Performance Scaling in Magnetized Liner Inertial Fusion Experiments

Area of Science:

• * Fusion Energy Science
• * Plasma Physics
• * High-Energy-Density Physics

Background:

• * Magnetized liner inertial fusion (MagLIF) is a promising concept for achieving controlled fusion.
• * Previous studies have not systematically investigated performance scaling with key drive parameters.
• * Understanding these scaling relationships is crucial for optimizing MagLIF performance.

Purpose of the Study:

• * To conduct the first systematic experimental study of performance scaling in MagLIF.
• * To investigate the impact of magnetic field, laser preheat, and drive current on fusion performance.
• * To identify performance limitations and guide future experimental designs.

Main Methods:

• * Performed MagLIF experiments with simultaneous and individual variations of drive parameters.
• * Measured burn-averaged ion temperature and deuterium-deuterium neutron yield.
• * Conducted parametric scans of initial magnetic field, laser preheat energy, and drive current.
• * Utilized simulations to capture experimental trends and predict future performance.

Main Results:

• * Achieved a >10x increase in neutron yield (to 1.1x10^13) and doubled ion temperature (to 3.1 keV).
• * Demonstrated the critical roles of magnetic insulation and the Nernst effect via parametric scans.
• * Identified implosion stability as a performance limiter at higher drive currents, necessitating increased fuel pressure.

Conclusions:

• * Simultaneous optimization of magnetic field, laser preheat, and current coupling significantly enhances MagLIF performance.
• * Experimental results align with simulations, indicating potential for further yield increases on the Z facility.
• * Future MagLIF designs must address implosion stability and fuel pressure to unlock higher fusion yields.