Rapid generation of Langmuir wave packets during electron beam-plasma instabilities
Rapid generation of Langmuir wave packets during electron beam-plasma instabilities
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DOI：
10.1063/1.871963
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发表时间：
1996-07
影响因子：
2.2
通讯作者：
K. Akimoto;Y. Omura;H. Matsumoto
中科院分区：
文献类型：
--
作者：
K. Akimoto;Y. Omura;H. Matsumoto
研究了朗缪尔波定位的新机制。弱电子束-等离子体不稳定性的典型计算机模拟进行如下：当朗缪尔波从噪声中生长出来时，它们通过捕获对束粒子做出反应。随后的相移使电子与波异相。然后，即使在不稳定性饱和之前，不稳定性也会被局部抑制，从而导致强烈的波调制。波包的典型大小由 2πvp/ωt 给出，其中 vp 和 ωt 分别表示主波的相速度和平均反弹频率。该过程的时间尺度比参数不稳定的时间尺度要短得多。
A new mechanism for Langmuir wave localization is investigated. Typical computer simulation of weak electron beam–plasma instabilities proceeds as follows: As Langmuir waves grow out of the noise, they react back on the beam particles by trapping. The subsequent phase shift puts the electrons out of phase with the waves. Then the instability is locally quenched, resulting in strong wave modulation, even before saturation of the instabilities. The typical size of wave packets is given by 2πvp/ωt, where vp and ωt denote the phase speed of the dominant wave and the average bounce frequency, respectively. The time scale for this process is considerably shorter than that of parametric instabilities.