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Effects of Laser Bandwidth in Direct-Drive High-Performance DT-Layered Implosions on the OMEGA Laser
D Patel1,2, J P Knauer1, D Cao1
1Laboratory for Laser Energetics, University of Rochester, New York 14623, USA.
Physical Review Letters
|September 22, 2023
Summary
Increasing laser bandwidth significantly improves direct-drive inertial confinement fusion performance, especially for less stable targets. Higher bandwidth lasers are crucial for achieving high convergence and fusion gains.
Area of Science:
- Physics
- Plasma Physics
- Fusion Energy
Background:
- Laser bandwidth is a critical factor in mitigating hydrodynamic instabilities in inertial confinement fusion (ICF).
- Laser imprinting seeds instabilities that degrade ICF implosion performance.
Purpose of the Study:
- To investigate the effect of varying laser bandwidth on direct-drive DT-layered implosions.
- To assess how hydrodynamic stability, controlled by shell adiabat, influences bandwidth impact.
Main Methods:
- Experiments were conducted on targets with differing hydrodynamic stability properties.
- Shell adiabat was varied from approximately 5 (more stable) to 3.5 (less stable) to control stability.
Main Results:
- Implosion performance improved significantly with increased laser bandwidth, particularly for lower adiabat (less stable) targets.
- Current OMEGA laser bandwidth limitations were reached, suggesting further increases would be beneficial.
Conclusions:
- Higher laser bandwidth offers substantial benefits for direct-drive ICF, especially for less stable configurations.
- Future ultra-broadband lasers could unlock high convergence ratios and high energy gains in direct-drive ICF.
