3D PIC Simulations for Relativistic Jets with a Toroidal Magnetic Field
3D PIC Simulations for Relativistic Jets with a Toroidal Magnetic Field
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具有环形磁场的相对论性射流的 3D PIC 模拟
DOI：
10.1093/mnras/stac3474
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
K. Hirotani
中科院分区：
文献类型：
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作者：
K. Nishikawa;A. Meli;C. Köhn;I. Duţan;Y. Mizuno;O. Kobzar;N. MacDonald;J. Gómez;K. Hirotani
摘要Particle-in-Cell模拟可以为天体物理等离子体射流的一个重要关键问题提供一个可能的答案，即环形磁场如何影响对和电子离子射流的演化。我们表明，韦伯，蘑菇，和动力学开尔文-亥姆霍兹不稳定性激发在线性阶段，产生一个准稳定的x-分量的电场，加速和减速电子。我们观察到显着的差异，由动力学不稳定性与对喷流驱动的强电磁场的结构。我们发现两种不同的喷流成分（e±和e- - i+）分别产生不同的不稳定模式。此外，由不同的不稳定性产生的非线性阶段的磁场被耗散和重组成新的拓扑结构。3D磁场拓扑描绘指示在非线性阶段中可能的重连位点，其中粒子通过与可能的重连表现相关联的磁场的耗散而显著加速。
Abstract Particle-in-Cell simulations can provide a possible answer to an important key issue for astrophysical plasma jets; namely on how a toroidal magnetic field affects the evolution of pair and electron-ion jets. We show that Weibel, mushroom, and kinetic Kelvin-Helmhotz instabilities excited at the linear stage, generate a quasi-steady x-component of the electric field which accelerates and decelerates electrons. We observe significant differences in the structure of the strong electromagnetic fields that are driven by the kinetic instabilities with the pair jet. We find that the two different jet compositions (e± and e– - i+) generate different instability modes respectively. Moreover, the magnetic field in the non-linear stage generated by different instabilities is dissipated and reorganized into new topologies. A 3D magnetic field topology depiction indicates possible reconnection sites in the non-linear stage where the particles are significantly accelerated by the dissipation of the magnetic field associated to a possible reconnection manifestation.