The orbital-motion-limited regime of cylindrical Langmuir probes

Sanmartín Losada, Juan Ramón and Estes, Robert D. (1999). The orbital-motion-limited regime of cylindrical Langmuir probes. "Physics of Plasmas", v. 6 (n. 1); pp. 395-405. ISSN 1070-664X.

Description

Title: The orbital-motion-limited regime of cylindrical Langmuir probes
Author/s:
  • Sanmartín Losada, Juan Ramón
  • Estes, Robert D.
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: 1999
Volume: 6
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

An asymptotic analysis of electron collection at high bias Fp serves to determine the domain of validity of the orbital-motion-limited regime of cylindrical Langmuir probes, which is basic for the workings of conductive bare tethers. The radius of a wire collecting OML current in an unmagnetized plasma at rest cannot exceed a value, Rmax , which is found to exhibit a minimum as a function of Fp ; atFp values of interest, Rmax is already increasing and is larger than the electron Debye length lDe . The breakdown of the regime relates to conditions far fromthe probe, at electron energies comparable to the ion thermal energy, kTi ; Rmax is found to increase with Ti . It is also found that ~1! the maximumwidth of a thin tape, if used instead of a wire, is 4Rmax ; ~2! the electron thermal gyroradius must be larger than both R and lDe for magnetic effects to be negligible; and ~3! conditions applying to the tether case are such that trapped-orbit effects are negligible.

More information

Item ID: 21647
DC Identifier: http://oa.upm.es/21647/
OAI Identifier: oai:oa.upm.es:21647
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 19 Nov 2013 13:51
Last Modified: 21 Apr 2016 12:21
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