Observation of Nonlocal Heat Flux Using Thomson Scattering

R J Henchen; M Sherlock; W Rozmus; J Katz; D Cao; J P Palastro; D H Froula

doi:10.1103/PhysRevLett.121.125001

Observation of Nonlocal Heat Flux Using Thomson Scattering

Phys Rev Lett. 2018 Sep 21;121(12):125001. doi: 10.1103/PhysRevLett.121.125001.

Authors

R J Henchen^{1

2}, M Sherlock³, W Rozmus⁴, J Katz¹, D Cao¹, J P Palastro¹, D H Froula^{1

5}

Affiliations

¹ Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
² Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.
³ Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
⁴ Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.
⁵ Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA.

PMID: 30296110
DOI: 10.1103/PhysRevLett.121.125001

Abstract

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.