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Title: Charge screening in a plasma with an external ionization source

Abstract

An asymptotic theory for the screening of the electric field of a dust particle or a spherical probe in a plasma with an external steady and/or internal (proportional to the electron density) gas ionization source has been developed for the first time. It has been established that the screening of the charge of a spherical body adsorbing the charge of the incident plasma particles is described by a superposition of two exponentials with different screening constants. The two exponentials are retained even in the absence of nonequilibrium fluxes on the macroparticle and only in the special case of an isothermal plasma does the screening become Debye one. The screening length is determined by the ratio of the electron-ion, {beta}{sub ei}, and Langevin, {beta}{sub L} = 4{pi}e{mu}{sub i} (where {mu}{sub i} is the ion mobility), recombination coefficients. If {beta}{sub L} >> {beta}{sub ei}, then it is much larger than the electron Debye length. The ions in an isothermal plasma have been found to give the same contribution to the screening as the electrons if the electron-ion recombination coefficient exceeds the Langevin ion recombination coefficient by a factor of 2 or more, {beta}{sub ei} {>=} 2{beta}{sub L}. The Vlasov equation is usedmore » to analyze the asymptotic behavior of the macroparticle potential in a collisionless plasma.« less

Authors:
 [1]; ;  [2]; ;  [3]
  1. Troitsk Institute for Innovation and Fusion Research, State Research Center of the Russian Federation (Russian Federation), E-mail: fav@triniti.ru
  2. National Academy of Sciences of Ukraine, Bogolyubov Institute for Theoretical Physics (Ukraine)
  3. Troitsk Institute for Innovation and Fusion Research, State Research Center of the Russian Federation (Russian Federation)
Publication Date:
OSTI Identifier:
21072544
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 104; Journal Issue: 1; Other Information: DOI: 10.1134/S1063776107010153; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMPTOTIC SOLUTIONS; BOLTZMANN-VLASOV EQUATION; COLLISIONLESS PLASMA; DEBYE LENGTH; DUSTS; ELECTRIC FIELDS; ELECTRON DENSITY; ELECTRON-ION COLLISIONS; ELECTRONS; ION MOBILITY; IONIZATION; IONS; PARTICLES; POTENTIALS; RECOMBINATION; SPHERICAL CONFIGURATION

Citation Formats

Filippov, A. V., Zagorodny, A. G., Momot, A. I., Pal, A. F., and Starostin, A. N. Charge screening in a plasma with an external ionization source. United States: N. p., 2007. Web. doi:10.1134/S1063776107010153.
Filippov, A. V., Zagorodny, A. G., Momot, A. I., Pal, A. F., & Starostin, A. N. Charge screening in a plasma with an external ionization source. United States. doi:10.1134/S1063776107010153.
Filippov, A. V., Zagorodny, A. G., Momot, A. I., Pal, A. F., and Starostin, A. N. Thu . "Charge screening in a plasma with an external ionization source". United States. doi:10.1134/S1063776107010153.
@article{osti_21072544,
title = {Charge screening in a plasma with an external ionization source},
author = {Filippov, A. V. and Zagorodny, A. G. and Momot, A. I. and Pal, A. F. and Starostin, A. N.},
abstractNote = {An asymptotic theory for the screening of the electric field of a dust particle or a spherical probe in a plasma with an external steady and/or internal (proportional to the electron density) gas ionization source has been developed for the first time. It has been established that the screening of the charge of a spherical body adsorbing the charge of the incident plasma particles is described by a superposition of two exponentials with different screening constants. The two exponentials are retained even in the absence of nonequilibrium fluxes on the macroparticle and only in the special case of an isothermal plasma does the screening become Debye one. The screening length is determined by the ratio of the electron-ion, {beta}{sub ei}, and Langevin, {beta}{sub L} = 4{pi}e{mu}{sub i} (where {mu}{sub i} is the ion mobility), recombination coefficients. If {beta}{sub L} >> {beta}{sub ei}, then it is much larger than the electron Debye length. The ions in an isothermal plasma have been found to give the same contribution to the screening as the electrons if the electron-ion recombination coefficient exceeds the Langevin ion recombination coefficient by a factor of 2 or more, {beta}{sub ei} {>=} 2{beta}{sub L}. The Vlasov equation is used to analyze the asymptotic behavior of the macroparticle potential in a collisionless plasma.},
doi = {10.1134/S1063776107010153},
journal = {Journal of Experimental and Theoretical Physics},
number = 1,
volume = 104,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}