Publication: Locked mode and disruptions in JET-ILW
Дата
2019
Авторы
Gerasimov, S. N.
Abreu, P.
Artaserse, G.
Buratti, P.
Zakharov, L. E.
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© EPS 2019. All rights reserved.This paper limits itself exclusively to the relation between LM and disruptions. It appears that there is no definite value of Locked Mode Saddle (LMS) signal which precedes disruptions. We can speculate that an n=1 island of given amplitude can trigger other modes and a disruption. It should depend on the underlying current profile, which determines how much different modes interact, but this is certainly beyond our knowledge. These studies reveal that for the majority of JET pulses the LMS signal is not a good predictor of disruptions, but the LMS usually precedes disruptions. For JET, the 0.8 mT/MA threshold could be used for MGI triggering for the low-density LM disruption. Low LM threshold (0.2 mT/MA) may be used for JET pulse fast shutdown because it is a good indicator of unhealthy plasma conditions.
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Locked mode and disruptions in JET-ILW / Gerasimov, S.N. [et al.] // 46th EPS Conference on Plasma Physics, EPS 2019. - 2019