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Centrifugal instability in a weakly magnetized rotating plasma column

Published online by Cambridge University Press:  22 June 2023

S. Aggarwal Open the ORCID record for S. Aggarwal [Opens in a new window] ,
Y. Camenen Open the ORCID record for Y. Camenen [Opens in a new window] ,
A. Escarguel  and
A. Poyé
S. Aggarwal*
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille, France
Y. Camenen
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille, France
A. Escarguel
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille, France
A. Poyé
Affiliation:
Aix-Marseille Université, CNRS, PIIM UMR 7345, Marseille, France
*
†Email address for correspondence: [email protected]
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Abstract

A two-fluid model is developed to study the stability of weakly magnetized rotating plasma columns. Previous works have shown that rotating plasma columns are prone to centrifugal flute modes. Most of these models are based on the low-frequency assumption which is valid when the instability frequency and the plasma azimuthal frequency are small compared with the ion cyclotron frequency. This assumption is challenged in many laboratory plasma devices, including weakly magnetized plasma columns. A radially global dispersion relation relaxing the low-frequency approximation and applicable in these devices is derived. The validity domain of the low-frequency approximation is discussed. In addition, the impact of the radial boundary on the linear stability is investigated and comparison with results obtained in the radially local approximation are performed.

Keywords

plasma instabilitiesplasma dynamics
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 3 , June 2023 , 905890310
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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