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Hohlraum-driven high-convergence implosion experiments with multiple beam cones on the omega laser facility.
Peter Amendt1, R E Turner, O L Landen
1Lawrence Livermore National Laboratory, California 94550, USA.
Physical Review Letters
|October 26, 2002
Summary
High-convergence implosion experiments achieved near-predicted neutron production. Improved hohlraum symmetry enabled deuterium fuel convergence ratios exceeding 20 in single-shell implosions.
Area of Science:
- * Physics
- * Nuclear Fusion
- * High-Energy-Density Physics
Background:
- * Inertial confinement fusion (ICF) research aims to achieve controlled nuclear fusion.
- * Achieving high fuel convergence is critical for ignition in ICF.
- * Hohlraum radiation symmetry is a key factor influencing implosion performance.
Purpose of the Study:
- * To perform high-convergence implosion experiments on the Omega laser facility.
- * To investigate the impact of improved hohlraum radiation symmetry on implosion performance.
- * To demonstrate neutron production from single-shell implosions with high deuterium fuel convergence.
Main Methods:
- * Experiments conducted on the Omega laser facility using cylindrical gold hohlraums.
- * Utilized 40 drive beams arranged in multiple cones.
- * Employed improved hohlraum radiation symmetry conditions.
Main Results:
- * Achieved near predicted primary (2.45 MeV) neutron production.
- * Demonstrated deuterium fuel convergence ratios exceeding 20.
- * Experiments were performed at an ignition-relevant hohlraum case-to-capsule ratio of approximately 3.
Conclusions:
- * Improved hohlraum radiation symmetry is effective in achieving high-convergence implosions.
- * High convergence ratios can lead to significant neutron production in ICF experiments.
- * These results contribute to the understanding of ignition pathways in ICF.