Optimized laser-assisted electron injection into a quasilinear plasma wakefield.

Area of Science:

• Plasma Physics
• Particle Acceleration
• Laser-Plasma Interactions

Background:

• Plasma wakefield acceleration (PWFA) offers a promising avenue for next-generation particle accelerators.
• Efficient electron injection into plasma wakes remains a critical challenge for PWFA.

Purpose of the Study:

• To present and investigate a new electron injection scheme for PWFA.
• To optimize electron trapping and acceleration parameters for potential applications like the AWAKE experiment.

Main Methods:

• Utilizing fast electron generation via femtosecond laser pulse interaction with a dense plasma target.
• Studying the trapping of these laser-expelled electrons by a quasilinear wakefield driven by an external beam.
• Employing 3D particle-in-cell simulations to verify theoretical trapping conditions and optimize parameters.

Main Results:

• Demonstrated trapping of electron bunches with ~100 pC charge and ~60μm emittance.
• Achieved acceleration to GeV energies with an energy spread of ~1% over 10 meters.
• Identified an approximate trapping condition for linear axisymmetric wakes, aiding in optimization.

Conclusions:

• The proposed laser-driven electron injection scheme is effective for PWFA.
• This method shows potential for generating high-quality electron beams for future accelerator designs.
• The findings are directly relevant to ongoing research in advanced particle acceleration experiments.