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Nanoparticle-insertion scheme to decouple electron injection from laser evolution in laser wakefield acceleration.
Jiancai Xu1, Leejin Bae2, Mohamed Ezzat2,3
1State Key Laboratory of High Field Laser Physics, CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences(CAS), Shanghai, 201800, China.
Scientific Reports
|July 1, 2022
Summary
A new nanoparticle insertion method precisely controls electron injection in laser wakefield acceleration. This stable, high-charge electron source is ideal for multi-GeV electron generation in low-density plasmas.
Area of Science:
- Plasma Physics
- Particle Acceleration
- Laser-Plasma Interactions
Background:
- Laser wakefield acceleration (LWFA) is a promising technique for generating high-energy electron beams.
- Controlling electron injection is crucial for stable and reproducible LWFA.
- Current injection methods can disrupt laser propagation, limiting performance.
Purpose of the Study:
- To develop a localized nanoparticle insertion scheme for controlled electron injection.
- To decouple electron injection from laser evolution in LWFA.
- To establish a stable, high-charge electron injector for multi-GeV sources.
Main Methods:
- Nanoparticles generated via laser ablation of a copper target.
- Localized insertion of nanoparticles into the plasma medium.
- Optimization of ablation laser energy and pulse delay.
Main Results:
- Achieved localized electron injection within a 100 μm range.
- Produced electron bunches with >300 pC charge and ~12 mrad divergence.
- Demonstrated >90% injection probability after optimization.
Conclusions:
- The nanoparticle insertion method enables controllable and localized electron injection.
- This technique avoids disturbing laser evolution, ensuring stable injection.
- It provides a robust electron injector for multi-GeV electron sources from low-density plasmas.
