论文标题

带有环形磁场的相对论喷气机的3D PIC模拟

3D PIC Simulations for Relativistic Jets with a Toroidal Magnetic Field

论文作者

Meli, A., Nishikawa, K., Koehn, C., Dutan, I., Mizuno, Y., Kobzar, O., MacDonald, N., Gomez, J. L., Hirotani, K.

论文摘要

我们已经研究了动力学不稳定性(WI),蘑菇不稳定性(MI)和动力学开尔文 - 霍尔姆霍尔茨不稳定性(KKHI)等动力学不稳定性如何在没有旋转磁场的喷气机中激发,以及这种不稳定性如何导致粒子加速。在这项工作中,我们使用了一种新的喷射注射方案,其中电流是由产生环形磁场的射流颗粒在喷气孔中自谐生成的。我们进行了五个不同的模拟,可以在足够长的时间内检查射流演化的非线性效应。我们注入未吸收的e^{\ pm}和e^{ - } - p^{+}(m_p/m_e = 1836),以及磁化的e^{\ pm}和e^{\ pm}和e^{ - } - i^{+}(+}(m_i/m_e = 4)与顶部的jets a grops a uncmas一起使用,将其组合为jets of pot and jet lims jet lims jet dimmas。我们表明,WI,MI和KKHI在线性阶段感到兴奋,它们会产生电场加速和减速电子的非振荡X分量。我们发现,两个不同的喷气组合物(E^{\ pm}和E^{ - } - i^{+})分别显示不同的不稳定模式。此外,不同不稳定性产生的非线性阶段的磁场被消散并重组为新的拓扑结构。 3D磁场拓扑描述表明在非线性阶段可能的重新连接位点,在该阶段,通过与可能的重新连接事件相关的磁场的耗散,颗粒显着加速了颗粒。

We have investigated how kinetic instabilities such as the Weibel instability (WI), the mushroom instability (MI), and the kinetic Kelvin-Helmholtz instability (kKHI) are excited in jets without and with a toroidal magnetic field, and how such instabilities contribute to particle acceleration. In this work we use a new jet injection scheme where an electric current is self-consistently generated at the jet orifice by the jet particles which produce the toroidal magnetic field. We perform five different simulations for a sufficiently long time to examine the non-linear effects of the jet evolution. We inject unmagnetized e^{\pm} and e^{-} - p^{+} (m_p/m_e = 1836), as well as magnetized e^{\pm} and e^{-} - i^{+} (m_i/m_e = 4) jets with a top-hat jet density profile into an unmagnetized ambient plasmas of the same species. We show that WI, MI, and kKHI excited at the linear stage, generate a non-oscillatory x-component of the electric field accelerating and decelerating electrons. We find that the two different jet compositions (e^{\pm} and e^{-} - i^{+}) display 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 event.

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