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

Henchen, R. J.; Sherlock, M.; Rozmus, W.; Katz, J.; Masson-Laborde, P. E.; Cao, D.; Palastro, J. P.; Froula, D. H.

doi:10.1063/1.5086753

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

Journal Article · Thu Mar 14 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5086753· OSTI ID:1505767

Henchen, R. J. ^[1]; Sherlock, M. ^[2]; Rozmus, W. ^[3]; Katz, J. ^[4]; ^[5]; Cao, D. ^[4]; ^[4]; ^[4]

Univ. of Rochester, NY (United States); University of Rochester
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Alberta, Edmonton, AB (Canada)
Univ. of Rochester, NY (United States)
CEA, DAM, DIF (France)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Laboratory for Laser Energetics

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Univ. of Rochester, NY (United States). Laboratory for Laser Energetics

Grant/Contract Number:: AC52-07NA27344; NA0001944

OSTI ID:: 1505767

Alternate ID(s):: OSTI ID: 1506062
OSTI ID: 1515343
OSTI ID: 23079270

Report Number(s):: 1486; 2018-99; LLNL-JRNL--773706

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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