Controlled injection and acceleration of electrons in plasma wakefields by colliding laser pulses

Area of Science:

• Physics
• Accelerator Science
• Plasma Physics

Background:

• Laser-plasma accelerators offer high energy gain over short distances.
• Current methods for electron injection are unstable and irreproducible.
• Achieving stable, high-quality electron beams is crucial for applications.

Purpose of the Study:

• To demonstrate controlled electron injection and acceleration using a dual-laser pulse system.
• To improve the stability and reproducibility of electron beams from laser-plasma accelerators.

Main Methods:

• Utilizing a second laser pulse to interact with the primary laser-driven plasma wakefield.
• Employing the collision of two laser pulses to pre-accelerate electrons for controlled injection.
• Characterizing the resulting electron beams for energy, divergence, stability, and duration.

Main Results:

• Achieved stable and reproducible electron beams with low divergence (<5 mrad).
• Produced monoenergetic electron beams with energy spread <10% and tunable between 15-250 MeV.
• Observed electron bunch durations shorter than 10 femtoseconds.

Conclusions:

• Dual-laser pulse injection offers a stable and controllable method for generating high-quality electron beams.
• This technique overcomes previous limitations in laser-plasma accelerator reproducibility.
• The developed electron source is suitable for applications in materials science, radiotherapy, and femtochemistry.