Transport of Energy by Laser-Generated Fast Electrons within Cone-wire Targets

ORAL

Abstract

Coupling of energy via laser accelerated electrons to 10 to 40$\mu $m diameter Cu wires attached to Al cones irradiated by a 500J, 1ps, f/3 focused laser is studied as a surrogate for fast ignition. Cu Ka images were recorded using a Bragg crystal imager. Ka yield was obtained with a single hit CCD and relative intensities in Cu K-shell spectra were recorded with a HOPG crystal spectrometer. Fitting 1D numerical modeling to axial profiles of Ka emission estimates the coupling efficiency and the average temperature of the electrons in the 1D Ohmically inhibited energy transport.

*This work was performed under the auspices of U.S. DOE under contracts DE-FC02-04ER54789, DE-FG02-05ER54834, DE-FG03-00ER54606. The authors kindly acknowledge the support of ILSA at LLNL

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Authors

  • J. King

    • Department of Mechanical and Aerospace Engineering, University of California-San Diego
    • Department of Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, CA

  • T.Y. Ma

    • University of California-San Diego
    • Department of Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, CA

  • F.N. Beg

    • UCSD
    • Department of Mechanical and Aerospace Engineering, University of California San Diego
    • U.C. San Diego, Mechanical and Aerospace Engineering, La Jolla CA
    • University of California-San Diego
    • Department of Mechanical and Aerospace Engineering, University of California-San Diego
    • Department of Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, CA

  • M. Key

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore CA 94550
    • Lawrence Livermore National Lab

  • J.A. Koch

    • Lawrence Livermore National Laboratory

  • A.J. Mackinnon

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore CA 94550

  • A.G. Macphee

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore CA 94550
    • Lawrence Livermore National Lab

  • P. Patel

    • Lawrence Livermore National Lab, Livermore CA

  • R. Stephens

    • General Atomics, San Diego CA

  • K. Akli

  • R. Freeman

    • The Ohio State University
    • College of Mathematical and Physical Sciences, The Ohio State University, Columbus, OH

  • L. Van Woerkom

    • Ohio State University, Columbus OH
    • The Ohio State University
    • College of Mathematical and Physical Sciences, Ohio State University
    • College of Mathematical and Physical Sciences, The Ohio State University, Columbus, OH

  • R. Heathcote

  • K. Lancaster

    • STFC Rutherford Appleton Laboratory

  • P. Norreys

    • Rutherford Appelton Laboratory
    • Rutherford Appleton Lab, Chilton, Oxon, OX11OQX, UK

  • R.J. Mason

    • Research Applications Corp., Los Alamos NM

  • W. Theobald

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