[Table of Contents]

Plasma and Fusion Research

Volume 5, 034 (2010)

Regular Articles

Studies of MHD Stability Using Data Mining Technique in Helical Plasmas
Satoshi YAMAMOTO, David PRETTY1), Boyd BLACKWELL2), Kazunobu NAGASAKI, Hiroyuki OKADA, Fumimichi SANO, Tohru MIZUUCHI, Shinji KOBAYASHI, Katsumi KONDO3), Ruben JIMÉNEZ-GÓMEZ1), Enrique ASCASÍBAR1), Kazuo TOI5) and Satoshi OHDACHI5)
Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
1)
Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT, Madrid 28040, Spain
2)
Australian National University, Canberra ACT 0200, Australia
3)
Graduate School of Energy Science, Kyoto University, Uji 611-0011, Japan
4)
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 5 December 2008 / Accepted 19 November 2009 / Published 1 October 2010)

Abstract

Data mining techniques, which automatically extract useful knowledge from large datasets, are applied to multichannel magnetic probe signals of several helical plasmas in order to identify and classify MHD instabilities in helical plasmas. This method is useful to find new MHD instabilities as well as previously identified ones. Moreover, registering the results obtained from data mining in a database allows us to investigate the characteristics of MHD instabilities with parameter studies. We introduce the data mining technique consisted of pre-processing, clustering and visualizations using results from helical plasmas in H-1 and Heliotron J. We were successfully able to classify the MHD instabilities using the criterion of phase differences of each magnetic probe and identify them as energetic-ion-driven MHD instabilities using parameter study in Heliotron J plasmas.

Keywords

MHD stability, data mining, magnetic probe, energetic-ion-driven MHD instability, helical plasma

DOI: 10.1585/pfr.5.034

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References

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This paper may be cited as follows:

Satoshi YAMAMOTO, David PRETTY, Boyd BLACKWELL, Kazunobu NAGASAKI, Hiroyuki OKADA, Fumimichi SANO, Tohru MIZUUCHI, Shinji KOBAYASHI, Katsumi KONDO, Ruben JIMÉNEZ-GÓMEZ, Enrique ASCASÍBAR, Kazuo TOI and Satoshi OHDACHI, Plasma Fusion Res. 5, 034 (2010).