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Low Fuel Convergence Path to Direct-Drive Fusion Ignition.

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This study introduces novel multishell inertial fusion capsules designed for robust ignition using low-intensity laser direct drive. These capsules mitigate instabilities, achieving high hydrodynamic efficiency for controlled fusion energy.

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Area of Science:

  • Nuclear Fusion Energy
  • Plasma Physics
  • Inertial Confinement Fusion

Background:

  • Inertial confinement fusion (ICF) research aims to achieve controlled thermonuclear fusion for energy production.
  • Achieving robust ignition in ICF requires overcoming challenges like hydrodynamic instabilities and laser-plasma interactions.
  • Traditional ICF approaches often face limitations in efficiency and stability at relevant energy scales.

Purpose of the Study:

  • To present a new class of inertial fusion capsules for robust ignition.
  • To explore the use of multishell targets with low-intensity laser direct drive.
  • To mitigate Rayleigh-Taylor instabilities and enhance hydrodynamic efficiency.

Main Methods:

  • Development of a novel capsule design featuring three concentric, heavy metal shells.
  • Utilizing laser direct drive at a low intensity of 2.8×10^14 W/cm².
  • Enclosing liquid deuterium-tritium fuel within the target volume.

Main Results:

  • Ignition is designed to occur 'upstream' from stagnation, minimizing pusher deceleration.
  • The low laser intensity avoids thresholds for laser plasma instability and cross-beam energy transfer.
  • Achieved high hydrodynamic efficiency of approximately 10%.

Conclusions:

  • The proposed multishell capsule design offers a robust pathway to ignition in ICF.
  • Low-intensity direct drive with advanced target design can overcome key instability challenges.
  • This approach demonstrates potential for efficient and stable inertial fusion energy development.