Volume 83, Number 1, July 2008
|Number of page(s)||3|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||16 June 2008|
Viscous limitation of large-amplitude pulses in two-component plasmas
Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick Coventry CV4 7AL, UK, EU
2 Department of Theoretical Physics, Soltan Institute for Nuclear Studies - Hoża 69, 00-681 Warsaw, Poland, EU
Accepted: 20 May 2008
Some time ago, we found an exact solution for nonlinear cold-plasma oscillations against a periodic ion background. The main and somewhat surprising physical effect due to the fixed ion background was the appearance of unbounded-electron density and electric-field intensity peaks. Along with others, we then tried to understand this in terms of realistic physical situations. Here we present a calculation indicating that these infinities can be removed by inclusion of viscous effects. A discussion of possible regions of validity of the model is given. For removal of infinities, the viscosity must be larger than a critical value depending on both the amplitude and spacing of the periodic ion background. Lagrangian coordinates are crucial in this calculation.
PACS: 51.20.+d – Viscosity, difusion, and thermal conductivity / 52.30.-q – Plasma dynamics and flow / 47.20.Ky – Nonlinearity, bifurcation, and symmetry breaking
© EPLA, 2008
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