论文标题
激发激光血浆相互作用中较低的杂种和磁性扰动的激发
Excitation of lower hybrid and magneto-sonic perturbations in laser plasma interaction
论文作者
论文摘要
较低的杂种（LH）和磁性（MS）波是众所周知的磁化等离子体模式。这些模式在许多现象中都起着重要作用。较低的杂种波通常用于磁性限制融合实验中，用于当前驱动和加热目的。在各种天体物理和空间等离子体观测中都观察到LH和MS波。这些波涉及离子运动，因此在高功率脉冲激光实验中尚未考虑。 This paper shows, with the help of Particle - In - Cell (PIC) simulations, a simple mechanism for excitation of lower hybrid and magnetosonic excitations in the context of laser plasma interaction.已经提供了一项表征这些模式形成和传播的详细研究。产生这些扰动的方案依赖于在血浆中使用强磁场来限制激光电场中较轻电子物种的运动。选择磁场强度以使较重的离子在激光频率下未磁化。这有助于激发LH波。另一方面，在与激光脉冲持续时间相关的较慢的时间尺度下，即使离子也显示出磁化响应，并且观察到磁性激发会激发。
Lower hybrid (LH) and magneto-sonic (MS) waves are well known modes of magnetized plasma. These modes play important roles in many phenomena. The lower hybrid wave is often employed in magnetic confinement fusion experiments for current drive and heating purposes. Both LH and MS waves are observed in various astrophysical and space plasma observations. These waves involve ion motion and have not therefore been considered in high power pulsed laser experiments. This paper shows, with the help of Particle - In - Cell (PIC) simulations, a simple mechanism for excitation of lower hybrid and magnetosonic excitations in the context of laser plasma interaction. A detailed study characterising the formation and propagation of these modes have been provided. The scheme for generating these perturbations relies on the application of a strong magnetic field in the plasma to constrain the motion of lighter electron species in the laser electric field. The magnetic field strength is chosen so as to leave the heavier ions un-magnetized at the laser frequency. This helps in the excitation of the LH waves. On the other hand at the slower time scale associated with the laser pulse duration, even the ions show a magnetized response and magnetosonic excitations are observed to get excited.
