标题： 碰撞辐射流中的冷却和不稳定性以及环形磁场 显示英文标题

标题： Cooling and Instabilities in Colliding Radiative Flows with Toroidal Magnetic Fields

摘要： 我们报告了关于碰撞磁化等离子体流的仿真研究结果。 我们的设置模拟了脉冲功率实验室天体物理实验，但通过适当的参考系变换，也适用于具有内部速度变化的天体物理喷流。 我们跟踪了两个流碰撞的相互作用区域的演化。 计算中包含了通过辐射损失的冷却过程。 我们系统地改变流中的等离子体β（$\beta_m$）、冷却强度（$\Lambda_0$）以及冷却函数温度依赖性的指数（$\alpha$）。 我们发现，在强磁场情况下，由受激环形场的压力驱动了一个反向传播的喷流，称为“脊”（spine）。 这些脊最终变得不稳定并破裂。 我们展示了脊的形成和演化如何依赖于初始流参数，并提供了一个简单的解析模型，能够捕捉流动的基本特征。 显示英文摘要

摘要： We report on the results of a simulation based study of colliding magnetized plasma flows. Our set-up mimics pulsed power laboratory astrophysical experiments but, with an appropriate frame change, are relevant to astrophysical jets with internal velocity variations. We track the evolution of the interaction region where the two flows collide. Cooling via radiative loses are included in the calculation. We systematically vary plasma beta ($\beta_m$) in the flows, the strength of the cooling ($\Lambda_0$) and the exponent ($\alpha$) of temperature-dependence of the cooling function. We find that for strong magnetic fields a counter-propagating jet called a "spine" is driven by pressure from shocked toroidal fields. The spines eventually become unstable and break apart. We demonstrate how formation and evolution of the spines depends on initial flow parameters and provide a simple analytic model that captures the basic features of the flow.