Quantifying the effects of neutron scattering for neutron yield isotropy measurements at the NIF

POSTER

Abstract

The neutron yield diagnostics at the NIF have been upgraded to include 48 detectors placed around the NIF target chamber to assess the DT neutron yield isotropy for inertial confinement fusion experiments. The real-time neutron-activation detectors (RT-NADs) are used to understand yield asymmetries due to variations in the fuel and ablator areal densities, Doppler shifts in the neutron energy due to hotspot motion, and other physics effects. In order to isolate target physics effects, we must understand the contribution due to neutron scattering associated with the different hardware configurations used for each experiment. Our goal is to achieve 1{\%} or better precision in determining the yield isotropy. We present Monte Carlo simulations and experimental measurements to quantify this impact.

Authors

  • Kelly Hahn

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, LLNL

  • Richard Bionta

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • H. Khater

    Lawrence Livermore National Laboratory

  • E. A. Henry

    Lawrence Livermore National Laboratory

  • Alastair Moore

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory, LLNL

  • D. J. Schlossberg

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • D. A. Barker

    Lawrence Livermore National Laboratory

  • E. R. Casco

    Lawrence Livermore National Laboratory

  • R. B. Ehrlich

    Lawrence Livermore National Laboratory

  • J. M. Gjemso

    Lawrence Livermore National Laboratory

  • A. B. Golod

    Lawrence Livermore National Laboratory

  • Gary Grim

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Edward Hartouni

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Shaun Kerr

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory