Study of a contracted glow in low-frequency plasma-jet discharges operating with argon

In this work, we present an experimental and theoretical study of a low frequency, atmospheric plasma-jet discharge in argon. The discharge has the characteristics of a contracted glow with a current channel of submillimeter diameter and a relatively high voltage cathode layer. In order to interpret...

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Autores principales: Minotti, F., Giuliani, L., Xaubet, M., Grondona, D.
Formato: JOUR
Materias:
Cathodes
Collisional plasmas
Electric discharges
Electrodes
Electrons
Field emission displays
Fighter aircraft
Heat conduction
Ion bombardment
Plasma jets
Secondary emission
Thermionic emission
Atmospheric plasmas
Comparison of models
High voltage cathode
Low-frequency plasmas
Metastable levels
Secondary electrons
Submillimeter diameter
Thermal equilibriums
Electron emission
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1070664X_v22_n11_p_Minotti
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1070664X_v22_n11_p_Minotti2023-10-03T16:02:34Z Study of a contracted glow in low-frequency plasma-jet discharges operating with argon Minotti, F. Giuliani, L. Xaubet, M. Grondona, D. Cathodes Collisional plasmas Electric discharges Electrodes Electrons Field emission displays Fighter aircraft Heat conduction Ion bombardment Plasma jets Secondary emission Thermionic emission Atmospheric plasmas Comparison of models High voltage cathode Low-frequency plasmas Metastable levels Secondary electrons Submillimeter diameter Thermal equilibriums Electron emission In this work, we present an experimental and theoretical study of a low frequency, atmospheric plasma-jet discharge in argon. The discharge has the characteristics of a contracted glow with a current channel of submillimeter diameter and a relatively high voltage cathode layer. In order to interpret the measurements, we consider the separate modeling of each region of the discharge: main channel and cathode layer, which must then be properly matched together. The main current channel was modeled, extending a previous work, as similar to an arc in which joule heating is balanced by lateral heat conduction, without thermal equilibrium between electrons and heavy species. The cathode layer model, on the other hand, includes the emission of secondary electrons by ion impact and by additional mechanisms, of which we considered emission due to collision of atoms excited at metastable levels, and field-enhanced thermionic emission (Schottky effect). The comparison of model and experiment indicates that the discharge can be effectively sustained in its contracted form by the secondary electrons emitted by collision of excited argon atoms, whereas thermionic emission is by far insufficient to provide the necessary electrons. © 2015 AIP Publishing LLC. Fil:Minotti, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Grondona, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1070664X_v22_n11_p_Minotti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cathodes
Collisional plasmas
Electric discharges
Electrodes
Electrons
Field emission displays
Fighter aircraft
Heat conduction
Ion bombardment
Plasma jets
Secondary emission
Thermionic emission
Atmospheric plasmas
Comparison of models
High voltage cathode
Low-frequency plasmas
Metastable levels
Secondary electrons
Submillimeter diameter
Thermal equilibriums
Electron emission
spellingShingle Cathodes
Collisional plasmas
Electric discharges
Electrodes
Electrons
Field emission displays
Fighter aircraft
Heat conduction
Ion bombardment
Plasma jets
Secondary emission
Thermionic emission
Atmospheric plasmas
Comparison of models
High voltage cathode
Low-frequency plasmas
Metastable levels
Secondary electrons
Submillimeter diameter
Thermal equilibriums
Electron emission
Minotti, F.
Giuliani, L.
Xaubet, M.
Grondona, D.
Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
topic_facet Cathodes
Collisional plasmas
Electric discharges
Electrodes
Electrons
Field emission displays
Fighter aircraft
Heat conduction
Ion bombardment
Plasma jets
Secondary emission
Thermionic emission
Atmospheric plasmas
Comparison of models
High voltage cathode
Low-frequency plasmas
Metastable levels
Secondary electrons
Submillimeter diameter
Thermal equilibriums
Electron emission
description In this work, we present an experimental and theoretical study of a low frequency, atmospheric plasma-jet discharge in argon. The discharge has the characteristics of a contracted glow with a current channel of submillimeter diameter and a relatively high voltage cathode layer. In order to interpret the measurements, we consider the separate modeling of each region of the discharge: main channel and cathode layer, which must then be properly matched together. The main current channel was modeled, extending a previous work, as similar to an arc in which joule heating is balanced by lateral heat conduction, without thermal equilibrium between electrons and heavy species. The cathode layer model, on the other hand, includes the emission of secondary electrons by ion impact and by additional mechanisms, of which we considered emission due to collision of atoms excited at metastable levels, and field-enhanced thermionic emission (Schottky effect). The comparison of model and experiment indicates that the discharge can be effectively sustained in its contracted form by the secondary electrons emitted by collision of excited argon atoms, whereas thermionic emission is by far insufficient to provide the necessary electrons. © 2015 AIP Publishing LLC.
format JOUR
author Minotti, F.
Giuliani, L.
Xaubet, M.
Grondona, D.
author_facet Minotti, F.
Giuliani, L.
Xaubet, M.
Grondona, D.
author_sort Minotti, F.
title Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
title_short Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
title_full Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
title_fullStr Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
title_full_unstemmed Study of a contracted glow in low-frequency plasma-jet discharges operating with argon
title_sort study of a contracted glow in low-frequency plasma-jet discharges operating with argon
url http://hdl.handle.net/20.500.12110/paper_1070664X_v22_n11_p_Minotti
work_keys_str_mv AT minottif studyofacontractedglowinlowfrequencyplasmajetdischargesoperatingwithargon
AT giulianil studyofacontractedglowinlowfrequencyplasmajetdischargesoperatingwithargon
AT xaubetm studyofacontractedglowinlowfrequencyplasmajetdischargesoperatingwithargon
AT grondonad studyofacontractedglowinlowfrequencyplasmajetdischargesoperatingwithargon
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