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

Tierno Gomez, Sandra Pilar; Domenech-Garret, J.L; Donoso Vargas, Jose Manuel; Jennewein, Dominic; Herdrich, Georg; Fasoulas, S. y 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.

Descripción

Título: Emissive Langmuir Probes in the Strong Emission Regime for the Determination of the Plasma Properties
Autor/es:
  • Tierno Gomez, Sandra Pilar
  • Domenech-Garret, J.L
  • Donoso Vargas, Jose Manuel
  • Jennewein, Dominic
  • Herdrich, Georg
  • Fasoulas, S.
  • Conde López, Luis
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on Plasma Science
Fecha: Abril 2013
Volumen: 41
Materias:
Palabras Clave Informales: Electron emission, plasma diagnostics, plasma probes, plasma properties
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

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.

Más información

ID de Registro: 26432
Identificador DC: http://oa.upm.es/26432/
Identificador OAI: oai:oa.upm.es:26432
Identificador DOI: 10.1109/TPS.2013.2243760
URL Oficial: http://ieeexplore.ieee.org/xpl/abstractAuthors.jsp?reload=true&arnumber=6471245
Depositado por: Memoria Investigacion
Depositado el: 15 Abr 2015 16:39
Ultima Modificación: 15 Abr 2015 16:39
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