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.

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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