High-Resolution X-ray Spectroscopy of a Polar Direct Drive Exploding Pusher on NIF

POSTER

Abstract

An absolutely-calibrated, high-resolution x-ray Bragg crystal spectrometer has been deployed at the National Ignition Facility (NIF) to diagnose plasma conditions in a polar direct drive exploding pusher (PDXP) implosion near stagnation. Two conical crystals focus the Kr He-α and He-β complexes onto a streak camera for time-resolved spectroscopy, and spectral intensities are calibrated via a cylindrical von Hamos crystal that time-integrates the intervening energy range between 12.8 and 15.6 keV. The evolution of electron density and temperature are inferred though Stark broadening and the relative intensities of dielectronic satellites. Results from collisional-radiative codes SCRAM and CRETIN are compared to relative and absolute line intensities and widths, which enables benchmarking of predicted plasma parameter profiles from 1D radiation hydrodynamic simulations of the PDXP platform.

Presenters

  • Brian Francis Kraus

    Princeton University, Princeton Plasma Phys Lab

Authors

  • Brian Francis Kraus

    Princeton University, Princeton Plasma Phys Lab

  • Lan Gao

    Princeton Univ, Princeton Plasma Phys Lab, Princeton University, Princeton Plasma Physics Laboratory

  • K. Wayne Hill

    Princeton Univ, Princeton Plasma Physics Lab, Princeton Plasma Phys Lab, Princeton Plasma Physics Laboratory

  • Manfred Ludwig Bitter

    Princeton Plasma Phys Lab, Princeton Plasma Physics Laboratory

  • Philip Charles Efthimion

    Princeton Plasma Physics Lab, Princeton Plasma Phys Lab, Princeton Plasma Physics Laboratory

  • Marilyn Beth Schneider

    Lawrence Livermore Natl Lab, Lawrence Livermore National Lab, Lawrence Livermore National Laboratory

  • Hui Chen

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Marion J Ayers

    Lawrence Livermore Natl Lab

  • D. A Liedahl

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Andrew G. MacPhee

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Heather D Whitley

    Lawrence Livermore Natl Lab

  • Charles Leland Ellison

    Lawrence Livermore Natl Lab, LLNL

  • Hai P. Le

    Lawrence Livermore Natl Lab

  • Ronald Bettencourt

    Lawrence Livermore Natl Lab

  • Robert L Kauffman

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • David Nelson

    Univ Rochester Lab for Laser Energetics