On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe

The region inside the nozzle (bore diameter ≈ 1 mm) of a cutting arc torch is inaccessible to most plasma diagnostics, and numerical simulations are the only means to find out the relative importance of several physical processes. In this work, a study of electrostatic (Langmuir) probes applied to t...

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Autores principales:	Prevosto, L., Mancinelli, B., Kelly, H.
Formato:	CONF
Materias:	Arc power Electric circuit Electron currents High energy densities Inverse slope Ion currents Ion sheath Langmuirs Non equilibrium Nozzle wall Numerical simulation Physical process Relative importance Solid bodies Two-temperature Cavity resonators Electron temperature Ions Langmuir probes Magnetrons Plasma density Plasma diagnostics Plasma jets Plasma sheaths Probes Simulators Nozzles
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_02811847_vT131_n_p_Prevosto
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_02811847_vT131_n_p_Prevosto
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spelling	todo:paper_02811847_vT131_n_p_Prevosto2023-10-03T15:17:12Z On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe Prevosto, L. Mancinelli, B. Kelly, H. Arc power Electric circuit Electron currents High energy densities Inverse slope Ion currents Ion sheath Langmuirs Non equilibrium Nozzle wall Numerical simulation Physical process Relative importance Solid bodies Two-temperature Cavity resonators Electron temperature Ions Langmuir probes Magnetrons Plasma density Plasma diagnostics Plasma jets Plasma sheaths Probes Simulators Nozzles The region inside the nozzle (bore diameter ≈ 1 mm) of a cutting arc torch is inaccessible to most plasma diagnostics, and numerical simulations are the only means to find out the relative importance of several physical processes. In this work, a study of electrostatic (Langmuir) probes applied to the inside of a high energy density 30 A cutting arc torch nozzle is presented. The metallic nozzle was used as a Langmuir probe, so the plasma flow is not perturbed by the probe as a solid body. Biasing the nozzle through an electric circuit that employs appropriate resistors together with the arc power source, the i-V nozzle characteristic was built. It was found that under a large positively biased nozzle, the electron current drained from the arc was relatively small, ≈ 1 A, notwithstanding the fact that the size of the nozzle was relatively large. On the other hand, an almost linear ion current was found for the ion branch for nozzle voltages well below the floating value. Based on the magnitude of inverse slope of the ion current, an estimation of the average electron temperature of the plasma in the vicinity of the nozzle wall was estimated from an ion sheath resistance model using a non-equilibrium two-temperature Saha-equation. An average electron temperature of about 4200 K and a corresponding plasma density of 4 × 10 17 m -3 were found. © 2008 The Royal Swedish Academy of Sciences. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02811847_vT131_n_p_Prevosto
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Arc power Electric circuit Electron currents High energy densities Inverse slope Ion currents Ion sheath Langmuirs Non equilibrium Nozzle wall Numerical simulation Physical process Relative importance Solid bodies Two-temperature Cavity resonators Electron temperature Ions Langmuir probes Magnetrons Plasma density Plasma diagnostics Plasma jets Plasma sheaths Probes Simulators Nozzles
spellingShingle	Arc power Electric circuit Electron currents High energy densities Inverse slope Ion currents Ion sheath Langmuirs Non equilibrium Nozzle wall Numerical simulation Physical process Relative importance Solid bodies Two-temperature Cavity resonators Electron temperature Ions Langmuir probes Magnetrons Plasma density Plasma diagnostics Plasma jets Plasma sheaths Probes Simulators Nozzles Prevosto, L. Mancinelli, B. Kelly, H. On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
topic_facet	Arc power Electric circuit Electron currents High energy densities Inverse slope Ion currents Ion sheath Langmuirs Non equilibrium Nozzle wall Numerical simulation Physical process Relative importance Solid bodies Two-temperature Cavity resonators Electron temperature Ions Langmuir probes Magnetrons Plasma density Plasma diagnostics Plasma jets Plasma sheaths Probes Simulators Nozzles
description	The region inside the nozzle (bore diameter ≈ 1 mm) of a cutting arc torch is inaccessible to most plasma diagnostics, and numerical simulations are the only means to find out the relative importance of several physical processes. In this work, a study of electrostatic (Langmuir) probes applied to the inside of a high energy density 30 A cutting arc torch nozzle is presented. The metallic nozzle was used as a Langmuir probe, so the plasma flow is not perturbed by the probe as a solid body. Biasing the nozzle through an electric circuit that employs appropriate resistors together with the arc power source, the i-V nozzle characteristic was built. It was found that under a large positively biased nozzle, the electron current drained from the arc was relatively small, ≈ 1 A, notwithstanding the fact that the size of the nozzle was relatively large. On the other hand, an almost linear ion current was found for the ion branch for nozzle voltages well below the floating value. Based on the magnitude of inverse slope of the ion current, an estimation of the average electron temperature of the plasma in the vicinity of the nozzle wall was estimated from an ion sheath resistance model using a non-equilibrium two-temperature Saha-equation. An average electron temperature of about 4200 K and a corresponding plasma density of 4 × 10 17 m -3 were found. © 2008 The Royal Swedish Academy of Sciences.
format	CONF
author	Prevosto, L. Mancinelli, B. Kelly, H.
author_facet	Prevosto, L. Mancinelli, B. Kelly, H.
author_sort	Prevosto, L.
title	On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
title_short	On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
title_full	On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
title_fullStr	On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
title_full_unstemmed	On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe
title_sort	on the use of the metallic nozzle of a cutting arc torch as a langmuir probe
url	http://hdl.handle.net/20.500.12110/paper_02811847_vT131_n_p_Prevosto
work_keys_str_mv	AT prevostol ontheuseofthemetallicnozzleofacuttingarctorchasalangmuirprobe AT mancinellib ontheuseofthemetallicnozzleofacuttingarctorchasalangmuirprobe AT kellyh ontheuseofthemetallicnozzleofacuttingarctorchasalangmuirprobe
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On the use of the metallic nozzle of a cutting arc torch as a Langmuir probe

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