相对论效应对BGK模的稳定作用
Stabilisation of BGK modes by relativistic effects
摘要：
我们调查的电子加速通过它们与静电波的相互作用，驱动的相对论布尼曼不稳定性，在一个系统中占主导地位的反向传播质子束。我们观察到这些波的增长和随后的饱和通过电子捕获的质子束速度范围内，从0.15 C到0.9 C。我们可以报告一个减少的稳定性的静电波（ESW）与增加非相对论性的电子束速度和提高波的稳定性增加相对论性的电子束速度，无论是根据以前的研究结果。在最高的光束速度，我们发现该系统是稳定的~160等离子体周期的一段时间。此外，我们观察到，据我们所知，以前未报道的次级电子加速机制在低束速。我们认为，这是参数耦合的结果，产生高相速度ESW的，然后陷阱电子，加速它们到更高的能量。这使得我们的模拟研究中的电子能够实现费米加速所需的注入能量，在未磁化等离子体中的电子束速度低至0.15c。
英文摘要：
We investigate the acceleration of electrons via their interaction with electrostatic waves, driven by the relativistic Buneman instability, in a system dominated by counter-propagating proton beams. We observe the growth of these waves and their subsequent saturation via electron trapping for a range of proton beam velocities, from 0.15c to 0.9c. We can report a reduced stability of the electrostatic wave (ESW) with increasing non-relativistic beam velocities and an improved wave stability for increasing relativistic beam velocities, both in accordance with previous findings. At the highest beam speeds, we find the system to be stable again for a period of ~160 plasma periods. Furthermore we observe a, to our knowledge, previously unreported secondary electron acceleration mechanism at low beam speeds. We believe that it is the result of parametric couplings to produce high phase velocity ESW's which then trap electrons, accelerating them to higher energies. This allows electrons in our simulation study to achieve the injection energy required for Fermi acceleration, for beam speeds as low as 0.15c in unmagnetised plasma.
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