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Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR
Kim, Jayhyun,Park, Gunyoung,Bae, Cheonho,Yoon, Siwoo,Han, Hyunsun,Yoo, Min-Gu,Park, Young-Seok,Ko, Won-Ha,Juhn, June-Woo,Na, Yong Su International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.2
<P>Among various edge localized mode (ELM) crash control methods, only non-axisymmetric magnetic perturbations (NAMPs) yield complete suppression of ELM crashes beyond their mitigation, and thus attract more attention than others. No other devices except KSTAR, DIII-D, and recently EAST have successfully achieved complete suppression with NAMPs. The underlying physics mechanisms of these successful ELM crash suppressions in a non-axisymmetric field environment, however, still remain uncertain. In this work, we investigate the ELM crash suppression characteristics of the KSTAR ELMy H-mode discharges in a controlled multi-spectral field environment, created by both <img ALIGN='MIDDLE' ALT='$n=2$ ' SRC='http://ej.iop.org/images/0029-5515/57/2/022001/nfaa3e05ieqn001.gif'/> middle reference and <img ALIGN='MIDDLE' ALT='$n=1$ ' SRC='http://ej.iop.org/images/0029-5515/57/2/022001/nfaa3e05ieqn002.gif'/> top/bottom proxy in-vessel control coils. Interestingly, the attempts have produced a set of contradictory findings, one expected (ELM crash suppression enhancement with the addition of <I>n</I> = 1 to the <I>n</I> = 2 field at relatively low heating discharges) and another unexpected (ELM crash suppression degradation at relatively high heating discharges) from the earlier findings in DIII-D. This contradiction indicates the dependence of the ELM crash suppression characteristics on the heating level and the associated kink-like plasma responses. Preliminary linear resistive MHD plasma response simulation shows the unexpected suppression performance degradation to be likely caused by the dominance of kink-like plasma responses over the island gap-filling effects.</P>