论文标题
来自Cherenkov的相对论拓扑波和自磁性激光等离子体中的多普勒共振
Relativistic Topological Waves from Cherenkov and Doppler Resonances in Self-Magnetized Laser Plasmas
论文作者
论文摘要
血浆界面处的强磁场可以自然在激光 - 血浆相互作用中产生。使用理论分析和完全三维的粒子中的粒子模拟，我们证明了相对论拓扑波可以通过Cherenkov和多普勒共振在激烈的飞秒激光脉冲与近临界密度等化的相互作用的相互作用中产生。在自磁化等离子体 - 血浆接口处，出现了一个新的慢波分支。它的相速度比激光脉冲的组速度和电子束速度小得多。因此，Cherenkov共振条件很容易得到满足。此外，由于电子经历了Betatron振荡，因此可能会发生多普勒共振，并负责激发我们的模拟中观察到的几个频移分支。通过激光脉冲通过后，我们观察到一个快速残余模式，相对论幅度和频率接近局部等离子体频率。即使激光脉冲离开等离子体，这种模式仍继续在许多激光周期内进一步加速电子。
Strong magnetic fields at plasma-plasma interfaces can be naturally produced in laser-plasma interactions. Using theoretical analysis and fully three-dimensional particle-in-cell simulations, we demonstrate that relativistic topological waves can be generated via Cherenkov and Doppler resonances in the interaction of intense femtosecond laser pulses with near-critical-density plasmas. At the self-magnetized plasma-plasma interface, a new slow-wave branch appears. Its phase velocity is much smaller than the group velocity of the laser pulse and the electron beam velocity. Therefore, the Cherenkov resonance condition can be easily satisfied. Furthermore, since electrons undergo betatron oscillations, Doppler resonances may also occur and are responsible for the excitation of several frequency-shifted branches observed in our simulations. After the passage of the laser pulse, we observe a fast remnant mode with relativistic amplitude and frequency close to the local plasma frequency. This mode continues to accelerate electrons further for many tens of laser periods even after the laser pulse has left the plasma.
