论文标题
超级阿尔菲波的重离子加速
Heavy Ion Acceleration by Super-Alfvenic Waves
论文作者
论文摘要
提出了多离子物种等离子体中超级αNNIC（SPA）波的产生机制，并讨论了相关的重离子加速过程。水疗波被认为在颗粒加速度中起着重要作用，因为它们的高相速度具有较大的波电场。通过使用完整的粒子中的模拟证明，大幅度质子回旋体波，由于质子温度各向异性而激发，通过参数衰减不稳定性在由电子，质子和$α$颗粒组成的三个成分等离子体组成的参数衰减不稳定性中非线性破坏了SPA波。同时，$α$ Cyclotron Waves通过另一种衰减不稳定而激发。预先加速的$α$粒子与两个子波，水疗波和$α$回旋体波同时共鸣，并进一步加速垂直于环境磁场。该过程可能在较低质量离子的足够大温度各向异性的天体物理环境中起作用。
A generation mechanism of super Alfvénic (SPA) waves in multi-ion species plasma is proposed and the associated heavy ion acceleration process is discussed. The SPA waves are thought to play important roles in particle acceleration since they have large wave electric field because of their high phase velocity. It is demonstrated by using full particle-in-cell simulation that large amplitude proton cyclotron waves, excited due to proton temperature anisotropy, nonlinearly destabilize SPA waves through parametric decay instability in a three component plasma composed of electrons, protons, and $α$ particles. At the same time, $α$ cyclotron waves get excited via another decay instability. A pre-accelerated $α$ particle resonates simultaneously with the two daughter waves, the SPA waves and the $α$ cyclotron waves, and it is further accelerated perpendicular to the ambient magnetic field. The process may work in astrophysical environments where sufficiently large temperature anisotropy of lower mass ions occurs.
