研究目的
To describe the plasma dynamics when a homogeneous low dense plasma is irradiated by relativistic linearly polarized LG beams, focusing on the transfer of orbital angular momentum (OAM) from the laser beam to electrons and the associated electron OAM distribution.
研究成果
The study demonstrates that relativistic Laguerre-Gauss beams can transfer part of their orbital angular momentum to plasma electrons through a dephasing process similar to the direct laser acceleration mechanism. This transfer is more efficient for radial polarization and leads to the generation of a quasistatic magnetic field. The findings provide insights into the electron dynamics and the potential for controlling OAM in plasma applications.
研究不足
The perturbative theory is limited to the low intensity regime and does not fully explain the laser to plasma OAM transfer observed at high laser intensity. The study also does not consider the influence of the self-consistent fields generated by the plasma in the initial analysis.
1：Experimental Design and Method Selection:
The study uses 3D particle-in-cell (PIC) simulations to model the interaction of a low dense plasma with relativistic Laguerre-Gauss beams. The perturbative analysis is applied to the motion equations for electrons to identify the accelerating processes.
2：Sample Selection and Data Sources:
The plasma is composed of electrons and protons with an initial density equal to 1% of the plasma critical density. The laser pulse is characterized with an OAM l = 1 and an intensity of 2 × 10^18 W/cm^
3：List of Experimental Equipment and Materials:
The 3D PIC code OCEAN is used for simulations. The laser pulse is injected into the numerical box with a spatial resolution of λ0/
4：Experimental Procedures and Operational Workflow:
The laser-plasma interaction is studied from ω0t = 0 to ω0t = 135. The electron dynamics are analyzed with and without considering the plasma-induced self-consistent fields.
5：The electron dynamics are analyzed with and without considering the plasma-induced self-consistent fields.
Data Analysis Methods:
5. Data Analysis Methods: The electron OAM values are computed and analyzed to understand the transfer mechanism and the generation of a quasistatic magnetic field.
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