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Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak
Liang, Y; Gimblett, C G; Browning, P K; Devoy, P; Alfier, A; Calabro, G; Giroud, C; Harting, D; Koslowski, H R; Jachmich, S; Pearson, J; Sun, Y; Wiegmann, C; Zhang, T; Contributors, Jet-Efda
Nuclear Fusion. 2011;51(7).
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Abstract
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, f(ELM), by a factor of similar to 4.5 was found in many separated narrow windows of q(95) (resonant q(95)), while the f(ELM) increased only by a factor of similar to 2 for non-resonant q(95) values. The fractions of increase in f(ELM) with different resonant q(95) values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and f(ELM) depend on the amplitude of the normalized edge current density as well as the edge safety factor, q(a).
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- Liang, Y. Gimblett, C. G. Browning, P. K. Devoy, P. Alfier, A. Calabro, G. Giroud, C. Harting, D. Koslowski, H. R. Jachmich, S. Pearson, J. Sun, Y. Wiegmann, C. Zhang, T.