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Plasma density limits for hole boring by intense laser pulses
Natsumi Iwata1, Sadaoki Kojima2,3, Yasuhiko Sentoku2
1Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan. iwata-n@ile.osaka-u.ac.jp.
Nature Communications
|February 14, 2018
Summary
High-power lasers create radiation pressure, enabling laser hole boring (HB) in plasma. This study derives the limit density for HB and confirms theories with simulations, crucial for laser-driven applications.
Area of Science:
- Plasma physics
- High-intensity laser-matter interactions
Background:
- Relativistic high-power lasers with multi-picosecond pulses are common.
- Laser intensities generate giga-bar radiation pressures, driving plasma dynamics.
Purpose of the Study:
- To derive the limit density for laser hole boring (HB) as a function of laser intensity.
- To determine the timescale for reaching the limit density.
- To investigate the relationship between laser pulse length and superthermal electron energy.
Main Methods:
- Theoretical derivation of limit density and timescale for HB.
- Validation through particle-in-cell (PIC) simulations.
Main Results:
- The maximum plasma density reachable by HB is determined by laser intensity.
- The time scale for reaching this density is derived.
- Plasma blowout and superthermal electron generation occur after reaching the limit density.
Conclusions:
- The derived theories accurately predict HB dynamics.
- Laser pulse length influences superthermal electron energy, offering a control parameter for applications.
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