Dynamics and Power Balance of Near Unity Target Gain Inertial Confinement Fusion Implosions.

Area of Science:

• Plasma Physics
• Nuclear Fusion
• Inertial Confinement Fusion

Background:

• Understanding the dynamics of fusion plasmas is crucial for achieving controlled nuclear fusion.
• Quantifying plasma properties at increasing target gains is essential for optimizing fusion energy production.

Purpose of the Study:

• To analyze the power balance and temporal dynamics of inertially confined fusion plasmas.
• To investigate the evolution of plasma parameters like size, temperature, mass, and areal density with increasing target gain.

Main Methods:

• Experimental quantification of plasma properties at target gains up to 0.72.
• Comparison of experimental observations with analytic models of plasma behavior.

Main Results:

• Increased self-heating rates initially overcome expansion power losses as target gain rises.
• Reacting plasmas exhibit later peak fusion production, increased size, temperature, and mass, with lower emission weighted areal densities.
• Expansion power loss approaches a constant ratio to self-heating power at peak fusion production.

Conclusions:

• Analytic models support the observed evolution of plasma quantities with increasing fusion self-heating and target gain.
• Expansion power losses are a dominant factor in the dynamics of fusion plasmas at peak production.
• Findings provide insights into optimizing inertial confinement fusion performance.