ACCELERATION IN PERPENDICULAR RELATIVISTIC SHOCKS FOR PLASMAS CONSISTING OF LEPTONS AND HADRONS
ACCELERATION IN PERPENDICULAR RELATIVISTIC SHOCKS FOR PLASMAS CONSISTING OF LEPTONS AND HADRONS
复制标题
轻子和强子组成的等离子体垂直相对论激波的加速
DOI：
10.1088/0004-637x/755/1/68
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
L. Silva
中科院分区：
文献类型：
--
作者：
A. Stockem;F. Fiuza;R. Fonseca;L. Silva
本文研究了轻子粒子和强子粒子混合的等离子体在垂直激波中的加速问题。从完整的混合等离子体成分的守恒方程组出发，我们概括了多组分等离子体的磁流体动力学跳跃条件，包括不同物种的特定绝热常数的信息。从理想气体的标准模型的偏差的影响进行了比较，在理论和粒子在细胞模拟，表明标准MHD模型是一个很好的近似。电子-正电子-离子等离子体中的冲击的模拟是第一次多维的，在这种配置中横向效应是小的，并且如果初始磁化被选择为高的，则一维（1D）模拟是一个很好的表示。进行了质量比为1836的一维实验，确定了Larmor频率ωci是决定混合成分等离子体中激波物理的主要频率。粒子谱的非热尾部的最大能量随时间按照幂律α tα演化，α在1/3 < α < 1的范围内，取决于初始参数。与德鲁里、加加特和斯皮特科夫斯基的输运理论模型建立了联系，该模型预测了加速时间<$γ，与柯克和雷维尔的小波长散射理论建立了联系，该理论预测了行为，而不是<$γ2。此外，我们比较不同的磁场方向与B 0内和平面外，观察定性不同的粒子谱比纯电子-离子冲击。
We investigate the acceleration of light particles in perpendicular shocks for plasmas consisting of a mixture of leptonic and hadronic particles. Starting from the full set of conservation equations for the mixed plasma constituents, we generalize the magnetohydrodynamical jump conditions for a multi-component plasma, including information about the specific adiabatic constants for the different species. The impact of deviations from the standard model of an ideal gas is compared in theory and particle-in-cell simulations, showing that the standard MHD model is a good approximation. The simulations of shocks in electron–positron–ion plasmas are for the first time multi-dimensional, transverse effects are small in this configuration, and one-dimensional (1D) simulations are a good representation if the initial magnetization is chosen high. 1D runs with a mass ratio of 1836 are performed, which identify the Larmor frequency ωci as the dominant frequency that determines the shock physics in mixed component plasmas. The maximum energy in the non-thermal tail of the particle spectra evolves in time according to a power law ∝tα with α in the range 1/3 < α < 1, depending on the initial parameters. A connection is made with transport theoretical models by Drury and Gargaté & Spitkovsky, which predict an acceleration time ∝γ and the theory for small wavelength scattering by Kirk & Reville, which predicts a behavior rather as ∝γ2. Furthermore, we compare different magnetic field orientations with B0 inside and out of the plane, observing qualitatively different particle spectra than in pure electron–ion shocks.
相对论二流体流体动力学中的非线性波和冲击
影响因子：
2.5
作者：
HAIM L
通讯作者：
HAIM L