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论文类型：期刊论文

发表时间：2011-11-01

发表刊物：PHYSICS OF PLASMAS

收录刊物：Scopus、SCIE、EI

卷号：18

期号：11

ISSN号：1070-664X

关键字：nonlinear differential equations; numerical analysis; plasma collision processes; plasma nonlinear processes; plasma oscillations; plasma transport processes

摘要：We examine the interaction of particles with a one-dimensional electron gas by employing the quantum hydrodynamic (QHD) theory, where the nonlinear wake potential and stopping power have been numerically calculated by solving the nonlinear QHD equations with flux corrected transport (FCT) numerical method. In our calculation, the nonlinear effects on the wake potential and stopping power are clearly observed and presented. In the moving coordinate, comparisons are made between the nonlinear and linear wake potentials, in which the maximum values are larger and more oscillations appear behind the projectile in a nonlinear case in contrast to that in a linear case. The nonlinear wake potentials show a clear dependence on time, that is, the FCT algorithm solves the nonlinear QHD equations by time integration starting from the initial time. It is shown that the nonlinear effects can enhance the wake potential and stopping power for particle velocities greater than a few Bohr velocities. (C) 2011 American Institute of Physics. [doi:10.1063/1.3659026]