Ion-temperature-sensitive effect in transient langmuir probe response

Sanmartín Losada, Juan Ramón (1972). Ion-temperature-sensitive effect in transient langmuir probe response. "Physics of Fluids", v. 15 (n. 3); pp. 391-401. ISSN 0031-9171.

Description

Title: Ion-temperature-sensitive effect in transient langmuir probe response
Author/s:
  • Sanmartín Losada, Juan Ramón
Item Type: Article
Título de Revista/Publicación: Physics of Fluids
Date: 1972
Volume: 15
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

A theory is presented for a method, recently proposed by Hester and Sonin, of determining the ion temperature in a plasma by measuring the transient current to a cylindrical Langmuir probe after applying a potential Vp{ — eVpy>KTe) under conditions where collection is collision free and the ratio of probe radius to Debye length is small. The ion component of the current does not approach its final steady-state value monotonicalfy, but exhibits a strong, ion-temperature-dependent overshoot in the first few ion-plasma periods following the biasing of the probe. Analytical formulas are derived for the case of a Maxwellian plasma, and convenient graphical results are presented. The possible masking of the overshoot by a transient displacement current is discussed; it is shown how to avoid such displacement effects. For the overshoot to be sensitive to the ion temperature T the probe must be near plasma (zero) potential before applying V1,(eVp~<0.lKTe, VP~ being that initial potential); this is not a drawback of the method, but, on the contrary, it can be used to accurately determine plasma potential along with T.

More information

Item ID: 21311
DC Identifier: http://oa.upm.es/21311/
OAI Identifier: oai:oa.upm.es:21311
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 10 Oct 2013 12:33
Last Modified: 21 Apr 2016 11:29
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