; Bremsstrahlung; radiography; fusion experiments; emission spectroscopy; shock waves; nuclear fusion; hydrodynamics simulations

Citation Formats

Weber, C. R., Clark, D. S., Pak, A., Alfonso, N., Bachmann, B., Berzak Hopkins, L. F., Bunn, T., Crippen, J., Divol, L., Dittrich, T., Kritcher, A. L., Landen, O. L., Le Pape, S., MacPhee, A. G., Marley, E., Masse, L. P., Milovich, J. L., Nikroo, A., Patel, P. K., Pickworth, L. A., Rice, N., Smalyuk, V. A., and Stadermann, M.. Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube. United States: N. p., 2020. Web. https://doi.org/10.1063/1.5125599.
Weber, C. R., Clark, D. S., Pak, A., Alfonso, N., Bachmann, B., Berzak Hopkins, L. F., Bunn, T., Crippen, J., Divol, L., Dittrich, T., Kritcher, A. L., Landen, O. L., Le Pape, S., MacPhee, A. G., Marley, E., Masse, L. P., Milovich, J. L., Nikroo, A., Patel, P. K., Pickworth, L. A., Rice, N., Smalyuk, V. A., & Stadermann, M.. Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube. United States. https://doi.org/10.1063/1.5125599
Weber, C. R., Clark, D. S., Pak, A., Alfonso, N., Bachmann, B., Berzak Hopkins, L. F., Bunn, T., Crippen, J., Divol, L., Dittrich, T., Kritcher, A. L., Landen, O. L., Le Pape, S., MacPhee, A. G., Marley, E., Masse, L. P., Milovich, J. L., Nikroo, A., Patel, P. K., Pickworth, L. A., Rice, N., Smalyuk, V. A., and Stadermann, M.. Wed . "Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube". United States. https://doi.org/10.1063/1.5125599. https://www.osti.gov/servlets/purl/1669246.
@article{osti_1669246,
title = {Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube},
author = {Weber, C. R. and Clark, D. S. and Pak, A. and Alfonso, N. and Bachmann, B. and Berzak Hopkins, L. F. and Bunn, T. and Crippen, J. and Divol, L. and Dittrich, T. and Kritcher, A. L. and Landen, O. L. and Le Pape, S. and MacPhee, A. G. and Marley, E. and Masse, L. P. and Milovich, J. L. and Nikroo, A. and Patel, P. K. and Pickworth, L. A. and Rice, N. and Smalyuk, V. A. and Stadermann, M.},
abstractNote = {The micrometer-scale tube that fills capsules with thermonuclear fuel in inertial confinement fusion experiments at the National Ignition Facility is also one of the implosion's main degradation sources. It seeds a perturbation that injects the ablator material into the center, radiating away some of the hot-spot energy. This paper discusses how the perturbation arises in experiments using high-density carbon ablators and how the ablator mix interacts once it enters the hot-spot. Both modeling and experiments show an in-flight areal-density perturbation and localized x-ray emission at stagnation from the fill-tube. Simulations suggest that the fill-tube is degrading an otherwise 1D implosion by ~2×, but when other degradation sources are present, the yield reduction is closer to 20%. Characteristics of the fill-tube assembly, such as the through-hole size and the glue mass, alter the dynamics and magnitude of the degradation. Overall, these aspects point the way toward improvements in the design, some of which (smaller diameter fill-tube) have already shown improvements.},
doi = {10.1063/1.5125599},
journal = {Physics of Plasmas},
number = 3,
volume = 27,
place = {United States},
year = {2020},
month = {3}
}

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