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Enhanced direct-drive implosions with thin high-Z ablation layers.

Andrew N Mostovych1, Denis G Colombant, Max Karasik

  • 1Enterprise Sciences, Inc., Silver Spring, Maryland 20905, USA.

Physical Review Letters
|March 21, 2008
PubMed
Summary

Adding a thin palladium coating to deuterium-filled shells significantly improved neutron yield in direct-drive spherical implosion experiments. This finding suggests a new method for enhancing stability in laser-driven fusion energy targets.

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Area of Science:

  • Physics
  • Nuclear Fusion
  • Materials Science

Background:

  • Direct-drive spherical implosion is a key approach for inertial confinement fusion.
  • Achieving high neutron yields is crucial for demonstrating fusion energy viability.
  • Shell stability is a primary challenge in laser-driven fusion targets.

Purpose of the Study:

  • To investigate the effect of high-Z material coatings on neutron yield in direct-drive spherical implosions.
  • To explore methods for improving the stability of imploding fusion targets.
  • To assess the potential of thin high-Z coatings for laser fusion energy applications.

Main Methods:

  • Experiments using deuterium-filled plastic shells in direct-drive spherical implosion.
  • Coating shells with a thin layer (200-400 A) of high-Z material, specifically palladium.
  • Measuring neutron yield as a primary performance metric.

Main Results:

  • A significant, absolute (2x) improvement in neutron yield was observed with palladium-coated shells.
  • The enhanced neutron yield is attributed to increased stability of the imploding shell.
  • Thin high-Z coatings demonstrably impact implosion performance.

Conclusions:

  • Thin high-Z material coatings, such as palladium, can substantially enhance neutron yield in fusion implosions.
  • This approach offers a promising pathway to control laser imprint and improve shell stability.
  • The findings present a viable strategy for advancing laser-driven fusion energy target designs.