Cyclotron maser radiation from inhomogeneous plasmas
Cyclotron maser radiation from inhomogeneous plasmas
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DOI：
10.1063/1.3551697
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发表时间：
2011-02
影响因子：
2.2
通讯作者：
R. A. Cairns;I. Vorgul;R. Bingham;K. Ronald;D. Speirs;S. McConville;K. Gillespie;R. Bryson;A. Phelps;B. Kellett;A. Cross;C. Roberston;C. Whyte;Wenlong He
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文献类型：
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作者：
R. A. Cairns;I. Vorgul;R. Bingham;K. Ronald;D. Speirs;S. McConville;K. Gillespie;R. Bryson;A. Phelps;B. Kellett;A. Cross;C. Roberston;C. Whyte;Wenlong He
回旋微波激射器的不稳定性在空间、天体物理和实验室等离子体中非常重要。虽然人们已经对这些不稳定性做了大量的工作，但其中大部分都是关于均匀磁场的均匀等离子体，当然，在实践中，系统通常是不均匀的。在这里，我们扩展了我们以前的工作[R.A.凯恩斯，I.Vorgul，和R.Bingham，Phys。莱特牧师。101,215003(2008年)]，我们证明了在非均匀等离子体中可以存在局部不稳定区域，并且从均匀等离子体色散关系来看，波从该区域传播的方式不一定是明显的。虽然我们只考虑速度空间中简单的环分布，但由于它的易操纵性，我们的想法可能指向在存在更真实分布的情况下理解这种行为。本工作的主要目的是摆脱对局部色散关系的考虑，而是展示如何构造全局增长本征模。
Cyclotron maser instabilities are important in space, astrophysical, and laboratory plasmas. While extensive work has been done on these instabilities, most of it deals with homogeneous plasmas with uniform magnetic fields while in practice, of course, the systems are generally inhomogeneous. Here we expand on our previous work [R. A. Cairns, I. Vorgul, and R. Bingham, Phys. Rev. Lett. 101, 215003 (2008)] in which we showed that localized regions of instability can exist in an inhomogeneous plasma and that the way in which waves propagate away from this region is not necessarily obvious from the homogeneous plasma dispersion relation. While we consider only a simple ring distribution in velocity space, because of its tractability, the ideas may point toward understanding the behavior in the presence of more realistic distributions. The main object of the present work is to move away from consideration of the local dispersion relation and show how global growing eigenmodes can be constructed.