Inferring Hot-Spot Electron Temperature from X-Ray Continuum Emission

ORAL

Abstract

The measured burn-weighted hot-spot ion temperature (Ti) is used as a key implosion performance metric, but it can be biased by motional blurring. To avoid this effect, the inverse slope of the x‑ray continuum emission spectrum will be used instead to infer a hot-spot electron temperature (Te). At a chosen photon energy, this inferred Te is exactly equal to the emission-weighted harmonic mean of the hot-spot Te. Near 15-keV spectral energy, the emission weighting is closest to burn weighting. For OMEGA-scale implosions, however, simulations indicate that correlation is too poor between the inferred Te and burn-weighted Ti for Ti measurement surrogacy because of the non-equilibrium state between Te and Ti. The inferred Te will therefore be treated as an independent metric to constrain post-shot simulations. Absolute emission measurements will also be used to infer the amount of hot-spot mix. In contrast to previous methods,1,2 a non-equilibrium temperature state and the inclusion of a Te measurement will be assumed. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.

1 R. Epstein et. al., Phys. Plasmas 22, 022707 (2015).

2 T. Ma et al., Phys. Rev. Lett. 111, 085004 (2013).

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Presenters

  • Duc M Cao

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

Authors

  • Duc M Cao

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

  • Rahul C Shah

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

  • Sean P Regan

    Univ of Rochester, Univ of Rochester, Univ of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics U. of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, Rochester, New York, University of Rochester, Lab for Laser Energetics

  • Reuben Epstein

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

  • Chuck Sorce

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

  • Wolfgang R. Theobald

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

  • Radha Bahukutumbi

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

  • Valeri N Goncharov

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