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Laser-driven electron acceleration in nanoplate array targets.

A R Knyazev¹, Y Zhang¹, S I Krasheninnikov¹

¹University of California San Diego, La Jolla, California 92093-0411, USA.

Physical Review. E

|February 19, 2021

Summary

High-intensity lasers interacting with nanoplates can accelerate electrons beyond standard limits. A model shows quasistatic electric fields are key to this enhanced electron acceleration, leading to stochastic motion.

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Area of Science:

Plasma Physics
Laser-Plasma Interactions
High-Intensity Laser Physics

Background:

Laser-driven electron acceleration is crucial for various applications.
Understanding acceleration mechanisms beyond ponderomotive scaling is essential.
Nanoplate targets offer unique interaction dynamics.

Purpose of the Study:

To propose a model for laser-driven electron acceleration with nanoplate targets.
To investigate the role of quasistatic fields in electron acceleration.
To identify parameters governing electron energy scaling.

Main Methods:

Development of a theoretical model for laser-nanoplate interaction.
Analysis of quasistatic electric (E_qs) and magnetic (B_qs) fields.
Two-dimensional particle-in-cell simulations using the EPOCH code.

Main Results:

Quasistatic electric and magnetic fields are generated by laser-extracted electrons.
The electric field (E_qs) amplitude is larger than the magnetic field (B_qs).
This field asymmetry drives electron acceleration beyond ponderomotive scaling via stochastic motion.

Conclusions:

The model explains electron acceleration exceeding ponderomotive limits.
A single universal parameter, dependent on laser and target properties, governs maximum electron energy.
Simulation results validate the analytical findings.