Nonlinear Landau damping of plasma waves with orbital angular momentum
Nonlinear Landau damping of plasma waves with orbital angular momentum
复制标题
具有轨道角动量的等离子体波的非线性朗道阻尼
DOI：
10.1103/physreve.102.033208
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发表时间：
2020
影响因子：
2.4
通讯作者：
Tikhonchuk, V. T.
中科院分区：
文献类型：
--
作者：
Blackman, D. R.;Nuter, R.;Korneev, Ph.;Tikhonchuk, V. T.
我们利用三维粒子胞内模拟，观察到当拉盖尔-高斯等离子体波受到朗道阻尼时，轨道角动量（OAM）与纵向动量成比例地转移到共振电子。较高的方位角模数导致较大的净轨道角动量转移到接近等离子体波相速度的粒子上，这意味着有大量电子绕着等离子体波的相同旋转中心运行。这一观察结果对由于OAM等离子体波的形成和阻尼而产生的磁场激发具有启示意义。阻尼拉盖尔-高斯等离子体波中电子的能量分布随方位角模数的变化而发生显著变化。这导致大量低能量粒子趋向于加速粒子能量分布的显著缩小。
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.