Nanoscale Electron Bunching in Laser-Triggered Ionization Injection in Plasma Accelerators

Area of Science:

• Plasma physics
• Particle acceleration

Background:

• Ionization injection is a promising method for controlled electron beam generation in plasma wakefield acceleration.
• Understanding electron trapping dynamics is crucial for producing high-quality beams.

Purpose of the Study:

• To theoretically analyze and computationally examine the electron injection and trapping process in plasma wakefield acceleration.
• To investigate the impact of three-dimensional effects on electron beam phase space structure.

Main Methods:

• Theoretical analysis of phase-dependent tunneling ionization and nonlinear wake trapping.
• Three-dimensional particle-in-cell simulations to model the injection dynamics.

Main Results:

• Nonlinear mapping of discrete electron injection to discrete final phase space structure.
• Three-dimensional effects limit the modulation wave number to between >2k₀ and approximately 5k₀.
• Demonstration of nanoscale bunched beams suitable for coherent transition radiation generation.

Conclusions:

• Ionization injection offers a controllable route to high-quality electron beams.
• The generated nanoscale beams have potential applications in high-power ultraviolet radiation generation.