中等相对论性电子环-束引起的束迴旋不稳定性 |
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引用本文: | 周国成.中等相对论性电子环-束引起的束迴旋不稳定性[J].空间科学学报,1988,8(3):168-176. |
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作者姓名: | 周国成 |
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作者单位: | 中国科学院空间科学与应用研究中心 北京 |
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摘 要: | 本文研究了在电子等离子体频率ωe远大于电子迴旋频率Ωe的等离子体内,由中等相对论性电子环-束激发的高频(ω≥ωe)束迴旋不稳定性。结果表明,高能电子束迴旋模在N2cos2θ<1和N2cos2θ>1范围内都是不稳定的,在N2cos2θ=1时是稳定的,这里N为折射指数,θ为传播角。当束迴旋模频率近乎等于冷背景等离子体本征模频率之一(ω≈ωe)时增长率最大。文中介绍和讨论了色散方程的数值计算结果。
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收稿时间: | 1987-09-28 |
Beam-Cyclotron Instabilities by Moderately Relativistic Electron Ring-Beam |
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Institution: | Institute of Space Physics, Academia Sinica, Beijing |
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Abstract: | High frequency (ω>ωe) beam-cyclotron instabilities excited by moderately Jelativistic electron ring-beam are studied in regions where the electron plasma fre-quency wc is much higher than the electron cyclotron frequency Qe(i.e.ωe2>>Me2).It is found that the beam-cyclotron modes of energetic electrons are unstable in the cases of N2cos2θ<1 and N2cos2θ>and stable in the case of N2cos2θ=1,where N is the refractive index and d is the propagation angle.When the frequency of beam-cyclotron mode is nearly one of the eigenmodes of cold background plasma,i.e.to ≈ωe,the growth rate is the largest.Numerical solutions of the dispersion equation are also presented and discussed in this paper. |
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