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Updated: Jun 25, 2026
07:17
Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Bulk heating of solid-density plasmas during high-intensity-laser plasma interactions.
P M Nilson1, W Theobald, J F Myatt
1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
Summary
High-intensity laser pulses efficiently heat copper foil targets to over 200eV. This bulk heating is achieved through collisional energy transfer from fast electrons, validated by K-shell X-ray spectroscopy.
Area of Science:
- Plasma Physics
- Laser-Plasma Interactions
- Materials Science
Background:
- Understanding energy deposition mechanisms in laser-irradiated materials is crucial for applications in inertial confinement fusion and materials processing.
- Previous studies have focused on surface heating, but bulk heating dynamics in small-scale targets remain less explored.
Purpose of the Study:
- To investigate the interaction of high-intensity laser pulses with small-mass copper foil targets.
- To demonstrate and quantify efficient bulk heating of the target material.
- To validate experimental findings with numerical simulations.
Main Methods:
- Utilizing K-shell X-ray spectroscopy to probe the target's electronic structure and temperature.
- Employing high-intensity laser pulses (>10^19 W/cm^2) on precisely fabricated copper foil targets (>20x20x2 micrometers).
- Conducting three-dimensional numerical target-heating simulations to model energy transfer processes.
Main Results:
- Demonstrated efficient bulk heating of copper foil targets to temperatures exceeding 200 eV.
- Observed collisional energy transfer from recirculating fast electrons as the primary heating mechanism.
- Achieved good agreement between experimental K-photon yields and simulated bulk-electron temperatures.
Conclusions:
- High-intensity laser-matter interactions can induce significant bulk heating in small-mass targets.
- Fast electron dynamics and collisional energy transfer play a critical role in efficient energy deposition.
- Numerical simulations provide a reliable tool for understanding and predicting laser-driven target heating phenomena.
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