Transport of intense particle beams in large-scale plasmas
Transport of intense particle beams in large-scale plasmas
复制标题
强粒子束在大尺度等离子体中的传输
DOI：
10.1103/physreve.101.051203
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发表时间：
2020-05-26
影响因子：
2.4
通讯作者：
Zhao, Y. T.
中科院分区：
文献类型：
--
作者：
Chen, B. Z.;Wu, D.;Zhao, Y. T.
粒子束在等离子体中的输运在基础研究、工业和医学中有着广泛的应用。由于离子束的高惯性，它们在等离子体中的传输通常被认为是稳定的。在这里，我们报告的聚焦和拍打强烈的平板质子束通过大尺度等离子体传输使用最近开发的动力学粒子模拟代码。模拟结果表明，光束自聚焦效应显著，与已有的实验和理论结果吻合较好。此外，随着光束密度的增加，光束可以弯曲和拍打湍流。模拟和分析表明，碰撞等离子体运动产生的自生磁场是这种行为的主要驱动力。通过分析注入质子束的磁能空间增长率和能量沉积，发现注入质子束的密度和能量对聚焦和摆动有重要影响。此外，还观察到了显著的非线性束流能量损失。我们的研究可能会在惯性约束聚变中找到应用，也可能会引起实验室天体物理界的兴趣。
Transport of particle beams in plasmas is widely employed in fundamental research, industry, and medicine. Due to the high inertia of ion beams, their transport in plasmas is usually assumed to be stable. Here we report the focusing and flapping of intense slab proton beams transporting through large-scale plasmas by using a recently developed kinetic particle-in-cell simulation code. The beam self-focusing effect in the simulation is prominent and agrees well with previous experiments and theories. Moreover, the beam can curve and flap like turbulence as the beam density increases. Simulation and analysis indicate that the self-generated magnetic fields, produced by movement of collisional plasmas, are the dominant driver of such behaviors. By analyzing the spatial growth rate of magnetic energy and energy deposition of injected proton beams, it is found that the focusing and flapping are significantly determined by the injected beam densities and energies. In addition, a remarkable nonlinear beam energy loss is observed. Our research might find application in inertial confinement fusion and also might be of interest to the laboratory astrophysics community.