High Frequency Geodesic Acoustic Modes in Electron Temperature Gradient Mode Turbulence
Plasma Physics
2012-08-10 v2
Abstract
In this work the first demonstration of a high frequency branch of the geodesic acoustic mode (GAM) driven by electron temperature gradient (ETG) modes is presented. The work is based on a fluid description of the ETG mode retaining non-adiabatic ions and the dispersion relation for high frequency GAMs driven nonlinearly by ETG modes is derived. A new saturation mechanism for ETG turbulence through the interaction with high frequency GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared to the mixing length estimate.
Cite
@article{arxiv.1203.1174,
title = {High Frequency Geodesic Acoustic Modes in Electron Temperature Gradient Mode Turbulence},
author = {Johan Anderson and Hans Nordman and Raghvendra Singh and Predhiman Kaw},
journal= {arXiv preprint arXiv:1203.1174},
year = {2012}
}
Comments
14 pages, submitted to Physics of Plasmas