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Anomalous resistivity resulting from MeV-electron transport in overdense plasma
1Institute of Laser Engineering, Osaka University, Suita, Osaka, Japan. sentoku@fusion.gat.com
Physical Review Letters
|May 7, 2003
Summary
Hot electron transport in plasma generates instabilities and anomalous resistivity. This leads to rapid stopping of MeV electrons, significantly faster than classical effects.
Area of Science:
- Plasma Physics
- Laser-Plasma Interactions
- Computational Physics
Background:
- Laser-produced hot electrons are crucial in inertial confinement fusion and high-energy-density physics.
- Understanding hot electron transport is key to controlling energy deposition and plasma dynamics.
Purpose of the Study:
- Investigate hot electron transport in overdense plasmas.
- Analyze the instabilities and resistivity generated by return currents.
- Quantify the anomalous stopping of fast electrons.
Main Methods:
- Three-dimensional particle-in-cell (PIC) simulations.
- Modeling of hot electron currents and cold plasma electron response.
- Analysis of electromagnetic and electrostatic instabilities.
Main Results:
- Hot electron currents induce Weibel and tearing instabilities in cold plasma electrons.
- Current filaments coalesce into a single global channel.
- Anomalous resistivity significantly enhances electron stopping power.
Conclusions:
- Plasma instabilities driven by hot electron currents lead to anomalous resistivity.
- This anomalous resistivity causes rapid deceleration of MeV electrons, far exceeding classical predictions.
- The findings have implications for laser-driven fusion and particle acceleration in plasmas.