Properties of plasma jets emitted in pulsed capillary discharges at low pressures

The characteristic geometry of a pulsed capillary discharge (PCD), a narrow open end tube with a large aspect ratio, establishes natural conditions for the generation of plasma jets, that propagate in the neutral background gas surrounding the capillary. We have investigated the plasma jet emission...

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Autor principal: Grondona, Diana Elena
Publicado: 2006
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v875_n_p393_Avaria
http://hdl.handle.net/20.500.12110/paper_0094243X_v875_n_p393_Avaria
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_0094243X_v875_n_p393_Avaria2023-06-08T15:09:20Z Properties of plasma jets emitted in pulsed capillary discharges at low pressures Grondona, Diana Elena The characteristic geometry of a pulsed capillary discharge (PCD), a narrow open end tube with a large aspect ratio, establishes natural conditions for the generation of plasma jets, that propagate in the neutral background gas surrounding the capillary. We have investigated the plasma jet emission in a PCD, with electron beam assisted on-axis initiation. A local storage capacitor, coaxial with the capillary assembly, is pulse charged up to a maximum of -11 kV, which results in an initial ∼ 10 ns, ∼ 2 kA current pulse. The discharge is operated in Argon and Nitrogen, in a continuous pulsing mode, at frequencies between 5 to 20 Hz, and in a pressure range between 300 to 1100 Torr. A fast Langmuir probe, placed at the anode side, close to the capillary exit, is used to measure the characteristic electron temperature (Te) and electron density (Ne) of the plasma jets. Results obtained in Nitrogen at 10 Hz indicate that Te is in the 10 to 60 eV range with Ne of the order of 1014 (cm-3). Significant changes in the probe floating potential are observed for a fixed operating pressure when the pulsing frequency is varied, which can be ascribed to the presence of metastables in the gas fed into the capillary, which result from the interaction of the plasma jet with the plenum gas, at the cathode side. The presence of metastables reduces the energy cost involved in the capillary plasma production, which results in a pulsing frequency dependence of the plasma parameters. © 2006 American Institute of Physics. Fil:Grondona, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v875_n_p393_Avaria http://hdl.handle.net/20.500.12110/paper_0094243X_v875_n_p393_Avaria
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The characteristic geometry of a pulsed capillary discharge (PCD), a narrow open end tube with a large aspect ratio, establishes natural conditions for the generation of plasma jets, that propagate in the neutral background gas surrounding the capillary. We have investigated the plasma jet emission in a PCD, with electron beam assisted on-axis initiation. A local storage capacitor, coaxial with the capillary assembly, is pulse charged up to a maximum of -11 kV, which results in an initial ∼ 10 ns, ∼ 2 kA current pulse. The discharge is operated in Argon and Nitrogen, in a continuous pulsing mode, at frequencies between 5 to 20 Hz, and in a pressure range between 300 to 1100 Torr. A fast Langmuir probe, placed at the anode side, close to the capillary exit, is used to measure the characteristic electron temperature (Te) and electron density (Ne) of the plasma jets. Results obtained in Nitrogen at 10 Hz indicate that Te is in the 10 to 60 eV range with Ne of the order of 1014 (cm-3). Significant changes in the probe floating potential are observed for a fixed operating pressure when the pulsing frequency is varied, which can be ascribed to the presence of metastables in the gas fed into the capillary, which result from the interaction of the plasma jet with the plenum gas, at the cathode side. The presence of metastables reduces the energy cost involved in the capillary plasma production, which results in a pulsing frequency dependence of the plasma parameters. © 2006 American Institute of Physics.
author Grondona, Diana Elena
spellingShingle Grondona, Diana Elena
Properties of plasma jets emitted in pulsed capillary discharges at low pressures
author_facet Grondona, Diana Elena
author_sort Grondona, Diana Elena
title Properties of plasma jets emitted in pulsed capillary discharges at low pressures
title_short Properties of plasma jets emitted in pulsed capillary discharges at low pressures
title_full Properties of plasma jets emitted in pulsed capillary discharges at low pressures
title_fullStr Properties of plasma jets emitted in pulsed capillary discharges at low pressures
title_full_unstemmed Properties of plasma jets emitted in pulsed capillary discharges at low pressures
title_sort properties of plasma jets emitted in pulsed capillary discharges at low pressures
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v875_n_p393_Avaria
http://hdl.handle.net/20.500.12110/paper_0094243X_v875_n_p393_Avaria
work_keys_str_mv AT grondonadianaelena propertiesofplasmajetsemittedinpulsedcapillarydischargesatlowpressures
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