Electron Generation and Transport as a Function of Preplasma in Cone-Attached Targets

ORAL

Abstract

The underlying physics of laser energy deposition and transport in cone-guided fast ignition is very complex. It has been shown recently that preplasma can significantly affect the generation and transport of electrons in cone targets.\footnote{S. D. Baton, et al., Phys. Plasmas \textbf{15}, 042706 (2008).}$^{,}$\footnote{L. Van Woerkom, et al., Phys. Plasmas \textbf{15}, 056304 (2008).} In integrated FI, prepulse energies of the order of 1 J are expected. Experiments have been performed at the Titan laser (10$^{20}$ W/cm$^{2})$ at LLNL in which prepulse levels were artificially induced at levels of up to 1 J using the long pulse beam into cone-wire targets. By simultaneously using Cu K$\alpha$ imaging, single photon counting cameras, and HOPG crystal spectroscopy, absolute information of spatially resolved K$\alpha$ radiation could give yields of hot electrons and their transport scalelengths as a function of preplasma.

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Authors

  • T. Ma

    University of California San Diego, UCSD, LLNL

  • M.H. Key

    LLNL, Lawrence Livermore National Laboratory

  • D. Hey

    LLNL

  • S. LePape

    LLNL

  • A.J. Mackinnon

    LLNL, Lawrence Livermore National Laboratory

  • A.G. MacPhee

    LLNL

  • P.K. Patel

    LLNL, Lawrence Livermore National Laboratory

  • K.U. Akli

    General Atomics, GA

  • R.B. Stephens

    General Atomics, GA, General Atomics, San Diego

  • T. Bartal

    UCSD

  • S. Chawla

    UCSD

  • D. Higginson

    UCSD

  • J.A. King

    UCSD

  • Mingsheng Wei

    University of California, San Diego, UCSD

  • B. Westover

    University of California San Diego, UCSD

  • T. Yabuuchi

    UCSD, UCSD, USA, University of California, San Diego

  • F.N. Beg

    University of California, San Diego, University of California San Diego, UC San Diego, UCSD, Department of Mechanical and Aerospace Engineering, University of California San Diego

  • C.D. Chen

    MIT

  • R.R. Freeman

    The Ohio State University, The Ohio State University, Columbus, OH, OSU

  • E. Kemp

    OSU

  • V. Ovchinnikov

    OSU

  • L. Van Woerkom

    Physics Department, The Ohio State University, Columbus Oh 43210, The Ohio State University, Columbus, OH, OSU

  • C. Stoeckl

    Laboratory for Laser Energetics, U of Rochester

  • W. Theobald

    U of Rochester

  • Y.Y. Tsui

    Electrical and Computer Engineering, University of Alberta, Edmonton Canada, Dept. of Elec. and Computer Engr., Univ. of Alberta, Univ of Alberta, U of Alberta