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Analytic models of high-temperature hohlraums.

W A Stygar1, R E Olson, R B Spielman

  • 1Sandia National Laboratories, MS 1194, Albuquerque, New Mexico 87185-1194, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2001
PubMed
Summary

A new unified model for high-temperature hohlraums improves predictions for laser-driven inertial confinement fusion. This model enhances understanding of energy conversion and capsule coupling efficiency in experiments.

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Area of Science:

  • Plasma Physics
  • High-Energy-Density Physics
  • Fusion Energy Research

Background:

  • Hohlraums are critical components in inertial confinement fusion (ICF) experiments, enabling energy transfer from lasers to targets.
  • Accurate modeling of hohlraum physics is essential for optimizing ICF performance and achieving ignition.

Purpose of the Study:

  • To develop a unified set of high-temperature hohlraum models for improved theoretical and experimental analysis.
  • To provide a framework for defining and measuring key parameters like conversion efficiency and capsule coupling.

Main Methods:

  • Development of a new analytical model for hohlraum energetics, incorporating source power, cavity geometry, and material properties.
  • Formulation of equations for radiation brightness temperature, wall albedo, and conversion efficiency in terms of measurable quantities.

Related Experiment Videos

  • Application of the model to steady-state hohlraums enclosing capsules and z pinches.

    • Main Results:

    • The model accurately relates measurable experimental parameters to hohlraum performance metrics.
    • For capsule-containing hohlraums, the model predicts 15-23% higher capsule-coupling efficiency compared to prior analytic expressions.
    • The model provides insights into the characteristic time for temperature changes within the hohlraum.

    Conclusions:

    • The unified hohlraum model offers a more accurate and comprehensive approach to analyzing ICF hohlraum performance.
    • This improved modeling is expected to enhance the design and interpretation of ICF experiments, including those at the National Ignition Facility.
    • The model's applicability to different hohlraum configurations, such as those with z pinches, highlights its versatility.