Particle Acceleration and Dynamics of Relativistic Plasma SheetMediated by Radiation Loss

在相对论性磁重联过程中产生的相对论性粒子会遭受同步辐射损失，因为需要强大的磁场将相对论性热等离子体限制在等离子体片中。利用相对论电磁、粒子单元码，利用同步辐射效应对非线性动力学及其粒子加速度进行了研究。结果发现，由于辐射损失导致气体压力降低，通过反馈效应可以实现快速磁重联。除了上述孤立重联系统外，我们还研究了具有多个磁岛的复杂系统，发现粒子加速效率得到了显著提高。

Relativistic particles generated in the course of relativistic magnetic reconnection is subject to the synchrotron radiation loss, because the strong magnetic field is needed to confine the relativistic hot plasma in the plasma sheet. The nonlinear dynamics and its particle acceleration is investigated by means of a relativistic electro-magnetic, particle-in-cell code, in which the synchrotron radiation effect is implemented. As a result, we found that fast magnetic reconnection can occur by the feedback effect of the reduction of gas pressure due to the radiation loss. In addition to the above isolated reconnection system, we also studied the complex system with multiple magnetic islands, and found that the efficiency of particle acceleration is dramatically improved.