IAEA Fusion Energy Conference 2010Proceedings of the 23rd IAEA Fusion Energy ConferenceDaejeon, 11-16 October 2010 Organized by the
International Atomic Energy Agency IAEA-CN-180 (EXS/5-3) Interactions between MHD Instabilities in the Wall-stabilized High-β PlasmasG. Matsunaga1), N. Aiba1), K. Shinohara1), Y. Sakamoto1), M. Takechi1), T. Suzuki1), N. Asakura1), A. Isayama1), N. Oyama1), M. Yoshida1), K. Kamiya1), H. Urano1), T. Nakano1), Y. Kamada1), and the JT-60 Team1) Japan Atomic Energy Agency, Naka 311-0193, Japan
Abstract. In the JT-60U wall-stabilized high-βN plasmas,
interactions between MHD instabilities have been observed. It is
observed that an energetic particle driven wall mode (EWM) triggers an
edge localized mode (ELM). When the EWM appears, type-I ELM crashes
are synchronized with EWM bursts. The EWM-triggered ELMs have a
higher frequency and less energy release than those of usual type-I
ELMs. This interaction mainly occurs when the EWM with a large
amplitude appears. In the SOL region, several measurements indicate
ion losses induced by the EWM. Abrupt ion losses through the edge can
increase as local pressure gradient at the pedestal that determines
the edge stability. Moreover, another interaction that an
EWM-triggered ELM excites marginal resistive wall mode (RWM) is
observed. Just after the EWM-triggered ELM, an n = 1 distortion
appears and decays soon. It is considered that an impact of the
induced ELM can excite the marginally stable RWM.
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