Effect of temperature anisotropy on the dynamics of geodesic acoustic modes
Plasma Physics
2023-04-19 v2
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
Cite
@article{arxiv.2209.14874,
title = {Effect of temperature anisotropy on the dynamics of geodesic acoustic modes},
author = {J. N. Sama and A. Biancalani and A. Bottino and I. Chavdarovski and D. Del Sarto and A. Ghizzo and T. Hayward-Schneider and P. Lauber and B. Rettino and F. Vannini},
journal= {arXiv preprint arXiv:2209.14874},
year = {2023}
}