论文标题
由于电子和离子声波的非线性相互作用，电子在电流驱动的湍流中加热
Electron heating in a current-driven turbulence as a result of nonlinear interaction of electron- and ion-acoustic waves
论文作者
论文摘要
我们研究由于电子和离子声波之间非线性相互作用而导致无碰撞电流驱动的湍流中的电子加热。 PIC仿真结果表明，由于电子和离子平均速度之间的差异很大，Buneman不稳定性激发了大振幅离子声波，从而强烈改变了电子速度分布函数，从而导致二次不稳定性产生快速的电子声波；在此过程中，最终创建了一个巨大的电子孔。这个巨大的电子孔负责由于相混合而引起的强电子加热。数值仿真结果与先前的观察结果一致，并洞悉负责电子加热的关键过程和在无碰撞电流驱动的不稳定中产生的非线性波的产生。
We study electron heating in collisionless current-driven turbulence due to the nonlinear interactions between electron- and ion-acoustic waves. PIC simulation results show that due to a large difference between the electron and ion mean velocities the Buneman instability excites large-amplitude ion-acoustic waves, which strongly modifies the electron velocity distribution function, leading to a secondary instability that generates fast electron-acoustic waves; and in this process, a giant electron hole is ultimately created. This giant electron hole is responsible for strong electron heating due to phase mixing. The numerical simulation results are consistent with the previous observations and provide insight into the key processes responsible for electron heating and the generation of nonlinear waves in a collisionless current-driven instability.
