研究目的
Investigating the de?ection of laser pulses and accelerated electrons in a laser-plasma accelerator (LPA) by the effects of laser pulse front tilt and transverse density gradients.
研究成果
The study proposes a physical interpretation and quantitative model for laser steering and electron beam de?ection in asymmetric laser wakefield acceleration, caused by pulse front tilt and/or a transverse density gradient. The models show good agreement with particle-in-cell simulations and experiments. PFT can routinely result in a 0.1–1 mrad de?ection of the electron beam, which can be used to controllably de?ect an electron beam at the end of an LPA stage without strongly affecting the electron beam parameters.
研究不足
The study assumes the laser was Gaussian in time and space and that the laser propagation was not affected by the plasma, which may not hold for all experimental conditions. The electron steering is too sensitive for predictive simulation and theoretical results due to experimental uncertainties.
1：Experimental Design and Method Selection:
The study involves quantitative models for laser and electron steering, validated by particle-in-cell simulations and experiments with the BELLA Petawatt Laser.
2：Sample Selection and Data Sources:
Experiments were performed with the BELLA petawatt laser and a supersonic helium gas jet target.
3：List of Experimental Equipment and Materials:
BELLA Petawatt Laser, supersonic helium gas jet target, GRENOUILLE for angular dispersion measurement.
4：Experimental Procedures and Operational Workflow:
The final optical compressor was adjusted to add near-field angular dispersion and group delay dispersion to the laser, producing PFT at focus. Laser and electron beam de?ection resulting from added PFT was recorded as a function of ?(2) for several values of β.
5：Data Analysis Methods:
Laser de?ection was measured by imaging the near-field laser mode on the first optic after the plasma target. Electron pointing direction was determined from the insertable phosphor screen, yielding the angular distribution of charge density.
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