Multiple, coherent modes at frequencies up to the deuterium ion cyclotron frequency were observed during neutral-beam injection heating of the National Spherical Torus Experiment (NSTX). The modes were seen mainly in the frequency range of 0.4-2.5 MHz. The modes were identified as compressional Alfven waves excited by a resonant interaction with the energetic beam ions.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)