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Abstract:

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 ± 0.07 eV (= 11400 ± 800 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. © 2013 AIP Publishing LLC.

Registro:

Documento: Artículo
Título: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
Autor:Prevosto, L.; Kelly, H.; Mancinelli, B.
Filiación:Grupo de Descargas Eléctricas, Departamento Ing. Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto (2600), Santa Fe, Argentina
Instituto de Física Del Plasma (CONICET), Departamento de Física, Facultad de Ciencias Exactas y Naturales (UBA), (1428) Buenos Aires, Argentina
Palabras clave:Collision-free plasma; Electron currents; Exponential expression; Fluctuation analysis; Langmuir probe diagnostics; Langmuir probe measurements; Local thermal equilibrium; Plasma fluctuations; Ionization; Langmuir probes; Probes; Electron temperature
Año:2013
Volumen:84
Número:12
DOI: http://dx.doi.org/10.1063/1.4848916
Título revista:Review of Scientific Instruments
Título revista abreviado:Rev. Sci. Instrum.
ISSN:00346748
CODEN:RSINA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00346748_v84_n12_p_Prevosto

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Citas:

---------- APA ----------
Prevosto, L., Kelly, H. & Mancinelli, B. (2013) . 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. Review of Scientific Instruments, 84(12).
http://dx.doi.org/10.1063/1.4848916
---------- CHICAGO ----------
Prevosto, L., Kelly, H., Mancinelli, B. "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" . Review of Scientific Instruments 84, no. 12 (2013).
http://dx.doi.org/10.1063/1.4848916
---------- MLA ----------
Prevosto, L., Kelly, H., Mancinelli, B. "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" . Review of Scientific Instruments, vol. 84, no. 12, 2013.
http://dx.doi.org/10.1063/1.4848916
---------- VANCOUVER ----------
Prevosto, L., Kelly, H., Mancinelli, B. 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. Rev. Sci. Instrum. 2013;84(12).
http://dx.doi.org/10.1063/1.4848916