论文标题
反梁电子等离子体的消防状态的上不稳定性
A firehose-like aperiodic instability of the counter-beaming electron plasmas
论文作者
论文摘要
根据涉及的物理条件，梁等离子体系统可能会揭示由不同性质的波浪不稳定性触发的新的不稳定态度。我们通过线性理论和数值模拟表明，在正常磁场沿着相对漂移（$ v_d $，$ v_d $，足够小，不超过粒子热速度，$α_E$）的相对漂移，$ v_d $，$α_E$ $ $ $ $。在高度倾斜的角度出现这种模式类似于温度各向异性驱动的大道消防不稳定性的特性。通过增加相对漂移或/和降低等离子体β参数的高增长率导致波动磁场功率的显着饱和水平，这解释了电子的相对快速松弛。对于$ v_d>α_e$，这种不稳定性可以与静电两流的不稳定性共存，在$ v_d $放松到小于热速度的值之后，就会在血浆的长期动力学上占主导地位。
Depending on the physical conditions involved the beam plasma systems may reveal new unstable regimes triggered by the wave instabilities of different nature. We show through linear theory and numerical simulations the existence of an aperiodic electromagnetic instability which solely develops and control the stability of two symmetric plasma populations counter-moving along the regular magnetic field with a relative drift, $v_d$, small enough to not exceed the particle thermal speed, $α_e$. Emerging at highly oblique angles this mode resembles properties of the aperiodic firehose instability driven by temperature anisotropy. The high growth rates achieved with increasing the relative drift or/and decreasing the plasma beta parameter lead to significant saturation levels of the fluctuating magnetic field power, which explain the relative fast relaxation of electrons. For $v_d>α_e$ this instability can coexist with the electrostatic two-stream instability, dominating the long-term dynamics of the plasma as soon as $v_d$ has relaxed to values smaller than the thermal speed.
