论文标题
通过强烈激光与过度血浆的相互作用的自发形成磁偶极子
Spontaneous formation of magnetic dipoles by interaction of intense laser with overdense plasma
论文作者
论文摘要
当激光场出现在过度密度的血浆上时，它无法穿透其中。然而，其一部分能量通过多种机制（例如真空和$ \ vec {j} \ times \ vec {b}）加热[1，2]）。等离子体内这些能量电子的动力学是一个引起人们关注的领域。这里使用2-D PIC（粒子中的粒子）模拟证明，当高强度激光脉冲入射到过度密度的目标上时，能量电子会产生，从而自发地组织自己以形成连贯的结构。观察到这些相干结构具有与EMHD（电子磁流体动力学）模型的溶液所显示的相似的动力学性状[3]。值得注意的是，EMHD是一个近似模型，适用于非偏见电子的动力学。但是，在这些模拟中，由于激光强度显着高，电子能量处于相对论方案中。因此，它表明相对论动力学也允许存在强大的相干结构。在模拟中观察到有趣的动力学行为，这表明相干结构将背景电子折叠起来，然后以较高的能量发射它们。
When a laser field is incident on an overdense plasma it is unable to penetrate inside it. Nevertheless, a part of its energy gets transferred to the electrons through a variety of mechanisms (e.g. vacuum and $\vec{J}\times \vec{B}) heating [1, 2]). The dynamics of these energetic electrons inside the plasma is a field of great interest. It is demonstrated here using 2-D PIC (Particle-In-Cell) simulation that when a high intensity laser pulse is incident on an overdense target, energetic electrons get generated which spontaneously organize themselves to form coherent structures. These coherent structures are observed to have similar dynamical traits as displayed by the solutions of the EMHD (Electron Magnetohydrodynamic) model [3]. This is noteworthy that EMHD is an approximate model and is applicable for the dynamics of non-relativistic electrons. However, in these simulations, the electron energy is in the relativistic regime as the laser intensity is significantly high. Thus, it shows that the relativistic dynamics also permits the existence of robust coherent structures. Interesting kinetic behaviour at particle level is observed in the simulation which shows that the coherent structures take background electrons in its fold and subsequently emit them at a higher energy.
