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Title: High Frequency Even Harmonics Generation in the Plasmas with Electron Fluxes

Abstract

The flux density time evolution of radiation at the even harmonics frequencies of a test wave is found and its link with the evolution of the current density produced by a constant electric field is established. Even harmonics generation is studied in two regimes: that of free accelerated motion which takes place for small time intervals and that of current saturation corresponding to the time moments much larger than the inverse of the electron-ion effective collision frequency when a quasi-stationary electron motion is established. The generation of even harmonics of pump wave in weakly non uniform plasma with electron heat flux is described as well.

Authors:
 [1];  [2]
  1. P.N.Lebedev Physics Institute, Leninsky pr.53, 119991, Moscow (Russian Federation)
  2. University of Palermo, Viale delle Scienze, Edificio 18, 90128, Palermo (Italy)
Publication Date:
OSTI Identifier:
20798470
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 827; Journal Issue: 1; Conference: 3. international conference on superstrong fields in plasmas, Varenna (Italy), 19-24 Sep 2005; Other Information: DOI: 10.1063/1.2195194; (c) 2006 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; CURRENT DENSITY; ELECTRIC CURRENTS; ELECTRIC FIELDS; ELECTRON COLLISIONS; ELECTRONS; FLUX DENSITY; HARMONIC GENERATION; HARMONICS; HEAT FLUX; IONS; LASER RADIATION; LASERS; PLASMA; PLASMA HEATING

Citation Formats

Uryupin, S. A., and Ferrante, G.. High Frequency Even Harmonics Generation in the Plasmas with Electron Fluxes. United States: N. p., 2006. Web. doi:10.1063/1.2195194.
Uryupin, S. A., & Ferrante, G.. High Frequency Even Harmonics Generation in the Plasmas with Electron Fluxes. United States. doi:10.1063/1.2195194.
Uryupin, S. A., and Ferrante, G.. Fri . "High Frequency Even Harmonics Generation in the Plasmas with Electron Fluxes". United States. doi:10.1063/1.2195194.
@article{osti_20798470,
title = {High Frequency Even Harmonics Generation in the Plasmas with Electron Fluxes},
author = {Uryupin, S. A. and Ferrante, G.},
abstractNote = {The flux density time evolution of radiation at the even harmonics frequencies of a test wave is found and its link with the evolution of the current density produced by a constant electric field is established. Even harmonics generation is studied in two regimes: that of free accelerated motion which takes place for small time intervals and that of current saturation corresponding to the time moments much larger than the inverse of the electron-ion effective collision frequency when a quasi-stationary electron motion is established. The generation of even harmonics of pump wave in weakly non uniform plasma with electron heat flux is described as well.},
doi = {10.1063/1.2195194},
journal = {AIP Conference Proceedings},
number = 1,
volume = 827,
place = {United States},
year = {Fri Apr 07 00:00:00 EDT 2006},
month = {Fri Apr 07 00:00:00 EDT 2006}
}
  • Generation of high frequency radiation harmonics in a current-carrying plasma is studied. The physical mechanism responsible for harmonics generation is provided by electron-ion collisions. The current in the plasma is sustained by a constant electric field. It is shown that the electron distribution function anisotropy due to the static field yields generation of even harmonics. As a result, the radiation spectrum emitted by the current-carrying plasma contains both even and odd harmonics, the latter being attributed to currentless plasma. For a broad range of plasma and high frequency radiation parameters, a detailed analysis of the even harmonics properties is reported.
  • A fully nonlinear one-dimensional problem describing the interactions of relativistically intense plane electromagnetic waves and cold locally non-neutral electron-positron plasmas is derived from Maxwell and fluid dynamics equations. Numerical and asymptotic solutions to this problem for phase velocities close to the speed of light are presented. Depending on the magnitude of the plasma longitudinal electric-field potential, the system considered is found to support two distinct regimes of plane electromagnetic wave propagation: a nonlinear self-modulation one with the coupling of a fast transversely polarized electromagnetic field to a slow longitudinal plasma field, and a harmonics generation one with both of thesemore » fields oscillating with comparable frequencies. In the former case, a splitting of the electromagnetic field spectrum into a series of closely located bands occurs, whereas in the latter one the propagating field spectrum is a set of radiation harmonics.« less