相对论对等离子体重联中引导场的作用
The Role of the Guide Field in Relativistic Pair Plasma Reconnection
摘要：
利用线性理论和粒子模拟方法研究了Harris电流片对（$e^{\pm}$）等离子体中引导场在相对论磁重联中的作用。二维PIC模拟显示了线性不稳定性的导向场的依赖性，撕裂或重连模式是相对不敏感的，而相对论漂移扭结不稳定性（RDKI），在相对论电流片中最快的模式，是稳定的导向场。在非线性阶段的粒子加速也进行了研究。一个三维的PIC模拟表明，电流片是不稳定的RDKI，虽然小的重联发生在变形的电流片。另一个带有引导场的三维PIC模拟演示了一个完全不同的场景。二次磁重联是由倾斜不稳定性的非线性耦合触发的，我们称之为相对论漂移香肠撕裂不稳定性。因此，粒子加速的相对论导向场重联发生在三维配置。基于等离子体理论，我们讨论了引导场的一个重要作用：通过磁重联实现非热粒子加速。
英文摘要：
We study the role of the guide field in relativistic magnetic reconnection in a Harris current sheet of pair ($e^{\pm}$) plasmas, using linear theories and particle-in-cell (PIC) simulations. Two-dimensional PIC simulations exhibit the guide field dependence to the linear instabilities; the tearing or reconnection modes are relatively insensitive, while the relativistic drift-kink instability (RDKI), the fastest mode in a relativistic current sheet, is stabilized by the guide field. Particle acceleration in the nonlinear stage is also investigated. A three-dimensional PIC simulation demonstrates that the current sheet is unstable to the RDKI, although small reconnection occurs in the deformed current sheet. Another three-dimensional PIC simulation with a guide field demonstrates a completely different scenario. Secondary magnetic reconnection is triggered by nonlinear coupling of oblique instabilities, which we call the relativistic drift-sausage tearing instability. Therefore, particle acceleration by relativistic guide field reconnection occurs in three-dimensional configuration. Based on the plasma theories, we discuss an important role of the guide field: to enable non-thermal particle acceleration by magnetic reconnection.
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