Effect of temperature anisotropy on the dynamics of geodesic acoustic modes
Juvert Njeck Sama and Alessandro Biancalani and Alberto Bottino and I Chavdarovski and Daniele Del Sarto and Alain Ghizzo and Thomas Hayward-Schneider and Philipp Lauber and B Rettino
article
Journal Of Plasma Physics
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.
To cite this publication :
Juvert Njeck Sama, Alessandro Biancalani, Alberto Bottino, I Chavdarovski, Daniele Del Sarto, Alain Ghizzo, Thomas Hayward-Schneider, Philipp Lauber, B Rettino: Effect of temperature anisotropy on the dynamics of geodesic acoustic modes. Dans: Journal Of Plasma Physics, vol. 89, no. 1, p. 905890109, 2023.