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Title: Analysis of NIF experiments with the minimal energy implosion model

Abstract

Here, we apply a recently developed analytical model of implosion and thermonuclear burn to fusion capsule experiments performed at the National Ignition Facility that used low-foot and high-foot laser pulse formats. Our theoretical predictions are consistent with the experimental data. Our studies, together with neutron image analysis, reveal that the adiabats of the cold fuel in both low-foot and high-foot experiments are similar. That is, the cold deuterium-tritium shells in those experiments are all in a high adiabat state at the time of peak implosion velocity. The major difference between low-foot and high-foot capsule experiments is the growth of the shock-induced instabilities developed at the material interfaces which lead to fuel mixing with ablator material. Furthermore, we have compared the NIF capsules performance with the ignition criteria and analyzed the alpha particle heating in the NIF experiments. Our analysis shows that alpha heating was appreciable only in the high-foot experiments.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1459807
Alternate Identifier(s):
OSTI ID: 1229603
Report Number(s):
LA-UR-15-23802
Journal ID: ISSN 1070-664X; PHPAEN; TRN: US1901802
Grant/Contract Number:  
AC52-06NA25396; W-7405-ENG-36
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 8; 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; energy efficiency; neutron sources; adiabatic theorem; neutrons; Richtmyer Meshkov instabilities; neutron imaging; data analysis; experiment design; inertial confinement; computer modeling

Citation Formats

Cheng, B., Kwan, T. J. T., Wang, Y. M., Merrill, F. E., Cerjan, C. J., and Batha, S. H. Analysis of NIF experiments with the minimal energy implosion model. United States: N. p., 2015. Web. doi:10.1063/1.4928093.
Cheng, B., Kwan, T. J. T., Wang, Y. M., Merrill, F. E., Cerjan, C. J., & Batha, S. H. Analysis of NIF experiments with the minimal energy implosion model. United States. doi:10.1063/1.4928093.
Cheng, B., Kwan, T. J. T., Wang, Y. M., Merrill, F. E., Cerjan, C. J., and Batha, S. H. Fri . "Analysis of NIF experiments with the minimal energy implosion model". United States. doi:10.1063/1.4928093. https://www.osti.gov/servlets/purl/1459807.
@article{osti_1459807,
title = {Analysis of NIF experiments with the minimal energy implosion model},
author = {Cheng, B. and Kwan, T. J. T. and Wang, Y. M. and Merrill, F. E. and Cerjan, C. J. and Batha, S. H.},
abstractNote = {Here, we apply a recently developed analytical model of implosion and thermonuclear burn to fusion capsule experiments performed at the National Ignition Facility that used low-foot and high-foot laser pulse formats. Our theoretical predictions are consistent with the experimental data. Our studies, together with neutron image analysis, reveal that the adiabats of the cold fuel in both low-foot and high-foot experiments are similar. That is, the cold deuterium-tritium shells in those experiments are all in a high adiabat state at the time of peak implosion velocity. The major difference between low-foot and high-foot capsule experiments is the growth of the shock-induced instabilities developed at the material interfaces which lead to fuel mixing with ablator material. Furthermore, we have compared the NIF capsules performance with the ignition criteria and analyzed the alpha particle heating in the NIF experiments. Our analysis shows that alpha heating was appreciable only in the high-foot experiments.},
doi = {10.1063/1.4928093},
journal = {Physics of Plasmas},
number = 8,
volume = 22,
place = {United States},
year = {2015},
month = {8}
}

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