研究目的
Investigating the role of laser polarization in electron self-trapping in laser wakefield acceleration (LWFA) with experiments and numerical simulations.
研究成果
The study reveals that laser polarization significantly affects the self-injection threshold and electron beam charge in LWFA, with circular polarization enabling lower injection thresholds and higher beam charges compared to linear polarization. This is attributed to the larger momentum gain by electrons during above threshold ionization with circular polarization.
研究不足
The study is limited to helium as the target medium, and the effects of laser polarization on self-injection may vary with other gases or under different experimental conditions.
1：Experimental Design and Method Selection:
The experiment was performed at the HERCULES laser facility, using laser pulses with either circular or linear polarization to study their effects on self-injection in LWFA.
2：Sample Selection and Data Sources:
A 3D-printed gas cell filled with pure helium was used as the target. Plasma density was characterized using a Mach-Zehnder interferometer.
3：List of Experimental Equipment and Materials:
The setup included a dipole magnet for electron energy spectra measurement, a Lanex screen, a Fuji BAS-MS image plate for charge calibration, and a flat-field XUV spectrometer for plasma emission analysis.
4：Experimental Procedures and Operational Workflow:
Laser pulses were focused onto the helium gas cell, and the resulting electron beams and plasma emissions were analyzed.
5：Data Analysis Methods:
Electron beam charge and spectra were analyzed to compare the effects of laser polarization on self-injection.
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