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Magnetic Signatures of Radiation-Driven Double Ablation Fronts
P T Campbell1, C A Walsh2, B K Russell1
1Gérard Mourou Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA.
Physical Review Letters
|October 16, 2020
Summary
Experiments on the OMEGA EP laser system revealed magnetic field generation in double ablation fronts. Proton radiography and simulations explored these fields across various target materials, detailing their strength and dynamics.
Area of Science:
- Plasma Physics
- High-Energy-Density Physics
Background:
- Laser-plasma interactions can generate significant magnetic fields.
- Understanding these fields is crucial for inertial confinement fusion and astrophysical phenomena.
Purpose of the Study:
- To investigate magnetic field generation in double ablation fronts.
- To characterize the strength, spatial profile, and temporal dynamics of self-generated magnetic fields.
- To explore the influence of target material on magnetic field generation.
Main Methods:
- Experiments using the OMEGA EP laser system.
- Proton radiography for magnetic field measurement.
- Varying target materials (plastic, aluminum, copper, gold).
- Extended magnetohydrodynamic simulations with radiation transport.
Main Results:
- Observed magnetic field generation in double ablation fronts.
- Identified two distinct magnetic field regions in mid-Z targets: one from electron thermal transport gradients and another from radiation-driven gradients.
- Simulations reproduced key experimental observations, including field generation and double ablation front formation.
Conclusions:
- Magnetic fields in double ablation fronts are complex, influenced by both thermal and radiation transport.
- The OMEGA EP laser system is a valuable tool for studying these phenomena.
- Magnetohydrodynamic simulations provide a good framework for understanding laser-generated magnetic fields.
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