Nuter R, Korneev Ph, Dmitriev E, Thiele I, Tikhonchuk V T
Université de Bordeaux, CNRS, CEA, UMR 5107, 33405 Talence, France.
National Research Nuclear University "MEPhI", Moscow 115409, Russian Federation.
Phys Rev E. 2020 May;101(5-1):053202. doi: 10.1103/PhysRevE.101.053202.
Three-dimensional "particle in cell" simulations show that a quasistatic magnetic field can be generated in a plasma irradiated by a linearly polarized Laguerre-Gauss beam with a nonzero orbital angular momentum (OAM). Perturbative analysis of the electron dynamics in the low intensity limit and detailed numerical analysis predict a laser to electrons OAM transfer. Plasma electrons gain angular velocity thanks to the dephasing process induced by the combined action of the ponderomotive force and the laser induced-radial oscillation. Similar to the "direct laser acceleration," where Gaussian laser beams transmit part of its axial momentum to electrons, Laguerre-Gaussian beams transfer a part of their orbital angular momentum to electrons through the dephasing process.
三维“粒子模拟”表明，在由具有非零轨道角动量（OAM）的线偏振拉盖尔 - 高斯光束辐照的等离子体中，可以产生准静态磁场。在低强度极限下对电子动力学的微扰分析以及详细的数值分析预测了激光到电子的轨道角动量转移。由于有质动力和激光诱导的径向振荡的联合作用所引起的相位失配过程，等离子体电子获得了角速度。类似于“直接激光加速”，即高斯激光束将其部分轴向动量传递给电子，拉盖尔 - 高斯光束通过相位失配过程将其部分轨道角动量传递给电子。
