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首页> 外文期刊>Physics of plasmas >A 2D simulation study of Langmuir, whistler, and cyclotron maser instabilities induced by an electron ring-beam distribution
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A 2D simulation study of Langmuir, whistler, and cyclotron maser instabilities induced by an electron ring-beam distribution

机译：电子环束分布引起的朗缪尔，惠斯勒和回旋加速器激射体不稳定性的二维模拟研究

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摘要

We carried out a series of 2D simulations to study the beam instability and cyclotron maser instability (CMI) with the initial condition that a population of tenuous energetic electrons with a ring-beam distribution is present in a magnetized background plasma. In this paper, weakly relativistic cases are discussed with the ring-beam kinetic energy ranging from 25 to 100 keV. The beam component leads to the two-stream or beam instability at an earlier stage, and the beam mode is coupled with Langmuir or whistler mode, leading to excitation of beam-Langmuir or beam-whistler waves. When the beam velocity is large with a strong beam instability, the initial ring-beam distribution is diffused in the parallel direction rapidly. The diffused distribution may still support CMI to amplify the X1 mode (the fundamental X mode). On the contrary, when the beam velocity is small and the beam instability is weak, CMI can amplify the Z1 (the fundamental Z mode) effectively while the O1 (the fundamental O mode) and X2 (the second harmonic X mode) modes are very weak and the X1 mode is not excited. In this report, different cases with various parameters are presented and discussed for a comprehensive understanding of ring-beam instabilities.
机译：我们进行了一系列二维模拟，以研究束不稳定性和回旋加速器马赛尔不稳定性（CMI），其初始条件是在磁化的背景等离子体中存在具有环形电子束分布的微弱高能电子。在本文中，我们讨论了环束动能在25至100 keV之间的弱相对论情形。光束分量在较早的阶段导致两流或光束不稳定，并且光束模式与朗缪尔或惠斯勒模式耦合，从而导致光束朗格缪尔或光束惠斯勒波的激发。当光束速度大且光束不稳定时，初始的环形光束分布会迅速在平行方向上扩散。分散的分布可能仍支持CMI来放大X1模式（基本X模式）。相反，当光束速度小且光束不稳定时，CMI可以有效放大Z1（基本Z模式），而O1（基本O模式）和X2（二次谐波X模式）模式非常有效。弱，并且X1模式不兴奋。在本报告中，提出并讨论了具有各种参数的不同情况，以全面了解环形梁的不稳定性。

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