Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter

A model is developed to describe the plasma jet generated in a vacuum arc, which enters and flows inside a straight magnetic filter with a realistic magnetic field configuration. Considering a low-density collisionless plasma projection of the electron momentum equation along the magnetic field line...

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Autores principales:	Minotti, F., Giuliani, L., Grondona, D., Della Torre, H., Kelly, H.
Formato:	JOUR
Materias:	Anomalous transport magnetic field vacuum arc Annular anodes Anomalous diffusion Different-magnetic fields Electron momentum equations Electrostatic potentials Experimental measurements Floating potentials Friction effect Ion mass Ion momentum Ion motions Ion saturation current Magnetic field configurations Magnetic field line Magnetic focusing Magnetic lines Model results Probe measurements Radial oscillation Radial position System of equations Vacuum arcs Collisionless plasmas Diffusion Friction Ions Magnetic fields Magnetic filters Magnetic separators Plasma accelerators Plasma density Plasma diagnostics Plasma jets Vacuum Vacuum applications Vacuum technology Magnetoplasma
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00933813_v39_n10_p2014_Minotti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00933813_v39_n10_p2014_Minotti
record_format	dspace
spelling	todo:paper_00933813_v39_n10_p2014_Minotti2023-10-03T14:55:34Z Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter Minotti, F. Giuliani, L. Grondona, D. Della Torre, H. Kelly, H. Anomalous transport magnetic field vacuum arc Annular anodes Anomalous diffusion Anomalous transport Different-magnetic fields Electron momentum equations Electrostatic potentials Experimental measurements Floating potentials Friction effect Ion mass Ion momentum Ion motions Ion saturation current Magnetic field configurations Magnetic field line Magnetic focusing Magnetic lines Model results Probe measurements Radial oscillation Radial position System of equations vacuum arc Vacuum arcs Collisionless plasmas Diffusion Friction Ions Magnetic fields Magnetic filters Magnetic separators Plasma accelerators Plasma density Plasma diagnostics Plasma jets Vacuum Vacuum applications Vacuum technology Magnetoplasma A model is developed to describe the plasma jet generated in a vacuum arc, which enters and flows inside a straight magnetic filter with a realistic magnetic field configuration. Considering a low-density collisionless plasma projection of the electron momentum equation along the magnetic field lines and the assumption of quasi-neutrality allows one to relate the plasma density to the electrostatic potential. The system of equations is closed using the ion mass conservation and ion momentum equations. The model is compared to measurements on the plasma jet generated in a pulsed copper vacuum arc with an annular anode, moving along a straight magnetic filter. Probe measurements of the ion saturation current and of the floating potential at different axial and radial positions along the filter, and for different magnetic field values, are used in the comparison with the model results. It is found that anomalous diffusion is needed to fit the experimental measurements. Moreover, a novel anomalous friction effect for ion motion across magnetic lines has to be invoked in order to prevent strong radial oscillations triggered by the fast magnetic focusing of the plasma at the filter entrance and obtain realistic results. A simple model is presented to account for both of these effects, based on the assumption of a high level of fluctuations in the plasma. © 2011 IEEE. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00933813_v39_n10_p2014_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	Anomalous transport magnetic field vacuum arc Annular anodes Anomalous diffusion Anomalous transport Different-magnetic fields Electron momentum equations Electrostatic potentials Experimental measurements Floating potentials Friction effect Ion mass Ion momentum Ion motions Ion saturation current Magnetic field configurations Magnetic field line Magnetic focusing Magnetic lines Model results Probe measurements Radial oscillation Radial position System of equations vacuum arc Vacuum arcs Collisionless plasmas Diffusion Friction Ions Magnetic fields Magnetic filters Magnetic separators Plasma accelerators Plasma density Plasma diagnostics Plasma jets Vacuum Vacuum applications Vacuum technology Magnetoplasma
spellingShingle	Anomalous transport magnetic field vacuum arc Annular anodes Anomalous diffusion Anomalous transport Different-magnetic fields Electron momentum equations Electrostatic potentials Experimental measurements Floating potentials Friction effect Ion mass Ion momentum Ion motions Ion saturation current Magnetic field configurations Magnetic field line Magnetic focusing Magnetic lines Model results Probe measurements Radial oscillation Radial position System of equations vacuum arc Vacuum arcs Collisionless plasmas Diffusion Friction Ions Magnetic fields Magnetic filters Magnetic separators Plasma accelerators Plasma density Plasma diagnostics Plasma jets Vacuum Vacuum applications Vacuum technology Magnetoplasma Minotti, F. Giuliani, L. Grondona, D. Della Torre, H. Kelly, H. Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
topic_facet	Anomalous transport magnetic field vacuum arc Annular anodes Anomalous diffusion Anomalous transport Different-magnetic fields Electron momentum equations Electrostatic potentials Experimental measurements Floating potentials Friction effect Ion mass Ion momentum Ion motions Ion saturation current Magnetic field configurations Magnetic field line Magnetic focusing Magnetic lines Model results Probe measurements Radial oscillation Radial position System of equations vacuum arc Vacuum arcs Collisionless plasmas Diffusion Friction Ions Magnetic fields Magnetic filters Magnetic separators Plasma accelerators Plasma density Plasma diagnostics Plasma jets Vacuum Vacuum applications Vacuum technology Magnetoplasma
description	A model is developed to describe the plasma jet generated in a vacuum arc, which enters and flows inside a straight magnetic filter with a realistic magnetic field configuration. Considering a low-density collisionless plasma projection of the electron momentum equation along the magnetic field lines and the assumption of quasi-neutrality allows one to relate the plasma density to the electrostatic potential. The system of equations is closed using the ion mass conservation and ion momentum equations. The model is compared to measurements on the plasma jet generated in a pulsed copper vacuum arc with an annular anode, moving along a straight magnetic filter. Probe measurements of the ion saturation current and of the floating potential at different axial and radial positions along the filter, and for different magnetic field values, are used in the comparison with the model results. It is found that anomalous diffusion is needed to fit the experimental measurements. Moreover, a novel anomalous friction effect for ion motion across magnetic lines has to be invoked in order to prevent strong radial oscillations triggered by the fast magnetic focusing of the plasma at the filter entrance and obtain realistic results. A simple model is presented to account for both of these effects, based on the assumption of a high level of fluctuations in the plasma. © 2011 IEEE.
format	JOUR
author	Minotti, F. Giuliani, L. Grondona, D. Della Torre, H. Kelly, H.
author_facet	Minotti, F. Giuliani, L. Grondona, D. Della Torre, H. Kelly, H.
author_sort	Minotti, F.
title	Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
title_short	Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
title_full	Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
title_fullStr	Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
title_full_unstemmed	Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
title_sort	model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter
url	http://hdl.handle.net/20.500.12110/paper_00933813_v39_n10_p2014_Minotti
work_keys_str_mv	AT minottif modelwithanomalousdiffusionandfrictionforavacuumarcplasmajetinastraightmagneticfilter AT giulianil modelwithanomalousdiffusionandfrictionforavacuumarcplasmajetinastraightmagneticfilter AT grondonad modelwithanomalousdiffusionandfrictionforavacuumarcplasmajetinastraightmagneticfilter AT dellatorreh modelwithanomalousdiffusionandfrictionforavacuumarcplasmajetinastraightmagneticfilter AT kellyh modelwithanomalousdiffusionandfrictionforavacuumarcplasmajetinastraightmagneticfilter
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Model with anomalous diffusion and friction for a vacuum-arc plasma jet in a straight magnetic filter

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