Volume 85, Number 2, January 2009
|Number of page(s)||4|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||22 January 2009|
Mode conversion of large-amplitude electromagnetic waves in relativistic critical density plasmas
Institute of Theoretical Physics A, RWTH Aachen University - Templergraben 55, 52056 Aachen, Germany, EU
Accepted: 18 December 2008
The propagation of linearly polarized large-amplitude electromagnetic waves in critical density plasmas is studied in the framework of the Akiezer-Polovin model. A new mechanism of mode conversion is presented. The well-known periodic solutions are generalized to quasiperiodic solutions taking into account additional electrostatic oscillations. Nearly periodic circle-like solutions are found to be stabilized by intrinsic mode coupling whereas for nearly periodic eight-like solutions an effective mode conversion mechanism is discovered. Finally, the modulation timescales are considered.
PACS: 52.27.Ny – Relativistic plasmas / 52.38.-r – Laser-plasma interactions / 52.35.Mw – Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
© EPLA, 2009
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