Stability of an ion-ring distribution in a multi-ion component plasma
Stability of an ion-ring distribution in a multi-ion component plasma
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多离子组分等离子体中离子环分布的稳定性
DOI：
10.1063/1.3372842
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发表时间：
2010
影响因子：
2.2
通讯作者：
G. Ganguli
中科院分区：
文献类型：
--
作者：
M. Mithaiwala;L. Rudakov;G. Ganguli
分析了热等离子体中冷离子环速度分布的稳定性。特别考虑了等离子体温度和密度对不稳定性的影响。较高的环密度(与背景等离子体相比)中和了热背景等离子体的稳定作用，即使对于非常高温的等离子体，环对低于低混杂频率的波的产生也是不稳定的。对于低于背景等离子体密度的环密度，当增长速率小于背景离子回旋频率时，存在缓慢的不稳定性，因此，背景离子响应是磁化的。这是对广泛讨论的快速不稳定性的补充，在快速不稳定性中，波的增长率超过背景离子回旋频率，因此背景离子实际上是非磁化的。因此，即使是低密度环对于任何环速度的低混合频率范围内的波也是不稳定的。这意味着实际上没有速度阈值。
The stability of a cold ion-ring velocity distribution in a thermal plasma is analyzed. In particular, the effect of plasma temperature and density on the instability is considered. A high ring density (compared to the background plasma) neutralizes the stabilizing effect of the warm background plasma and the ring is unstable to the generation of waves below the lower-hybrid frequency even for a very high temperature plasma. For ring densities lower than the background plasma density, there is a slow instability where the growth rate is less than the background-ion cyclotron frequency and, consequently, the background-ion response is magnetized. This is in addition to the widely discussed fast instability where the wave growth rate exceeds the background-ion cyclotron frequency and hence the background ions are effectively unmagnetized. Thus, even a low density ring is unstable to waves around the lower-hybrid frequency range for any ring speed. This implies that effectively there is no velocity threshold...