论文标题
贝尔不稳定性饱和的动力学研究
A Kinetic Study of the Saturation of the Bell Instability
论文作者
论文摘要
贝尔（Bell，2004）预测的非共振宇宙射线不稳定性在接近超新星残留物的宇宙射线（CR）的加速和限制中起着重要作用。尽管它的重要性，但尚未确定导致不稳定性饱和的确切机制，并且对于饱和磁场的振幅没有第一原则预测。使用对自洽的混合模拟（具有动力学和流体电子）的调查，我们研究了贝尔不稳定性的非线性演化，这是CR群体参数的函数。我们发现，当放大场中的磁压与初始CR动量通量相当时，就可以实现饱和。
The nonresonant cosmic ray instability, predicted by Bell (2004), is thought to play an important role in the acceleration and confinement of cosmic rays (CR) close to supernova remnants. Despite its importance, the exact mechanism responsible for the saturation of the instability has not been determined, and there is no first-principle prediction for the amplitude of the saturated magnetic field. Using a survey of self-consistent hybrid simulations (with kinetic ions and fluid electrons), we study the non-linear evolution of the Bell instability as a function of the parameters of the CR population. We find that saturation is achieved when the magnetic pressure in the amplified field is comparable to the initial CR momentum flux.
