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题名: A Particle-in-Cell Simulation Study on Harmonic Waves Excited by Electron Beams in Unmagnetized Plasmas
作者: Guo, Jun
作者部门: 空间科学部
通讯作者: Guo, J (reprint author), Qingdao Univ Sci & Technol, Coll Math & Phys, Qingdao 266061, Peoples R China. ; Guo, J (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China.
刊名: CHINESE PHYSICS LETTERS
ISSN号: 0256-307X
出版日期: 2016
卷号: 33, 期号:8, 页码:85202
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41204115] ; Specialized Research Fund for State Key Laboratories
英文摘要: The excitation of harmonic waves by an electron beam is studied with electrostatic simulations. The results suggest that the harmonic waves are excited during the linear stage of the simulation and are developed in the nonlinear stage. First, the Langmuir waves (LWs) are excited by the beam electrons. Then the coupling of the forward propagating LWs and beam modes will excite the second harmonic waves. The third harmonic waves will be produced if the lower velocity side of the beam still has a positive velocity gradient. The beam velocity decreases at the same time, which provides the energy for wave excitation. We find that it is difficult to excite the harmonic waves with the increase of the thermal velocity of the beam electrons. The beam electrons will be heated after waves are excited, and then the part of the forward propagating LWs will turn into electron acoustic waves under the condition with a large enough intensity of beam electrons. Moreover, the action of ions hardly affects the formation of harmonic waves.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5626
Appears in Collections:空间科学部_期刊论文

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文件名: 20163385202.pdf
格式: Adobe PDF
文件名: 20163385202.pdf
格式: Adobe PDF
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