Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations |
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| Authors: | 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 Jong-Gu Kwak K S Lee H K Kim H L Yang;KSTAR team |
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| Institution: | National Fusion Research Institute, Daejeon, Korea. |
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| 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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