Heat transport modeling of the dot spectroscopy platform on NIF

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.

doi:10.1088/1361-6587/aaaefd

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

Journal Article · Tue Feb 13 00:00:00 EST 2018 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aaaefd· OSTI ID:1438678

^[1];

^[1]; Barrios, M. A. ^[1]; Strozzi, D. J. ^[1]; Koning, J. M. ^[1]; Kerbel, G. D. ^[1]; Hinkel, D. E. ^[1]; Moody, J. D. ^[1]; Suter, L. J. ^[1]; Liedahl, D. A. ^[1]; Lemos, N. ^[1]; Eder, D. C. ^[1]; Kauffman, R. L. ^[1]; Landen, O. L. ^[1]; Moore, A. S. ^[1]; Schneider, M. B. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1438678

Report Number(s):: LLNL-JRNL-742086

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 60, Issue 4; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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