An analysis of the typical features of shear Alfven waves in tokamak plasmas in a frequency domain ranging from the high frequencies of the toroidal gap to the low frequencies is presented. The frequencies are comparable with the thermal ion diamagnetic frequency ω-*pi$/ and/or the thermal ion transit frequency ω-ti$/ = vti/qR0 where vti is the ion thermal speed. Line bending can explain the finite β stabilization of the electrostatic ITG. For increasing α (β), the coupling to the electromagnetic shear Alfven branch also increases while the stabilizing influence of line bending diminishes. As a consequence, the stabilizing influence of the electrostatic ITG is expected to be strongest somewhere between α = 0 and α = αcrit.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Condensed Matter Physics
- Nuclear and High Energy Physics