High frequency geodesic acoustic modes in electron scale turbulence
Artikel i vetenskaplig tidskrift, 2013

In this work the finite β-effects of an electron branch of the geodesic acoustic mode (el-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 el-GAMs driven non-linearly by ETG modes is derived. The ETG growth rate from the fluid model is compared with the results found from gyrokinetic simulations with good agreement. A new saturation mechanism for ETG turbulence through the interaction with el-GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared with the mixing length estimate. It is shown that the el-GAM may be stabilized by an increase in finite β as well as by increasing non-adiabaticity. The decreased GAM growth rates is due to the inclusion of the Maxwell stress.

ETG

Transport Barriers

Zonal Flows

GAM

Författare

Johan Anderson

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

Andreas Skyman

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

Hans Nordman

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

Raghvendra Singh

Institute for Plasma Research India

WCI

P.K. Kaw

Institute for Plasma Research India

Nuclear Fusion

0029-5515 (ISSN)

Vol. 53 12 article nr. 123016- 123016

Ämneskategorier

Fysik

Fusion, plasma och rymdfysik

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1088/0029-5515/53/12/123016

Mer information

Senast uppdaterat

2022-02-08