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Rotation and shear control of a weakly magnetized plasma column using current injection by emissive electrodes

Published online by Cambridge University Press:  14 June 2021

Victor Désangles Open the ORCID record for Victor Désangles [Opens in a new window] ,
Guillaume Bousselin ,
Alexandre Poyé Open the ORCID record for Alexandre Poyé [Opens in a new window]  and
Nicolas Plihon Open the ORCID record for Nicolas Plihon [Opens in a new window]
Victor Désangles
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, Lyon, F-69342, France
Guillaume Bousselin
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, Lyon, F-69342, France
Alexandre Poyé
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, Lyon, F-69342, France
Nicolas Plihon*
Affiliation:
Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, Lyon, F-69342, France
*
†Email address for correspondence: [email protected]
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Abstract

The evolution of the radial profile of the rotation of a weakly magnetized plasma column is investigated experimentally in a radio-frequency argon plasma at low pressure when a strong electron current is emitted by large emissive cathodes. Current injection from large emissive cathodes over a background plasma column (with a plasma density of a few $10^{18}\ \textrm {m}^{-3}$) is characterized. Radial scans of the ion velocity show that a continuous control of the rotation profile may be obtained using two spatial configurations for the locations of the emissive cathodes (either in the centre or at the edge of the plasma column). The rotation profile results from the electric drift velocity, damped by the drag exerted on the ions. We demonstrate that the evolution of the rotation profile with the injected current is then controlled by the modification of the plasma potential profile in the presence of strongly emissive cathodes.

Keywords

plasma flowsplasma deviceselectric discharges
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 3 , June 2021 , 905870308
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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