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

Sanmartín Losada, Juan Ramón; Choinière, Eric; Gilchrist, Brian E.; Ferry, Jean-Benoit y 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.

Descripción

Título: Bare-tether sheath and current: comparison of asymptotic theory and kinetic simulations in stationary plasma
Autor/es:
  • Sanmartín Losada, Juan Ramón
  • Choinière, Eric
  • Gilchrist, Brian E.
  • Ferry, Jean-Benoit
  • Martínez-Sánchez, Manuel
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactionc on Plasma Science
Fecha: 2008
Volumen: 36
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 21760
Identificador DC: http://oa.upm.es/21760/
Identificador OAI: oai:oa.upm.es:21760
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 26 Nov 2013 15:33
Ultima Modificación: 21 Abr 2016 12:29
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