Energetic electron-bunch generation in a phase-locked longitudinal laser electric field.

Area of Science:

• Plasma Physics
• Laser-Plasma Interactions
• High-Energy Particle Acceleration

Background:

• Investigating energetic electron acceleration is crucial for understanding laser-plasma interactions.
• Plasma hollow tubes offer unique environments for laser propagation and particle acceleration.

Purpose of the Study:

• To investigate energetic electron acceleration in a plasma hollow tube irradiated by ultraintense laser pulses.
• To elucidate the role of the longitudinal laser field component in electron trapping and acceleration.

Main Methods:

• Utilizing particle-in-cell (PIC) simulations to model laser-plasma interactions.
• Employing single particle modeling to analyze electron dynamics within the laser field.

Main Results:

• A linear polarized Gaussian laser pulse significantly enhances its longitudinal electric field component within the plasma tube.
• This longitudinal field, with a specific phase shift and interval, effectively traps plasma electrons.
• Trapped electrons are further accelerated to higher energies by the longitudinal electric field.

Conclusions:

• The enhanced longitudinal laser field component is key to the observed energetic electron acceleration.
• This mechanism provides a new pathway for efficient electron acceleration in laser-driven plasma systems.