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Mix, Temperature and Compression of Statistical Model Optimized Cryogenic Implosions

ORAL

Abstract

We report on the x-ray continuum inferred mix, temperature and compression of direct-drive DT cryogenic layered implosions on OMEGA that were optimized with a statistical model.[1] The x-ray measurement is obtained from a new four-channel, differentially filtered pinhole imager recorded on calibrated image plate, from which an electron temperature and absolute yield are determined. The mix analysis is based on a ratio of measured x-ray and neutron yields.[2] The influence of nonequilibration of electrons and ions in the hot spot is interpreted from a database of 2‑D radiation-hydrodynamic simulations. Within limits of a few percent by atom CD (imposed by the nonequilibrium conditions), we do not find indications of hot-spot mix over the range of typically accessed implosions for highest ignition-relevant performance. The bremsstrahlung temperature and line-integrated amplitude are also spatially resolved and compared to an identical analysis of the 2-D simulation (accounting for beam geometry, laser imprint, and cryogenic layer roughness). The results suggest that our current models do not yet explain the limitations on hot-spot compression. 
 
[1] V. Gopalaswamy et al., Nature 565, 581 (2019).


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

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Presenters

  • Rahul C Shah

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

Authors

  • Rahul C Shah

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

  • Duc M Cao

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

  • Riccardo Betti

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

  • Reuben Epstein

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

  • Varchas Gopalaswamy

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

  • Michael J Rosenberg

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

  • Wolfgang R Theobald

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

  • Sean P Regan

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

  • Petr L Volegov

    Los Alamos National Laboratory

  • Benjamin Bachmann

    Lawrence Livermore Natl Lab, LLNL