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Radial distribution of the plasma potential in a cylindrical plasma column with a longitudinal magnetic field

Published online by Cambridge University Press:  13 August 2021

G. Liziakin Open the ORCID record for G. Liziakin [Opens in a new window] ,
A. Oiler Open the ORCID record for A. Oiler [Opens in a new window] ,
A. Gavrikov Open the ORCID record for A. Gavrikov [Opens in a new window] ,
N. Antonov Open the ORCID record for N. Antonov [Opens in a new window]  and
V. Smirnov
G. Liziakin*
Affiliation:
Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS), Moscow, Russia
A. Oiler
Affiliation:
Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS), Moscow, Russia Moscow Institute of Physics and Technology (National Research University), Moscow, Russia
A. Gavrikov
Affiliation:
Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS), Moscow, Russia
N. Antonov
Affiliation:
Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS), Moscow, Russia
V. Smirnov
Affiliation:
Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS), Moscow, Russia
*
†Email address for correspondence: [email protected]
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Abstract

The possibility of controlling the electrostatic field distribution in plasma has yielded wide prospects for modern technologies. As a magnetic field primarily allows for creating electric fields in plasma, it serves as an additional obstacle for the current flow through a medium. In the present paper, an axially symmetric system is considered in which the magnetic field is directed along the axis and concentric electrodes are located at the ends. The electrodes are negatively biased. A model which solves the problem of the radial distribution of the plasma potential inside the cylindrical plasma column supported by the end electrodes is proposed. The most commonly encountered configurations of the electrical connection for the end electrodes are considered, and the particular solutions to the problem of the radial distribution are presented. The contribution of ions and electrons to the transverse conductivity is evaluated in detail. The influence of a thermionic element on the radial profile of the plasma potential is considered. To verify the proposed model, an experimental study of the reflex discharge is carried out with both cold electrodes and a thermionic element on the axis. A comparison of the computational model results with experimental data is given. The presented model makes it possible to solve the problem concerning the plasma potential distribution in the case of an arbitrary number of end electrodes, and also to take into account the inhomogeneity of the distribution of plasma density, neutral gas pressure and electron temperature along the radius.

Keywords

electric dischargesplasma applications
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 4 , August 2021 , 905870414
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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