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Effect of temperature anisotropy on the dynamics of geodesic acoustic modes

Published online by Cambridge University Press:  06 March 2023

J.N. Sama Open the ORCID record for J.N. Sama [Opens in a new window] ,
A. Biancalani Open the ORCID record for A. Biancalani [Opens in a new window] ,
A. Bottino ,
I. Chavdarovski Open the ORCID record for I. Chavdarovski [Opens in a new window] ,
D. Del Sarto Open the ORCID record for D. Del Sarto [Opens in a new window] ,
A. Ghizzo Open the ORCID record for A. Ghizzo [Opens in a new window] ,
T. Hayward-Schneider Open the ORCID record for T. Hayward-Schneider [Opens in a new window] ,
Ph. Lauber ,
B. Rettino Open the ORCID record for B. Rettino [Opens in a new window]  and
F. Vannini Open the ORCID record for F. Vannini [Opens in a new window]
J.N. Sama*
Affiliation:
Institut Jean Lamour UMR 7198, Université de Lorraine-CNRS, Nancy 54011, France
A. Biancalani
Affiliation:
Léonard de Vinci Pôle Universitaire, Research Center, Paris La Défense 92400, France Max Planck Institute for Plasma Physics, Garching 85748, Germany
A. Bottino
Affiliation:
Max Planck Institute for Plasma Physics, Garching 85748, Germany
I. Chavdarovski
Affiliation:
Korea Institute of Fusion Energy, Daejeon 34133, South Korea
D. Del Sarto
Affiliation:
Institut Jean Lamour UMR 7198, Université de Lorraine-CNRS, Nancy 54011, France
A. Ghizzo
Affiliation:
Institut Jean Lamour UMR 7198, Université de Lorraine-CNRS, Nancy 54011, France
T. Hayward-Schneider
Affiliation:
Max Planck Institute for Plasma Physics, Garching 85748, Germany
Ph. Lauber
Affiliation:
Max Planck Institute for Plasma Physics, Garching 85748, Germany
B. Rettino
Affiliation:
Max Planck Institute for Plasma Physics, Garching 85748, Germany
F. Vannini
Affiliation:
Max Planck Institute for Plasma Physics, Garching 85748, Germany
*
†Email address for correspondence: juvert-njeck.sama@univ-lorraine.fr
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Abstract

In this work, we revisit the linear gyro-kinetic theory of geodesic acoustic modes (GAMs) and derive a general dispersion relation for an arbitrary equilibrium distribution function of ions. A bi-Maxwellian distribution of ions is then used to study the effects of ion temperature anisotropy on GAM frequency and growth rate. We find that ion temperature anisotropy yields sensible modifications to both the GAM frequency and growth rate as both tend to increase with anisotropy and these results are strongly affected by the electron to ion temperature ratio.

Keywords

fusion plasmaplasma instabilitiesplasma simulation
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 1 , February 2023 , 905890109
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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