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Title: Nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency

Abstract

It is shown that the nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency change substantially due to a reduction in the effective electron–ion collision frequency.

Authors:
;  [1]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22614086
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 42; Journal Issue: 9; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CURRENTS; ELECTRON-ION COLLISIONS; ELECTRONS; LANGMUIR FREQUENCY; NONLINEAR PROBLEMS; PLASMA; PULSES

Citation Formats

Grishkov, V. E., and Uryupin, S. A., E-mail: uryupin@sci.lebedev.ru. Nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency. United States: N. p., 2016. Web. doi:10.1134/S1063780X16090038.
Grishkov, V. E., & Uryupin, S. A., E-mail: uryupin@sci.lebedev.ru. Nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency. United States. doi:10.1134/S1063780X16090038.
Grishkov, V. E., and Uryupin, S. A., E-mail: uryupin@sci.lebedev.ru. 2016. "Nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency". United States. doi:10.1134/S1063780X16090038.
@article{osti_22614086,
title = {Nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency},
author = {Grishkov, V. E. and Uryupin, S. A., E-mail: uryupin@sci.lebedev.ru},
abstractNote = {It is shown that the nonlinear currents generated in plasma by a radiation pulse with a frequency exceeding the electron plasma frequency change substantially due to a reduction in the effective electron–ion collision frequency.},
doi = {10.1134/S1063780X16090038},
journal = {Plasma Physics Reports},
number = 9,
volume = 42,
place = {United States},
year = 2016,
month = 9
}
  • A kinetic theory of low-frequency currents induced in plasma by an ultrashort high-frequency radiation pulse is developed. General expressions for the currents flowing along the propagation direction of the pulse and along the gradient of the field energy density are analyzed both analytically and numerically for pulse durations longer or shorter than or comparable with the electron collision time in plasma. It is demonstrated that the nonlinear current flowing along the gradient of the field energy density can be described correctly only when the modification of the isotropic part of the electron distribution function is taken into account.
  • Excitation of plasma waves by nonlinear currents induced by a high-frequency electromagnetic pulse is analyzed within the kinetic approach. It is shown that the most efficient source of plasma waves is the nonlinear current arising due to the gradient of the energy density of the high-frequency field. Generation of plasma waves by the drag current is usually less efficient but not negligibly small at relatively high frequencies of electron–ion collisions. The influence of electron collisions on the excitation of plasma waves by pulses of different duration is described quantitatively.
  • Nonlinear currents slowly varying in time are found in the skin layer of a metal irradiated by short laser pulses. The low-frequency field generated by the nonlinear currents in metal and vacuum is studied. The spectral composition, energy and shape of the low-frequency radiation pulse are described. (nonlinear optical phenomena)
  • Numerical simulation of the interaction of a laser pulse propagating along the external magnetic field shows that, along with the electrostatic upper hybrid wave, a laser pulse can parametrically excite a broad spectrum of whistler waves with frequencies below the electron cyclotron frequency. Electron heating predominantly in the direction perpendicular to laser pulse propagation was observed in simulations. In this paper the possible mechanism of transverse electron heating associated with the turbulence of whistler waves parametrically excited by a laser pulse has been investigated.