Bremsstrahlung Measurements of the Properties of Laser-Generated Hot Electrons for Fast Ignition

ORAL

Abstract

The laser to hot electron coupling efficiency, divergence angle, and spectrum are the key parameters for evaluating whether a compressed fusion capsule will ignite under the Fast Ignition scheme for Inertial Confinement Fusion. These properties were studied on the Titan laser (1054 nm, 150 J, 0.7 ps, 10$^{20}$ W/cm$^2$) at LLNL using an array of absolutely calibrated Bremsstrahlung spectrometers (differential sensitivity up to 700 keV) measuring emission from planar multilayer foil and cone-foil targets. A HOPG crystal spectrometer was also used to measure the line emission from buried flours. The electron transport and x-ray emission is modeled with the Monte Carlo code ITS 3.0 and the hybrid-PIC code LSP LLNL-ABS-45809

*This work performed under the auspices of the U.S. Dept. of Energy by LLNL under Contract DE-AC52-07NA27344. LLNL-ABS-442834

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Authors

  • Y. Ping

    • LLNL

  • H. Sawada

    • UCSD

  • Cliff Chen

    • LLNL

  • B. Westover

    • UCSD

  • F.N. Beg

    • UCSD

  • J.R. Davies

    • Instituto Superior Technico

  • R. Fedosjevs

    • University of Alberta

  • R.R. Freeman

    • OSU

  • H. Friesen

    • University of Alberta

  • M.H. Key

    • LLNL

  • K. Li

    • Instituto Superior Technico

  • A. Link

    • OSU

  • H. McLean

    • LLNL

  • A. Morace

    • University of Milan

  • V. Ovchinnikov

    • OSU

  • P.K. Patel

    • LLNL

  • A. Sorokovikova

    • UCSD

  • R. Stephens

    • General Atomis

  • M. Streeter

    • Imperial College London

  • L. Van Woerkom

    • OSU

  • D. Wertepny

    • OSU

  • S.C. Wilks

    • LLNL