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First Indirect Drive Experiment Using a Six-Cylinder-Port Hohlraum.

Xin Li1, Yunsong Dong2, Dongguo Kang1

  • 1Institute of Applied Physics and Computational Mathematics, Beijing 100088, China.

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A new experimental platform and simulation model enable indirect drive experiments using a six-cylinder-port hohlraum. This study achieves high x-ray conversion efficiency and low backscatter, crucial for inertial confinement fusion research.

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Area of Science:

  • * Inertial Confinement Fusion (ICF)
  • * High-Energy-Density Physics

Background:

  • * Traditional ICF research often utilizes cylindrical or spherical hohlraums.
  • * Laser facilities designed for specific hohlraum geometries may have limitations for other configurations.

Purpose of the Study:

  • * To introduce and validate a new experimental platform and quasi-3D simulation model for indirect drive experiments.
  • * To investigate the performance of a six-cylinder-port hohlraum at a laser facility primarily designed for cylindrical hohlraums.
  • * To assess the feasibility of using this configuration for ignition-scale ICF studies.

Main Methods:

  • * Development of a novel hohlraum experimental platform and a quasi-3D simulation model.
  • * Conducting implosion experiments using a six-laser-entrance-hole hohlraum at the 100 kJ Laser Facility.
  • * Utilizing a 2 ns square laser pulse with approximately 80 kJ energy.

Main Results:

  • * Achieved a peak hohlraum radiation temperature of ~222 eV.
  • * Inferred a high x-ray conversion efficiency of ~87%, comparable to cylindrical hohlraums.
  • * Demonstrated low laser backscatter, similar to the outer cone of a cylindrical hohlraum.
  • * Quasi-3D simulations accurately reproduced radiation temperature, M-band flux, and yield-over-clean variations.

Conclusions:

  • * The developed platform and model successfully enable indirect drive studies with a six-cylinder-port hohlraum.
  • * This configuration effectively utilizes all laser beams from the facility, demonstrating its potential for ICF research.
  • * The findings are crucial for numerically assessing laser energy requirements for ignition-scale hohlraums.