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Exact analytical calculation and numerical modelling by finite-difference time-domain method of the transient transmission of electromagnetic waves through cold plasmas

Published online by Cambridge University Press:  09 June 2020

Ivan V. Pavlenko Open the ORCID record for Ivan V. Pavlenko [Opens in a new window] ,
Igor O. Girka Open the ORCID record for Igor O. Girka [Opens in a new window] ,
Oleksandr V. Trush  and
Daria O. Melnyk
Ivan V. Pavlenko*
Affiliation:
Department of Physics and Technology, V.N.Karazin Kharkiv National University, Svobody Sq.4, 61022, Kharkiv, Ukraine
Igor O. Girka
Affiliation:
Department of Physics and Technology, V.N.Karazin Kharkiv National University, Svobody Sq.4, 61022, Kharkiv, Ukraine
Oleksandr V. Trush
Affiliation:
Department of Physics and Technology, V.N.Karazin Kharkiv National University, Svobody Sq.4, 61022, Kharkiv, Ukraine
Daria O. Melnyk
Affiliation:
Department of Physics and Technology, V.N.Karazin Kharkiv National University, Svobody Sq.4, 61022, Kharkiv, Ukraine
*
†Email address for correspondence: [email protected]
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Abstract

The transient transmission of an electromagnetic wave through cold, unmagnetized and collisionless plasmas is described both analytically and numerically for its normal incidence from vacuum upon a plasma half-space. Exact formulas for the electromagnetic field are written in integral forms, which are convenient for approximate analysis and comparison with the results of direct numerical simulations. The time when the plasma particle oscillations become self-consistent with the electromagnetic field can be calculated from the simplified formulas for an arbitrary distance from the plasma–vacuum interface. Special attention is paid to the formation of the electrostatic oscillation in the case when the frequency of the incident wave is equal to the plasma frequency. The amplitudes of the vanishing magnetic field and the forming electrostatic oscillation are calculated as functions of time and the distance from the plasma–vacuum interface. The formation of the electrostatic oscillation is a slow process because the electromagnetic power penetrating into the plasma tends to zero with time. The transmitted plasma electromagnetic field is also simulated by the a finite-difference time-domain (FDTD) code. The difficulties of the numerical simulation of the quasi-electrostatic field are discussed. The analytical results can be used for the validation of the FDTD codes for plasma waves.

Keywords

plasma simulationplasma waves
Type
Research Article
Information
Journal of Plasma Physics , Volume 86 , Issue 3 , June 2020 , 905860310
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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