\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.

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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