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Title: Investigation of heat transport using directly driven gold spheres

Abstract

Recently, heat transport was investigated using a directly driven beryllium sphere [Farmer et al., Phys. Plasmas 27, 082701 (2020)]. Models that overly restrict heat transport were rejected. This paper extends work to directly driven gold spheres where radiation loss is more important. Here, gold coated spheres are directly driven at the OMEGA laser facility at intensities of 5×1014 W/cm2. Plasma conditions, laser coupling, and x-ray flux are all measured. Additionally, comparisons to 2D radiation-hydrodynamic simulations are performed. Simulations use three common heat transport models: local transport with flux limiters of f = 0.15 and f = 0.03, and the nonlocal Schurtz–Nicolai–Busquet (SNB) model. It is shown that both the SNB model and f = 0.15 match the measured plasma conditions with the SNB model better capturing the temporal evolution of electron temperature. The f = 0.03 model predicts too low of an electron density and too hot of a temperature. The measured scattered light is roughly 6% of the incident energy, the f = 0.15 and SNB models predict 0.5% uncoupled light, and f = 0.03, 38% uncoupled light. The x-ray fluxes in the f = 0.15 and SNB simulations rise too quickly and are just outside the measurement's error,more » while the x-ray flux in the f = 0.03 simulation is low by a factor of two-three. For these reasons, the f = 0.03 model is rejected.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [1];  [1]; ORCiD logo [4]; ORCiD logo [4];  [1]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Alberta, Edmonton, AB (Canada)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Alberta, Edmonton, AB (Canada)
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1777337
Alternate Identifier(s):
OSTI ID: 1970621
Report Number(s):
LLNL-JRNL-817605
Journal ID: ISSN 1070-664X; 1027293; TRN: US2209440
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 28; 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; Thermodynamic states and processes; geometrical optics; radiation losses; streak cameras; plasma waves; Thomson scattering; laser coupling; hydrodynamics simulations

Citation Formats

Farmer, W. A., Rosen, M. D., Swadling, G. F., Bruulsema, C., Harris, C. D., Rozmus, W., Schneider, M. B., Sherlock, M. W., Edgell, D. H., Katz, J., and Ross, J. S. Investigation of heat transport using directly driven gold spheres. United States: N. p., 2021. Web. doi:10.1063/5.0040320.
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Farmer, W. A., Rosen, M. D., Swadling, G. F., Bruulsema, C., Harris, C. D., Rozmus, W., Schneider, M. B., Sherlock, M. W., Edgell, D. H., Katz, J., & Ross, J. S. Investigation of heat transport using directly driven gold spheres. United States. https://doi.org/10.1063/5.0040320
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Farmer, W. A., Rosen, M. D., Swadling, G. F., Bruulsema, C., Harris, C. D., Rozmus, W., Schneider, M. B., Sherlock, M. W., Edgell, D. H., Katz, J., and Ross, J. S. Mon . "Investigation of heat transport using directly driven gold spheres". United States. https://doi.org/10.1063/5.0040320. https://www.osti.gov/servlets/purl/1777337.
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@article{osti_1777337,
title = {Investigation of heat transport using directly driven gold spheres},
author = {Farmer, W. A. and Rosen, M. D. and Swadling, G. F. and Bruulsema, C. and Harris, C. D. and Rozmus, W. and Schneider, M. B. and Sherlock, M. W. and Edgell, D. H. and Katz, J. and Ross, J. S.},
abstractNote = {Recently, heat transport was investigated using a directly driven beryllium sphere [Farmer et al., Phys. Plasmas 27, 082701 (2020)]. Models that overly restrict heat transport were rejected. This paper extends work to directly driven gold spheres where radiation loss is more important. Here, gold coated spheres are directly driven at the OMEGA laser facility at intensities of 5×1014 W/cm2. Plasma conditions, laser coupling, and x-ray flux are all measured. Additionally, comparisons to 2D radiation-hydrodynamic simulations are performed. Simulations use three common heat transport models: local transport with flux limiters of f = 0.15 and f = 0.03, and the nonlocal Schurtz–Nicolai–Busquet (SNB) model. It is shown that both the SNB model and f = 0.15 match the measured plasma conditions with the SNB model better capturing the temporal evolution of electron temperature. The f = 0.03 model predicts too low of an electron density and too hot of a temperature. The measured scattered light is roughly 6% of the incident energy, the f = 0.15 and SNB models predict 0.5% uncoupled light, and f = 0.03, 38% uncoupled light. The x-ray fluxes in the f = 0.15 and SNB simulations rise too quickly and are just outside the measurement's error, while the x-ray flux in the f = 0.03 simulation is low by a factor of two-three. For these reasons, the f = 0.03 model is rejected.},
doi = {10.1063/5.0040320},
journal = {Physics of Plasmas},
number = 3,
volume = 28,
place = {United States},
year = {Mon Mar 15 00:00:00 EDT 2021},
month = {Mon Mar 15 00:00:00 EDT 2021}
}
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