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Double layers and ion-acoustic waves: a fully particle-in-cell simulation
GUO Jun 1,LI Bo 2 * #
1.School of Mathematics and Physics, Qingdao University of Science and Technology, ShanDong Qingdao 266061
2.School of Space science and Physics,Shandong University at Weihai,Weihai, 264209
*Correspondence author
#Submitted by
Subject:
Funding: Research Fund for the Doctoral Program of Higher Education of China（No.No.20110131110058）, National Natural Science Foundation of China （No.Nos. 40974097, 41204115 ）
Opened online: 5 March 2013
Accepted by: none
Citation: GUO Jun,LI Bo.Double layers and ion-acoustic waves: a fully particle-in-cell simulation[OL]. [ 5 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4522566
 
 
Double layers and ion-acoustic waves are investigated by using a one-dimensional electrostatic particle-in-cell simulation code. Our results show that double layers can be formed even when the drift velocity between electrons and ions is less than the electron thermal velocity. The electron and ion density depressions are clearly seen. Electrons gradually develop a distribution comprising both background and beam components. In fact, as the initial electron-ion drift velocity is less than the electron thermal velocity, intense ion-acoustic waves can be found only where the electron beam is located, suggesting that they are excited by the self-consistently developed electron beam. Besides the Langmuir waves and ion-acoustic waves, the beam mode excited by electron beam produced in our simulation has been found clearly.
Keywords:electron-ion streaming instability; Langmuir instability; particle-in-cell
 
 
 

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