Bare-tether sheath and current: comparison of asymptotic theory and kinetic simulations in stationary plasma

Sanmartín Losada, Juan Ramón and Choinière, Eric and Gilchrist, Brian E. and Ferry, Jean-Benoit and Martínez-Sánchez, Manuel (2008). Bare-tether sheath and current: comparison of asymptotic theory and kinetic simulations in stationary plasma. "IEEE Transactionc on Plasma Science", v. 36 (n. 5); pp. 2851-2858. ISSN 0093-3813.

Description

Title: Bare-tether sheath and current: comparison of asymptotic theory and kinetic simulations in stationary plasma
Author/s:
  • Sanmartín Losada, Juan Ramón
  • Choinière, Eric
  • Gilchrist, Brian E.
  • Ferry, Jean-Benoit
  • Martínez-Sánchez, Manuel
Item Type: Article
Título de Revista/Publicación: IEEE Transactionc on Plasma Science
Date: 2008
ISSN: 0093-3813
Volume: 36
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Analytical expressions for current to a cylindrical Langmuir probe at rest in unmagnetized plasma are compared with results from both steady-state Vlasov and particle-in-cell simulations. Probe bias potentials that are much greater than plasma temperature (assumed equal for ions and electrons), as of interest for bare conductive tethers, are considered. At a very high bias, both the electric potential and the attracted-species density exhibit complex radial profiles; in particular, the density exhibits a minimum well within the plasma sheath and a maximum closer to the probe. Excellent agreement is found between analytical and numerical results for values of the probe radiusR close to the maximum radius Rmax for orbital-motion-limited (OML) collection at a particular bias in the following number of profile features: the values and positions of density minimum and maximum, position of sheath boundary, and value of a radius characterizing the no-space-charge behavior of a potential near the high-bias probe. Good agreement between the theory and simulations is also found for parametric laws jointly covering the following three characteristic R ranges: sheath radius versus probe radius and bias for Rmax; density minimum versus probe bias for Rmax; and (weakly bias-dependent) current drop below the OML value versus the probe radius for R > Rmax.

More information

Item ID: 21760
DC Identifier: http://oa.upm.es/21760/
OAI Identifier: oai:oa.upm.es:21760
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 26 Nov 2013 15:33
Last Modified: 21 Apr 2016 12:29
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