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Title: Heat transport modeling of the dot spectroscopy platform on NIF

Abstract

Electron heat transport within an inertial-fusion hohlraum plasma is difficult to model due to the complex interaction of kinetic plasma effects, magnetic fields, laser-plasma interactions, and microturbulence. In this paper, simulations using the radiation-hydrodynamic code, HYDRA, are compared to hohlraum plasma experiments which contain a Manganese–Cobalt tracer dot (Barrios et al 2016 Phys. Plasmas 23 056307). The dot is placed either on the capsule or on a film midway between the capsule and the laser-entrance hole. From spectroscopic measurements, electron temperature and position of the dot are inferred. Simulations are performed with ad hoc flux limiters of f = 0.15 and f = 0.03 (with electron heat flux, q, limited to fnT 3/2/m 1/2), and two more physical means of flux limitation: the magnetohydrodynamics and nonlocal packages. The nonlocal model agrees best with the temperature of the dot-on-film and dot-on-capsule. The hohlraum produced x-ray flux is over-predicted by roughly ~11% for the f = 0.03 model and the remaining models by ~16%. The simulated trajectories of the dot-on-capsule are slightly ahead of the experimental trajectory for all but the f = 0.03 model. The simulated dot-on-film position disagrees with the experimental measurement for all transport models. In the MHD simulationmore » of the dot-on-film, the dot is strongly perturbative, though the simulation predicts a peak dot-on-film temperature 2–3 keV higher than the measurement. Finally, this suggests a deficiency in the MHD modeling possibly due to the neglect of the Righi–Leduc term or interpenetrating flows of multiple ion species which would reduce the strength of the self-generated fields.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438678
Report Number(s):
LLNL-JRNL-742086
Journal ID: ISSN 0741-3335
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Farmer, W. A., Jones, O. S., Barrios, M. A., Strozzi, D. J., Koning, J. M., Kerbel, G. D., Hinkel, D. E., Moody, J. D., Suter, L. J., Liedahl, D. A., Lemos, N., Eder, D. C., Kauffman, R. L., Landen, O. L., Moore, A. S., and Schneider, M. B. Heat transport modeling of the dot spectroscopy platform on NIF. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaaefd.
Farmer, W. A., Jones, O. S., Barrios, M. A., Strozzi, D. J., Koning, J. M., Kerbel, G. D., Hinkel, D. E., Moody, J. D., Suter, L. J., Liedahl, D. A., Lemos, N., Eder, D. C., Kauffman, R. L., Landen, O. L., Moore, A. S., & Schneider, M. B. Heat transport modeling of the dot spectroscopy platform on NIF. United States. doi:10.1088/1361-6587/aaaefd.
Farmer, W. A., Jones, O. S., Barrios, M. A., Strozzi, D. J., Koning, J. M., Kerbel, G. D., Hinkel, D. E., Moody, J. D., Suter, L. J., Liedahl, D. A., Lemos, N., Eder, D. C., Kauffman, R. L., Landen, O. L., Moore, A. S., and Schneider, M. B. Tue . "Heat transport modeling of the dot spectroscopy platform on NIF". United States. doi:10.1088/1361-6587/aaaefd. https://www.osti.gov/servlets/purl/1438678.
@article{osti_1438678,
title = {Heat transport modeling of the dot spectroscopy platform on NIF},
author = {Farmer, W. A. and Jones, O. S. and Barrios, M. A. and Strozzi, D. J. and Koning, J. M. and Kerbel, G. D. and Hinkel, D. E. and Moody, J. D. and Suter, L. J. and Liedahl, D. A. and Lemos, N. and Eder, D. C. and Kauffman, R. L. and Landen, O. L. and Moore, A. S. and Schneider, M. B.},
abstractNote = {Electron heat transport within an inertial-fusion hohlraum plasma is difficult to model due to the complex interaction of kinetic plasma effects, magnetic fields, laser-plasma interactions, and microturbulence. In this paper, simulations using the radiation-hydrodynamic code, HYDRA, are compared to hohlraum plasma experiments which contain a Manganese–Cobalt tracer dot (Barrios et al 2016 Phys. Plasmas 23 056307). The dot is placed either on the capsule or on a film midway between the capsule and the laser-entrance hole. From spectroscopic measurements, electron temperature and position of the dot are inferred. Simulations are performed with ad hoc flux limiters of f = 0.15 and f = 0.03 (with electron heat flux, q, limited to fnT 3/2/m 1/2), and two more physical means of flux limitation: the magnetohydrodynamics and nonlocal packages. The nonlocal model agrees best with the temperature of the dot-on-film and dot-on-capsule. The hohlraum produced x-ray flux is over-predicted by roughly ~11% for the f = 0.03 model and the remaining models by ~16%. The simulated trajectories of the dot-on-capsule are slightly ahead of the experimental trajectory for all but the f = 0.03 model. The simulated dot-on-film position disagrees with the experimental measurement for all transport models. In the MHD simulation of the dot-on-film, the dot is strongly perturbative, though the simulation predicts a peak dot-on-film temperature 2–3 keV higher than the measurement. Finally, this suggests a deficiency in the MHD modeling possibly due to the neglect of the Righi–Leduc term or interpenetrating flows of multiple ion species which would reduce the strength of the self-generated fields.},
doi = {10.1088/1361-6587/aaaefd},
journal = {Plasma Physics and Controlled Fusion},
issn = {0741-3335},
number = 4,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}

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