Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations
Physical Review Letters2012Vol. 109(3), pp. 035004–035004
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Y.M. Jeon, J.-K. Park, S.W. Yoon, W.H. Ko, S. G. Lee, K. D. Lee, G.S. Yun, Y.U. Nam, W. C. Kim, J.G. Kwak, K. S. Lee, H. K. Kim, H.L. Yang
Abstract
Edge localized modes (ELMs) in high-confinement mode plasmas were completely suppressed in KSTAR by applying n=1 nonaxisymmetric magnetic perturbations. Initially, the ELMs were intensified with a reduction of frequency, but completely suppressed later. The electron density had an initial 10% decrease followed by a gradual increase as ELMs were suppressed. Interesting phenomena such as a saturated evolution of edge T(e) and broadband changes of magnetic fluctuations were observed, suggesting the change of edge transport by the applied magnetic perturbations.
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