Electromagnetic instabilities and gyrophase-bunched particles
Electromagnetic instabilities and gyrophase-bunched particles
复制标题
电磁不稳定性和陀螺相束粒子
DOI：
10.1063/1.865441
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发表时间：
1986
影响因子：
4.6
通讯作者：
S. Fuselier
中科院分区：
文献类型：
--
作者：
S. Gary;M. Thomsen;S. Fuselier
利用平行或反平行于均匀磁场B（0）传播的电磁不稳定性线性理论计算第j个分量的脉动速度矢量与脉动磁场之间的相对相位角ψj。一个标准，确定当这种相位关系导致可观察到的gyrophase群聚在线性增长阶段的不稳定性也来自。该理论被应用到聚束的离子成分的离子束不稳定性。在电磁冷离子束不稳定性中，发现右手谐振模最有可能在线性增长过程中引起可观察到的离子束的回旋相位聚束，并且对于足够大的束芯相对漂移速度，对于平行于B（0）的不稳定性传播，在最大增长时，ε B <90°。
The linear theory of electromagnetic instabilities at propagation parallel or antiparallel to a uniform magnetic field B(0) is used to calculate the relative phase angle ψj between the fluctuating velocity vector of the jth component and the fluctuating magnetic field. A criterion that determines when this phase relationship leads to observable gyrophase bunching during the linear growth phase of an instability is also derived. The theory is applied to bunching of ion components by ion beam instabilities. Among the electromagnetic cool ion beam instabilities, it is found that the right‐hand resonant mode is most likely to cause observable gyrophase bunching of an ion beam during linear growth, and that for sufficiently large beam–core relative drift speeds, ψb ≂90° at maximum growth for instability propagation parallel to B(0).