Emissive Langmuir Probes in the Strong Emission Regime for the Determination of the Plasma Properties

Tierno Gomez, Sandra Pilar and Domenech-Garret, J.L and Donoso Vargas, Jose Manuel and Jennewein, Dominic and Herdrich, Georg and Fasoulas, S. and Conde López, Luis (2013). Emissive Langmuir Probes in the Strong Emission Regime for the Determination of the Plasma Properties. "IEEE Transactions on Plasma Science", v. 41 (n. 4); pp. 995-700. ISSN 0093-3813. https://doi.org/10.1109/TPS.2013.2243760.

Description

Title: Emissive Langmuir Probes in the Strong Emission Regime for the Determination of the Plasma Properties
Author/s:
  • Tierno Gomez, Sandra Pilar
  • Domenech-Garret, J.L
  • Donoso Vargas, Jose Manuel
  • Jennewein, Dominic
  • Herdrich, Georg
  • Fasoulas, S.
  • Conde López, Luis
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Plasma Science
Date: April 2013
ISSN: 0093-3813
Volume: 41
Subjects:
Freetext Keywords: Electron emission, plasma diagnostics, plasma probes, plasma properties
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

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (595kB) | Preview

Abstract

The determination of the plasma potential Vpl of unmagnetized plasmas by using the floating potential of emissive Langmuir probes operated in the strong emission regime is investigated. The experiments evidence that, for most cases, the electron thermionic emission is orders of magnitude larger than the plasma thermal electron current. The temperature-dependent floating potentials of negatively biased Vpmenor queVpl emissive probes are in agreement with the predictions of a simple phenomenological model that considers, in addition to the plasma electrons, an ad-ditional electron group that contributes to the probe current. The latter would be constituted by a fraction of the repelled electron thermionic current, which might return back to the probe with a different energy spectrum. Its origin would be a plasma potential well formed in the plasma sheath around the probe, acting as a virtual cathode or by collisions and electron thermalization pro-cesses. These results suggest that, for probe bias voltages close to the plasma potential Vp?Vpl, two electron populations coexist, i.e., the electrons from the plasma with temperatureTeand a large group of returned thermionic electrons. These results question the theoretical possibility of measuring the electron temperature by using emissive probes biased to potentials Vp about lower equal than ?Vpl.

More information

Item ID: 26432
DC Identifier: http://oa.upm.es/26432/
OAI Identifier: oai:oa.upm.es:26432
DOI: 10.1109/TPS.2013.2243760
Official URL: http://ieeexplore.ieee.org/xpl/abstractAuthors.jsp?reload=true&arnumber=6471245
Deposited by: Memoria Investigacion
Deposited on: 15 Apr 2015 16:39
Last Modified: 15 Apr 2015 16:39
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM