Absorption Measurements Validate the Langdon Factor and Discriminate Between Coulomb Logarithms

ORAL

Abstract

Inverse-bremsstrahlung absorption was measured based on transmission through a finite-length plasma that was well characterized using imaging Thomson scattering. Expected absorption was calculated using the diagnosed plasma conditions while varying the Coulomb logarithm treatment and the use of the Langdon absorption-reduction factor. The experimental data are well reproduced only when using both the Langdon factor and the Johnston-Dawson Coulomb logarithm. The Lee-More Coulomb logarithm—which is widely used in radiation-hydrodynamics codes to simulate inertial confinement fusion implosions—predicts almost 50% more absorption than was observed.

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.

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Publication: D. Turnbull et al., "Absorption Measurements Validate the Langdon Factor and Discriminate Between Coulomb Logarithms," in preparation to be submitted to Physical Review Letters.

Presenters

  • David Turnbull

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

Authors

  • David Turnbull

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Joseph D Katz

    • University of Rochester - Laboratory for Laser Energetics
    • University of Rochester Laboratory for Laser Energetics
    • Laboratory for Laser Energetics
    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Avram L Milder

    • University of Alberta

  • Mark Sherlock

    • Lawrence Livermore Natl Lab

  • David J Strozzi

    • Lawrence Livermore Natl Lab
    • LLNL

  • William Armstrong

    • University of Rochester Laboratory for Laser Energetics

  • Laurent Divol

    • Lawrence Livermore Natl Lab
    • LLNL

  • Dana H Edgell

    • LLE
    • Laboratory for Laser Energetics
    • University of Rochester

  • Russell K Follett

    • Laboratory for Laser Energetics - Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Suxing Hu

    • Laboratory for Laser Energetics, University of Rochester
    • LLE
    • University of Rochester
    • Lab. for Laser Energetics, U. of Rochester

  • Pierre A Michel

    • Lawrence Livermore National Laboratory, Livermore CA 94550
    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Dustin Froula

    • University of Rochester
    • Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics, University of Rochester