Ultrafast Thomson Scattering and the Effects of Collisions on the Electron Plasma Wave Feature

ORAL

Abstract

Thomson-scattering spectra from collisional electron plasma waves were measured in an underdense (∼1019 cm–3) H2 plasma irradiated by a 60-ps, 1053-nm laser pulse with an intensity of ∼2 × 1014 W/cm2. The picosecond-resolved spectra were obtained with a novel pulse-front–tilt compensated streaked optical spectrometer. The Thomson scattering spectrum provides a measure of the electron temperature and density and show that the temperature heats from 5 eV to 20 eV over the first 20 ps. Over this time the density increases from 0.8 × 1019 cm–3 to its plateau at 1.1 × 1019 cm–3. The temperature plateaus after 40 ps at ∼100 eV. The Thomson spectra have been compared to a collisionless Thomson-scattering model, a Bhatnagar–Gross–Krook model, and a solution of the Landau kinetic equation that includes collision integrals.

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944 and the U.S. Department of Energy Office of Fusion Energy Sciences under contract no. DE-SC0016253.

–

Presenters

  • A. S. Davies

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

Authors

  • A. S. Davies

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

  • Joe Katz

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

  • S. Bucht

    • Laboratory for Laser Energetics, U. of Rochester

  • Daniel J Haberberger

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

  • W. Rozmus

    • Department of Physics, University of Alberta, Edmonton, Canada
    • University of Alberta
    • Univ of Alberta
    • Department of Physics, U. of Alberta

  • John P. Palastro

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

  • Ildar A. Begishev

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

  • Jessie L. Shaw

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

  • David Turnbull

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

  • Robert Boni

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

  • Dustin H Froula

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