Relativistic current collection by a cylindrical Langmuir probe

Sánchez Arriaga, Gonzalo and Sanmartín Losada, Juan Ramón (2012). Relativistic current collection by a cylindrical Langmuir probe. "Physics of Plasmas", v. 19 (n. 6); p. 63506. ISSN 1070-664X. https://doi.org/10.1063/1.4729662.

Description

Title: Relativistic current collection by a cylindrical Langmuir probe
Author/s:
  • Sánchez Arriaga, Gonzalo
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: 19 June 2012
Volume: 19
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

The current I to a cylindrical Langmuir probe with a bias Φp satisfying β≡eΦp/mec2∼O(1) is discussed. The probe is considered at rest in an unmagnetized plasma composed of electrons and ions with temperatureskTe∼kTi≪mec2. For small enough radius, the probe collects the relativistic orbital-motion-limited (OML) current I OML , which is shown to be larger than the non-relativistic result; the OML current is proportional to β1/2 and β3/2 in the limits β≪1 and β≫1, respectively. Unlike the non-relativistic case, the electron density can exceed the unperturbed density value. An asymptotic theory allowed to compute the maximum radius of the probe to collect OML current, the sheath radius for probe radius well below maximum and how the ratio I/I OML drops below unity when the maximum radius is exceeded. A numerical algorithm that solves the Vlasov-Poisson system was implemented and density and potential profiles presented. The results and their implications in a possible mission to Jupiter with electrodynamic bare tethers are discussed density value. An asymptotic theory allowed to compute the maximum radius of the probe to collect OML current, the sheath radius for probe radius well below maximum and how the ratio I/IOML drops below unity when the maximum radius is exceeded. A numerical algorithm that solves the Vlasov-Poisson system was implemented and density and potential profiles presented. The results and their implications in a possible mission to Jupiter with electrodynamic bare tethers are discussed.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7262972BETSUnspecifiedPropellantless deorbiting of space debris by bare electrodynamic tethers

More information

Item ID: 15556
DC Identifier: http://oa.upm.es/15556/
OAI Identifier: oai:oa.upm.es:15556
DOI: 10.1063/1.4729662
Official URL: http://scitation.aip.org/content/aip/journal/pop/19/6/10.1063/1.4729662
Deposited by: Memoria Investigacion
Deposited on: 08 Apr 2014 18:11
Last Modified: 01 Dec 2016 08:25
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