arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2309.00366physics.plasm-phastro-ph.HE
收藏

极端辐射-等离子体相互作用中的高能加速现象

High-energy acceleration phenomena in extreme radiation-plasma interactions

J. C. Faure, D. Tordeux, L. Gremillet, M. Lemoine

AI总结:

本文通过粒子网格模拟研究极端辐射-等离子体相互作用中的高能加速链,揭示康普顿散射、电荷分离场及韦伯不稳定性驱动的电子加速机制,并给出解析描述。

摘要:

我们使用粒子网格(particle-in-cell)代码模拟了基于康普顿(Compton)散射的稀薄电子-离子等离子体与极端强度、非相干伽马射线通量相互作用过程中的一系列加速过程,其中光子密度比粒子密度高出数个数量级。等离子体电子最初通过康普顿散射在辐射通量方向上被加速。随后,由感应电流产生的电荷分离场将等离子体离子驱动到近相对论速度,并将未散射的电子反向加速到能量轻易超过驱动光子的水平。这些被激发电子的动力学由静电加速、等离子体整体运动、逆康普顿散射以及由韦伯(Weibel)型不稳定性产生的移动磁涨落引起的偏转之间的相互作用决定。后者类似费米(Fermi)的效应尤其产生了前向的超热电子尾。我们为上述大多数现象提供了简单的解析描述,并数值上检验了它们对问题参数的敏感性。

英文摘要:

We simulate, using a particle-in-cell code, the chain of acceleration processes at work during the Compton-based interaction of a dilute electron-ion plasma with an extreme-intensity, incoherent gamma-ray flux with a photon density several orders of magnitude above the particle density. The plasma electrons are initially accelerated in the radiative flux direction through Compton scattering. In turn, the charge-separation field from the induced current drives forward the plasma ions to near-relativistic speed and accelerates backwards the non-scattered electrons to energies easily exceeding those of the driving photons. The dynamics of those energized electrons is determined by the interplay of electrostatic acceleration, bulk plasma motion, inverse Compton scattering and deflections off the mobile magnetic fluctuations generated by a Weibel-type instability. The latter Fermi-like effect notably gives rise to a forward-directed suprathermal electron tail. We provide simple analytical descriptions for most of those phenomena and examine numerically their sensitivity to the parameters of the problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑