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Published on: May 9, 2021
Electron bow-wave injection of electrons in laser-driven bubble acceleration
1College of Science, National University of Defense Technology, Changsha 410073, China. plasim@163.com
Summary
Electron bow-wave injection significantly enhances electron trapping in laser wake-field acceleration. This novel injection regime, observed in simulations, boosts trapped electron numbers by two orders of magnitude with increased laser intensity.
Area of Science:
- Plasma Physics
- Particle Acceleration
Background:
- Laser wake-field acceleration (LWFA) is a promising method for generating high-energy electron beams.
- Electron injection is a critical process determining the quality and quantity of accelerated electrons in LWFA.
Purpose of the Study:
- To investigate the electron bow-wave injection regime in laser wake-field acceleration.
- To understand the mechanism of electron trapping and enhancement in this regime.
Main Methods:
- Two- and three-dimensional particle-in-cell (PIC) simulations.
- Development of an analytical model to explain simulation results.
Main Results:
- Identified electron bow-wave injection as a distinct electron trapping mechanism.
- Observed a two-order-of-magnitude enhancement in trapped electron number with increasing laser intensity (from 2 × 10^19 to 1 × 10^20 W/cm^2).
- Demonstrated the transition from self-injection to bow-wave injection.
Conclusions:
- Electron bow-wave injection provides a pathway for significantly increasing the number of trapped electrons in LWFA.
- The proposed analytical model successfully explains the observed phenomenon.
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