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Proton radiography of a laser-driven implosion.

A J Mackinnon1, P K Patel, M Borghesi

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Physical Review Letters
|August 16, 2006
PubMed
Summary

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Picosecond laser-accelerated protons radiographed an imploded capsule, revealing core density gradients and asymmetries. Higher energy protons are needed for ignition-scale conditions.

Area of Science:

  • * Nuclear Fusion Science
  • * Laser-Plasma Physics
  • * High-Energy-Density Physics

Background:

  • * Inertial confinement fusion (ICF) research aims to achieve controlled nuclear fusion.
  • * Diagnosing the implosion dynamics and core conditions is critical for ICF success.
  • * Laser-driven proton acceleration offers a potential diagnostic tool.

Purpose of the Study:

  • * To utilize laser-accelerated protons for radiography of an imploded capsule.
  • * To characterize density gradients and asymmetries during ICF implosions.
  • * To assess the feasibility of proton backlighting for ICF diagnostics.

Main Methods:

  • * A 500 microm diameter capsule was imploded using 6 laser beams (1.054 microm wavelength, 1 ns pulse duration, 300 J total energy).

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  • * Point projection proton backlighting, driven by picosecond laser pulses, was employed.
  • * Data were compared with analytic scattering theory and Monte Carlo simulations.

    • Main Results:

    • * Density gradients and asymmetries were diagnosed at discrete times during the implosion.
    • * A core with a density of 3+/-1 g/cm3 and a diameter of 85+/-10 microm was inferred.
    • * Asymmetries were observed in both early and stagnation phases.

    Conclusions:

    • * Proton backlighting is a viable technique for diagnosing ICF implosions.
    • * The study successfully characterized the implosion core and asymmetries.
    • * Protons exceeding 50 MeV are necessary for diagnosing asymmetry in ignition-scale ICF conditions.