We present, using three-dimensional particle-in-cell simulations, an observation that orbital angular momentum (OAM) is transferred to resonant electrons proportionally to longitudinal momentum when Laguerre-Gaussian plasma waves are subjected to Landau damping. A higher azimuthal mode number leads to a larger net orbital angular momentum transfer to particles traveling close to the phase velocity of the plasma wave, implying a population of electrons that are orbiting the same center of rotation as the plasma wave. This observation has implications on magnetic field excitation as a result of the formation and damping of OAM plasma waves. The energy distributions of electrons in damping Laguerre-Gaussian plasma waves are significantly changed as a function of azimuthal mode number. This leads to larger numbers of lower energy particles tending towards a significant narrowing of the energy distribution of accelerated particles.

中文翻译：

---

具有轨道角动量的等离子波的非线性Landau阻尼

我们目前使用三维粒子模拟，观察到当Laguerre-Gaussian等离子体波受到Landau阻尼时，轨道角动量（OAM）与纵向动量成比例地转移到共振电子上。较高的方位模数导致较大的净轨道角动量转移到接近等离子波相速度行进的粒子，这意味着在与等离子波相同的旋转中心处绕行的电子数量。由于OAM等离子体波的形成和衰减，该观察结果对磁场激发具有影响。阻尼拉盖尔-高斯等离子体波中电子的能量分布随方位模数的变化而显着变化。