论文标题
在有界等离子体中的离子 - 单调不稳定性饱和度中的自我加速和能量通道
Self-acceleration and energy channeling in the saturation of the ion-sound instability in a bounded plasma
论文作者
论文摘要
在一维PIC模拟中揭示了一个在有限的离子束 - 铂系统中Pierce型离子隔离不稳定性饱和度的新型制度。发现不稳定性的饱和度是由振荡的虚拟阳极电位结构介导的。定期振荡的潜在屏障将传入的束离子分为两组。一个组件形成一个超音速束，该束被加速到超过初始冷离子束能量的能量。另一个组件是将宽的离子的自洽相空间结构组织起来的，具有广泛的能量扩散 - 离子孔。被困在孔中的离子的有效温度（能量扩散）低于初始梁能量。在最后阶段，离子孔在整个系统长度上膨胀。
A novel regime of the saturation of the Pierce-type ion-sound instability in bounded ion-beam-plasma system is revealed in 1D PIC simulations. It is found that the saturation of the instability is mediated by the oscillating virtual anode potential structure. The periodically oscillating potential barrier separates the incoming beam ions into two groups. One component forms a supersonic beam which is accelerated to an energy exceeding the energy of the initial cold ion beam. The other component is organized as a self-consistent phase space structure of trapped ions with a wide energy spread - the ion hole. The effective temperature (energy spread) of the ions trapped in the hole is lower than the initial beam energy. In the final stage the ion hole expands over the whole system length.
