Chaotic Process in Plasma Wave System

等离子体波系统的混沌过程

• 批准号: 06452425
• 负责人: KAWAI Yoshinobu
• 金额: $ 4.03万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452425/
• 关键词: electron beam plasma system; double plasma; chaos; subharmonics; correlation dimension; 静電波動; 電子ビーム・プラズマ不安定性; カオス過程; 分岐現象

To clarify chaotic process of electrostatic plasma waves we studied chaotic phenomena in an electron beam plasma system which was realized by applying dc potential between the driver plasma and target plasma using the Double plasma. Frequency spectrum of observed unstable waves was measured with the spectrum analyzer. Furthermore, the dispersion relation of test waves was obtained by measuring wave patterns by the interference method. Main results are as follows :(1) Injecting an electron beam into the target plasma excited unstable waves (130-200 MHz). These waves, which are the electron beam mode, were found to consist of standing waves.(2) The standing waves were excited between a potential well formed by the injection of the electron beam.(3) When the density was increased, bifurcation of 1/2,1/4, and 1/3 (subharmonics) was observed.(4) Estimating the correlation dimension from time series of the unstable waves, the present system was confirmed to be in a chaotic state.

为了阐明静电等离子体波的混沌过程，利用双等离子体在驱动等离子体和目标等离子体之间施加直流电势来实现电子束等离子体系统中的混沌现象。用频谱分析仪测量了观测到的不稳定波的频谱。此外，通过干涉法测量波形，得到了测试波的色散关系。主要结果如下：(1)向目标等离子体注入电子束，激发了130 ~ 200 MHz的不稳定波。这些波是电子束模式，被发现是由驻波组成的。驻波在电子束注入形成的势阱之间被激发。(3)当密度增大时，出现1/2、1/4和1/3次谐波分岔。(4)通过对不稳定波的时间序列进行相关维数估计，确定当前系统处于混沌状态。

项目成果

林 信哉: "電子ビーム・プラズマ系におけるテスト波の分散関係" 九州大学大学院総合理工学研究科報告. 16. 199-206 (1994)

Shinya Hayashi：“电子束等离子体系统中测试波的色散关系”九州大学研究生院理工学报告16。199-206（1994）。

N Hayashi: "Excitation mechanism of standing waves produced by electron beam plasma instability" Physics of Plasmas. 2. 3582-3587 (1995)

N Hayashi：“电子束等离子体不稳定性产生的驻波的激发机制”等离子体物理学。

N.Hayashi: "Excitation Mechanism of Standing Waves Produced by Electron Beam Plasma Instability" Physics of Plasmas. 2,10. 3582-3587 (1995)

N.Hayashi：“电子束等离子体不稳定性产生的驻波的激发机制”等离子体物理学。

N.Hayashi: "Observation of Bifurcation Phenomena in an Electron Beam Plasma System" Proc.of Int,on Phenomena in Ionized Gases. 3. 11-12 (1995)

N.Hayashi：“电子束等离子体系统中分叉现象的观察”Proc.of Int，关于电离气体中的现象。

N.Hayashi: "Observation of Bifurcation Phenomena in an Electron Beam Plasma System" Proc.of Int.Conf.on Phenomena in Ionized Gases. 3. 11-12 (1995)

N.Hayashi：“电子束等离子体系统中分岔现象的观察”Proc.of Int.Conf.on Phenomena in ionized Gases。