Open L-Shell Spectroscopy of Non-local Thermodynamic Equilibrium Plasmas

POSTER

Abstract

Spectral modeling codes are commonly used to infer plasma conditions from measured spectra. However, at non-local thermodynamic equilibrium conditions common in high-energy-density environments, such models produce conflicting results for open-shell systems. Improving the underlying atomic models would improve inference capabilities in such systems, particularly for employing L-shell spectra as a sensitive density diagnostic where traditional K-shell techniques are limited. To begin to provide high-quality data that can discriminate between spectral codes, we present results of time-resolved, open L-shell Ge spectroscopy from Ge and Sc buried layers in 10-$\mu $m-thick Be irradiated by the OMEGA laser. Time-resolved temperature and density are constrained by Sc K-shell spectra and images of the emitting volume. Comparisons to the spectral model SCRAM are explored. This platform will enable systematic measurement of high-resolution, temporally-resolved spectra of open L-shell mid-$Z$ elements.

Authors

  • David Bishel

    Laboratory for Laser Energetics, U. of Rochester

  • Phil Nilson

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

  • Gilbert Collins

    Lab for Laser Energetics, Laboratory for Laser Energetics, Laboratory for Laser Energetics, U. of Rochester

  • Edward Marley

    LLNL

  • M.B. Schneider

    Lawrence Livermore Natl Lab, LLNL

  • Duane Liedahl

    Lawrence Livermore National Laboratory, LLNL

  • RF Heeter

    Lawrence Livermore National Laboratory, LLNL, Lawrence Livermore Natl Laboratory, Lawrence Livermore Natl Lab, Lawrence Livermore Natl. Lab

  • Mark Foord

    LLNL

  • Gregory Kemp

    LLNL

  • Yechiel Frank

    LLNL

  • J Emig

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Laboratory, Lawrence Livermore Natl. Lab

  • Gabriel Perez Callejo

    University of Oxford, Dept. of Physics, Clarendon Laboratory, U. of Oxford