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Title: Observation of Nonlocal Heat Flux Using Thomson Scattering

Abstract

Here, nonlocal heat flux was measured in laser-produced coronal plasmas using a novel Thomson scattering technique. The measured heat flux was smaller than the classical values inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients. Vlasov–Fokker–Planck simulations self consistently calculated the electron distribution functions used to reproduce the measured Thomson scattering spectra and to determine the heat flux. Multigroup nonlocal simulations overestimated the measured heat flux.

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [5]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Dept. of Mechanical Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  5. Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); New York State Energy Research and Development Authority (NYSERDA)
OSTI Identifier:
1476314
Alternate Identifier(s):
OSTI ID: 1471267; OSTI ID: 1497288
Report Number(s):
2018-71; 1435; LLNL-JRNL-750862
Journal ID: ISSN 0031-9007; PRLTAO; 2018-71, 2394, 1436
Grant/Contract Number:  
NA0001944; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 12; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS; classical transport; plasma transport; Fokker-Planck and Vlasov model; light scattering

Citation Formats

Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Cao, D., Palastro, J. P., and Froula, D. H. Observation of Nonlocal Heat Flux Using Thomson Scattering. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.125001.
Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Cao, D., Palastro, J. P., & Froula, D. H. Observation of Nonlocal Heat Flux Using Thomson Scattering. United States. doi:10.1103/PhysRevLett.121.125001.
Henchen, R. J., Sherlock, M., Rozmus, W., Katz, J., Cao, D., Palastro, J. P., and Froula, D. H. Tue . "Observation of Nonlocal Heat Flux Using Thomson Scattering". United States. doi:10.1103/PhysRevLett.121.125001. https://www.osti.gov/servlets/purl/1476314.
@article{osti_1476314,
title = {Observation of Nonlocal Heat Flux Using Thomson Scattering},
author = {Henchen, R. J. and Sherlock, M. and Rozmus, W. and Katz, J. and Cao, D. and Palastro, J. P. and Froula, D. H.},
abstractNote = {Here, nonlocal heat flux was measured in laser-produced coronal plasmas using a novel Thomson scattering technique. The measured heat flux was smaller than the classical values inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients. Vlasov–Fokker–Planck simulations self consistently calculated the electron distribution functions used to reproduce the measured Thomson scattering spectra and to determine the heat flux. Multigroup nonlocal simulations overestimated the measured heat flux.},
doi = {10.1103/PhysRevLett.121.125001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 12,
volume = 121,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: (a) Calculated Thomson-scattering features (orange, right axis) from electron plasma waves (Eq. 1) are shown (vφ = ω/k) using a Maxwellian (solid blue, left axis) electron distribution function and the non-Maxwellian (dashed blue) distribution that accounts for classical SH heat flux (λei/LT = 2.2× 10−3, q/qFS = 3%).more » (b) For a fixed normalized phase velocity, the ratio (R) of the peak scattered power of the up- and downshifted features are shown for calculations that use classical SH (dashed curve, top axis) and nonlocal (solid curve, bottom axis) distribution functions over a range of heat flux normalized to the free-streaming flux, qFS = neTevte.« less

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