Parametric decays in relativistic magnetized electronpositron plasmas with relativistic temperatures
Abstract
The nonlinear evolution of a circularly polarized electromagnetic wave in an electronpositron plasma propagating along a constant background magnetic field is considered, by studying its parametric decays. Relativistic effects, of the particle motion in the wave field and of the plasma temperature, are included to obtain the dispersion relation of the decays. The exact dispersion relation of the pump wave has been previously calculated within the context of a relativistic fluid theory and presents two branches: an electromagnetic and an Alfven one. We investigate the parametric decays for the pump wave in these two branches, including the anomalous dispersion zone of the Alfven branch where the group velocity is negative. We solve the nonlinear dispersion relation for different pump wave amplitudes and plasma temperatures, finding various resonant and nonresonant wave couplings. We are able to identify these couplings and study their behavior as we modify the plasma parameters. Some of these couplings are suppressed for larger amplitudes or temperatures. We also find two kinds of modulational instabilities, one involving two sideband daughter waves and another involving a forwardpropagating electroacoustic mode and a sideband daughter wave.
 Authors:
 Departamento de Fisica, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago (Chile)
 Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712 (United States)
 (Chile)
 Publication Date:
 OSTI Identifier:
 22085995
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Plasmas; Journal Volume: 19; Journal Issue: 8; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; DISPERSION RELATIONS; ELECTROMAGNETIC RADIATION; ELECTRON TEMPERATURE; ELECTRONPOSITRON INTERACTIONS; FLUID MECHANICS; INSTABILITY; ION TEMPERATURE; MAGNETIC FIELDS; NONLINEAR PROBLEMS; RELATIVISTIC PLASMA; RELATIVISTIC RANGE
Citation Formats
Lopez, Rodrigo A., Munoz, Victor, Asenjo, Felipe A., Alejandro Valdivia, J., and Centro para el Desarrollo de la Nanociencia y la Nanotecnologia, CEDENNA, Santiago. Parametric decays in relativistic magnetized electronpositron plasmas with relativistic temperatures. United States: N. p., 2012.
Web. doi:10.1063/1.4742315.
Lopez, Rodrigo A., Munoz, Victor, Asenjo, Felipe A., Alejandro Valdivia, J., & Centro para el Desarrollo de la Nanociencia y la Nanotecnologia, CEDENNA, Santiago. Parametric decays in relativistic magnetized electronpositron plasmas with relativistic temperatures. United States. doi:10.1063/1.4742315.
Lopez, Rodrigo A., Munoz, Victor, Asenjo, Felipe A., Alejandro Valdivia, J., and Centro para el Desarrollo de la Nanociencia y la Nanotecnologia, CEDENNA, Santiago. Wed .
"Parametric decays in relativistic magnetized electronpositron plasmas with relativistic temperatures". United States.
doi:10.1063/1.4742315.
@article{osti_22085995,
title = {Parametric decays in relativistic magnetized electronpositron plasmas with relativistic temperatures},
author = {Lopez, Rodrigo A. and Munoz, Victor and Asenjo, Felipe A. and Alejandro Valdivia, J. and Centro para el Desarrollo de la Nanociencia y la Nanotecnologia, CEDENNA, Santiago},
abstractNote = {The nonlinear evolution of a circularly polarized electromagnetic wave in an electronpositron plasma propagating along a constant background magnetic field is considered, by studying its parametric decays. Relativistic effects, of the particle motion in the wave field and of the plasma temperature, are included to obtain the dispersion relation of the decays. The exact dispersion relation of the pump wave has been previously calculated within the context of a relativistic fluid theory and presents two branches: an electromagnetic and an Alfven one. We investigate the parametric decays for the pump wave in these two branches, including the anomalous dispersion zone of the Alfven branch where the group velocity is negative. We solve the nonlinear dispersion relation for different pump wave amplitudes and plasma temperatures, finding various resonant and nonresonant wave couplings. We are able to identify these couplings and study their behavior as we modify the plasma parameters. Some of these couplings are suppressed for larger amplitudes or temperatures. We also find two kinds of modulational instabilities, one involving two sideband daughter waves and another involving a forwardpropagating electroacoustic mode and a sideband daughter wave.},
doi = {10.1063/1.4742315},
journal = {Physics of Plasmas},
number = 8,
volume = 19,
place = {United States},
year = {Wed Aug 15 00:00:00 EDT 2012},
month = {Wed Aug 15 00:00:00 EDT 2012}
}

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