Abstract
The energy input and frequency shift of geodesic acoustic modes (GAMs) due to turbulence in tokamak edge plasmas are investigated in numerical two-fluid turbulence studies. Surprisingly, the turbulent GAM dispersion relation is qualitatively equivalent to the linear GAM dispersion but can have drastically enhanced group velocities. In up-down asymmetric geometry the energy input due to turbulent transport may favor the excitation of GAMs with one particular sign of the radial phase velocity relative to the magnetic drifts and may lead to pulsed GAM activity.
| Original language | English (US) |
|---|---|
| Article number | 035004 |
| Journal | Physical review letters |
| Volume | 108 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jan 19 2012 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy