\textbf{Pulse Designs Varying Hot-Electron Production for Direct-Drive Inertial Confinement Fusion Implosions OMEGA Utilizing the SG5-650 Phase Plates}

ORAL

Abstract

New ``SG5-650'' phase plates ($R_{\mathrm{95}}$~$=$~325 $\mu $m) to complement the ``SG5-850's'' (R$_{\mathrm{95}}$~$=$~425~$\mu $m) have been fielded on OMEGA. The SG5-650 phase plates allow for the reduction of cross-beam energy transfer (CBET) effects by decreasing the R$_{\mathrm{beam}}$/R$_{\mathrm{target}}$. However, preheating from increased hot-electron production can occur as the net overlapped intensity increases. To experimentally evaluate this trade-off's impact on cryogenic implosion performance, pulse shapes were designed that gave approximately equal 1-D performance but the main drive power history was adjusted to provide different quarter-critical intensity levels and therefore different levels of hot-electron production. Hot-electron production levels were experimentally verified by using the hard x-ray diagnostic when shooting the pulses on warm plastic targets. In a future experiment utilizing the SG5-650 phase plates, an intensity scan will be used to study the effect of preheating on a 0.8x hydro scale of the best-performing implosion that utilized the SG5-850 phase plates.

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number Abstract DE-NA0003856

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Authors

  • D. Cao

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

  • D. Patel

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

  • M.J. Rosenberg

    • U. of Rochester's Laboratory for Laser Energetics
    • LLE
    • University of Rochester, Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics
    • University of Rochester

  • Wolfgang Theobald

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

  • C. Thomas

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

  • A.R. Christopherson

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

  • C. Stoeckl

    • University of Rochester
    • University of Rochester - LLE
    • Laboratory for Laser Energetics, University of Rochester
    • Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, U. of Rochester
    • University of Rochester, NY 14623, USA

  • Sean Regan

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

  • I.V. Igumenshchev

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

  • Riccrado Betti

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

  • Radha Bahukutumbi

    • LLE
    • University of Rochester
    • University of Rochester - LLE
    • Laboratory for Laser Energetics, University of Rochester
    • Laboratory for laser Energetics, University of Rochester
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics

  • V. N. Goncharov

    • Laboratory for Laser Energetics
    • University of Rochester, Laboratory for Laser Energetics
    • University of Rochester - LLE
    • Laboratory for Laser Energetics, University of Rochester
    • Laboratory for Laser Energetics, U. of Rochester
    • University of Rochester
    • Laboratory for laser Energetics, University of Rochester