Acceleration of a rest electron bunch in vacuum by a Laguerre–Gauss (LG) laser pulse is studied using three-dimensional test-particle simulations. It is found that the ponderomotive force and the phase synchronization process, with the help of each other, cause rest electrons to reach high energies in the laser interaction. The ponderomotive force due to the spatial distribution of a high-intensity LG laser pulse pushes electrons from the rest and accelerates them at first. Then, the accelerated electrons are trapped in the pulse and continue to gain more energy through the phase synchronization process. Unlike the interaction with a Gaussian laser pulse in which to maintain the beam quality was not possible without the intervention of an external factor, using the LG laser pulse reveals the feasibility of generating a GeV high-quality electron bunch with low spread in energy and radial deflection, without applying any external agent.

中文翻译：

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拉盖尔-高斯激光脉冲直接电子束加速

使用三维测试粒子模拟研究了拉盖尔-高斯 (LG) 激光脉冲在真空中对静止电子束的加速。发现有质动力和相位同步过程在相互帮助下使静止电子在激光相互作用中达到高能量。由于高强度 LG 激光脉冲的空间分布而产生的有质动力首先推动电子从其余部分加速。然后，加速的电子被困在脉冲中，并通过相位同步过程继续获得更多能量。与高斯激光脉冲的相互作用不同，如果没有外部因素的干预，就不可能保持光束质量，