Multiple resonances of the edge-localized mode (ELM) frequency caused by the application of low n (=1 or 2) magnetic perturbations for ELM control have been observed on JET. With a low n field applied, a strong increase in ELM frequency, fELM, by a factor of ∼4.5 was found in many separated narrow windows of q95(resonant q95), while the fELMincreased only by a factor of ∼2 for non-resonant q95values. The fractions of increase in fELMwith different resonant q95values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and fELMdepend on the amplitude of the normalized edge current density as well as the edge safety factor, qa. © 2011 IAEA, Vienna.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Nuclear and High Energy Physics
Liang, Y., Gimblett, C. G., Browning, P. K., Devoy, P., Alfier, A., Calabrò, G., ... Zhang, T. (2011). Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak. Nuclear Fusion, 51(7), -. . https://doi.org/10.1088/0029-5515/51/7/073001