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Artículo

Langmuir probe measurements in a time-fluctuating-highly ionized non-equilibrium cutting arc: analysis of the electron retarding part of the time-averaged current-voltage characteristic of the probe

Prevosto, LeandroIcon ; Kelly, Hector JuanIcon ; Mancinelli, Beatriz Rosa
Fecha de publicación: 12/2013
Editorial: American Institute of Physics
Revista: Review of Scientific Instruments
ISSN: 0034-6748
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Física de los Fluidos y Plasma

Resumen

This work describes the application of Langmuir probe diagnostics to the measurement of the electron temperature in a time-fluctuating-highly ionized, non-equilibrium cutting arc. The electron retarding part of the time-averaged current-voltage characteristic of the probe was analysed, assuming that the standard exponential expression describing the electron current to the probe in collision-free plasmas can be applied under the investigated conditions. A procedure is described which allows the determination of the errors introduced in time-averaged probe data due to small-amplitude plasma fluctuations. It was found that the experimental points can be gathered into two well defined groups allowing defining two quite different averaged electron temperature values. In the low-current region the averaged characteristic was not significantly disturbed by the fluctuations and can reliably be used to obtain the actual value of the averaged electron temperature. In particular, an averaged electron temperature of 0.98 eV (= 11400 K) was found for the central core of the arc (30 A) at 3.5 mm downstream from the nozzle exit. This average included not only a time-average over the time fluctuations, but also a spatial-average along the probe collecting length. The fitting of the high-current region of the characteristic using such electron temperature value together with the corrections given by the fluctuation analysis showed a relevant departure of local thermal equilibrium in the arc core.
Palabras clave: LANGMUIR PROBES , PLASMA TORCHES
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/101795
DOI: http://dx.doi.org/10.1063/1.4848916
URL: https://aip.scitation.org/doi/10.1063/1.4848916
Colecciones
Articulos(INFIP) [183]
Articulos de INST.DE FISICA DEL PLASMA
Articulos(CCT - SANTA FE) [2716]
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SANTA FE
Citación
Prevosto, Leandro; Kelly, Hector Juan; Mancinelli, Beatriz Rosa; Langmuir probe measurements in a time-fluctuating-highly ionized non-equilibrium cutting arc: analysis of the electron retarding part of the time-averaged current-voltage characteristic of the probe; American Institute of Physics; Review of Scientific Instruments; 84; 12-2013; 3506-3511
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