Experimental Demonstration of 3D Hot-spot Shape Symmetry Control in Laser Direct-Drive Inertial Confinement Fusion Implosions

ORAL

Abstract

The OMEGA laser facility has demonstrated the feasibility of achieving symmetric implosions through corrective on-target laser energy adjustments. The symmetry control experiment applied a real-time (between shots) machine-learning based 3D reconstruction of hot-spot plasma emissivity from multi-angle x-ray imaging. This enabled quantification of the magnitude and orientation of low-mode (L = 1-2) asymmetries, which were separately seeded by a 40-μm target offset and a shimmed shell with 3-μm thickness variation along the polar axis. The large L = 2 prolate asymmetry was successfully mitigated, while the mitigation of L = 1 asymmetry was also observed. The methodology of controlling 3D low-mode hot-spot shape asymmetries through on-target laser energy adjustments and 3D reconstruction is being integrated with an artificial intelligence system, aiming to achieve symmetric and high-performance implosions. Three major frameworks are developed, including an evolutionary optimization that generates optimal laser pulse shapes achieving high measured yields of 1.82E14, a convolutional neural network model for fast (between shots) 3D tomography of hot-spot and shell structures, and a quantum-inspired data analysis model identifying correlations between input non-uniformities and measured hot-spot flow asymmetries.

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Presenters

  • Ka Ming Woo

    Laboratory for Laser Energetics, University of Rochester

Authors

  • Ka Ming Woo

    Laboratory for Laser Energetics, University of Rochester

  • Kristen Churnetski

    University of Rochester

  • Riccardo Betti

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energy, Rochester, NY, USA.

  • Christian Stoeckl

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

  • Cliff A Thomas

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, University of Rochester Laboratory for Laser Energetics (LLE)

  • Timothy J Collins

    Laboratory for Laser Energetics, University of Rochester

  • Luke A Ceurvorst

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

  • Siddharth Sampat

    Laboratory for Laser Energetics

  • Varchas Gopalaswamy

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics - Rochester

  • Aarne Lees

    University of Rochester - Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester

  • Steven T Ivancic

    Lab for Laser Energetics

  • Michael Michalko

    Laboratory for Laser Energetics

  • James P Knauer

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

  • Duc M Cao

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

  • Kenneth S Anderson

    Laboratory for Laser Energetics, University of Rochester

  • Alexander Shvydky

    Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester - Laboratory for Laser Energetics

  • Rahul C Shah

    Laboratory for Laser Energetics - Rochester, University of Rochester - Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester

  • Peter V Heuer

    Laboratory for Laser Energetics

  • Sean P Regan

    Laboratory for Laser Energetics, University of Rochester

  • Michael J Rosenberg

    University of Rochester Laboratory for Laser Energetics (LLE), Laboratory for Laser Energetics, University of Rochester, University of Rochester