Potential distribution around a test charge in a positive dust-electron plasma

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• 作者：S. Ali
• 关键词：dusty plasmas ; dust charge fluctuations ; positively charged dusty plasma ; shielding and dynamical potentials
• 刊名：Frontiers of Physics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：11
• 期：3
• 全文大小：323 KB
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• 作者单位：S. Ali (1)
  
  1. National Centre for Physics (NCP) at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad, 44000, Pakistan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470

文摘

The electrostatic potential caused by a test-charge particle in a positive dust-electron plasma is studied, accounting for the dust-charge fluctuations associated with ultraviolet photoelectron and thermionic emissions. For this purpose, the set of Vlasov–Poisson equations coupled with the dust charging equation is solved by using the space–time Fourier transform technique. As a consequence, a modified dielectric response function is obtained for dust-acoustic waves in a positive dust-electron plasma. By imposing certain conditions on the velocity of the test charge, the electrostatic potential is decomposed into the Debye–H¨uckel (DH), wake-field (WF), and far-field (FF) potentials that are significantly modified in the limit of a large dust-charge relaxation rate both analytically and numerically. The results can be helpful for understanding dust crystallization/coagulation in twocomponent plasmas, where positively charged dust grains are present.