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Title: Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions

Abstract

Here, heat flux was measured in coronal plasmas using collective Thomson scattering from electron-plasma waves. A laser-produced plasma from a planar aluminum target created a temperature gradient along the target normal. Thomson scattering probed electron-plasma waves in the direction of the temperature gradient with phase velocities relevant to heat flux. The heat-flux measurements were reduced from classical values inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients. In regions where classical theory was invalid, the heat flux was determined by reproducing the measured Thomson-scattering spectra using electron distribution functions consistent with nonlocal thermal transport. Lastly, full-scale hydrodynamic simulations using flux-limited thermal transport (FLASH) and the multigroup nonlocal Schurtz, Nicolai, and Busquet (SNB) models both underestimated the heat flux at all locations.

Authors:
 [1];  [2];  [3];  [1]; ORCiD logo [4];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Rochester, NY (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Alberta, Edmonton, AB (Canada)
  4. CEA, DAM, DIF (France)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Laboratory for Laser Energetics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
Univ. of Rochester, NY (United States). Laboratory for Laser Energetics
OSTI Identifier:
1505767
Alternate Identifier(s):
OSTI ID: 1506062; OSTI ID: 1515343
Report Number(s):
2018-99; 1486; LLNL-JRNL-773706
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
NA0001944; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 3; Conference: 60th Annual APS Division of Plasma Physics, Portland, OR, 5-9 November 2018; 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

Citation Formats

Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Masson-Laborde, P. E., Cao, D., Palastro, J. P., and Froula, D. H. Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions. United States: N. p., 2019. Web. doi:10.1063/1.5086753.
Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Masson-Laborde, P. E., Cao, D., Palastro, J. P., & Froula, D. H. Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions. United States. doi:10.1063/1.5086753.
Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Masson-Laborde, P. E., Cao, D., Palastro, J. P., and Froula, D. H. Thu . "Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions". United States. doi:10.1063/1.5086753. https://www.osti.gov/servlets/purl/1505767.
@article{osti_1505767,
title = {Measuring heat flux from collective Thomson scattering with non-Maxwellian distribution functions},
author = {Henchen, R. J. and Sherlock, M. and Rozmus, W. and Katz, J. and Masson-Laborde, P. E. and Cao, D. and Palastro, J. P. and Froula, D. H.},
abstractNote = {Here, heat flux was measured in coronal plasmas using collective Thomson scattering from electron-plasma waves. A laser-produced plasma from a planar aluminum target created a temperature gradient along the target normal. Thomson scattering probed electron-plasma waves in the direction of the temperature gradient with phase velocities relevant to heat flux. The heat-flux measurements were reduced from classical values inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients. In regions where classical theory was invalid, the heat flux was determined by reproducing the measured Thomson-scattering spectra using electron distribution functions consistent with nonlocal thermal transport. Lastly, full-scale hydrodynamic simulations using flux-limited thermal transport (FLASH) and the multigroup nonlocal Schurtz, Nicolai, and Busquet (SNB) models both underestimated the heat flux at all locations.},
doi = {10.1063/1.5086753},
journal = {Physics of Plasmas},
number = 3,
volume = 26,
place = {United States},
year = {2019},
month = {3}
}

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