论文标题
通过反向传播圆两极化的alfvén波加速粒子加速
Particle acceleration by counter-propagating circularly polarized Alfvén waves
论文作者
论文摘要
在许多天体物理环境（例如恒星表面和行星预换）中，会观察到反封闭的alfvén波。我们讨论了两个反向传播圆极化的alfvén波中有效的粒子加速机制。当波幅度超过两个临界值时，会发生粒子行为的相变。在临界幅度上方，数值模拟表明，一旦形成相干波形，任何粒子在短时间内不可逆转地获得相对论能量。加速粒子具有空间连贯性。较高的波相速度需要较小的临界幅度，而随着波数和频率的降低，最大可达到的能量会增加。结果可能适用于某些天体物理现象，以及使用高功率激光器的未来实验室实验。
Counterpropagating Alfvén waves are ubiquitously observed in many astrophysical environments, such as a star surface and a planetary foreshock. We discuss an efficient particle acceleration mechanism in two counterpropagating circularly polarized Alfvén waves. Phase transitions of particle behavior occur when wave amplitudes exceed two critical values. Above the critical amplitudes, the numerical simulation shows that any particles irreversibly gain relativistic energy within a short time regardless of their initial position and energy once the coherent waveform is formed. The accelerated particles have spatial coherence. Higher wave phase velocity requires smaller critical amplitudes, while the maximum attainable energy increases as the wavenumber and the frequency decrease. The results may be applicable in some astrophysical phenomena, as well as a future laboratory experiment using high-power lasers.
