M
M.F. Johnson
Researcher at European Atomic Energy Community
Publications - 8
Citations - 651
M.F. Johnson is an academic researcher from European Atomic Energy Community. The author has contributed to research in topics: Jet (fluid) & Supervised learning. The author has an hindex of 7, co-authored 8 publications receiving 570 citations.
Papers
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Journal ArticleDOI
Survey of disruption causes at JET
P. de Vries,M.F. Johnson,B. Alper,P. Buratti,T. C. Hender,H. R. Koslowski,V. Riccardo,Jet-Efda Contributors +7 more
TL;DR: In this article, a survey of the causes of all 2309 JET disruptions over the last decade of JET operations was carried out to obtain a complete picture of all possible disruption causes, in order to devise better strategies to prevent or mitigate their impact.
Journal ArticleDOI
An advanced disruption predictor for JET tested in a simulated real-time environment
G.A. Rattá,Jesús Vega,Andrea Murari,G. Vagliasindi,M.F. Johnson,P. de Vries,Jet-Efda Contributors +6 more
TL;DR: The robustness of the predictor has been proven and the performance of the developed detection system has been compared with the predictions of the JET protection system (JPS) and clearly outperforms JPS up to about 180 ms before the disruptions.
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Behaviour of disruption generated runaways in JET
TL;DR: In this article, it is shown that runaway generation in JET can be best modelled and understood by including avalanche processes and that the delay in runaway generation following temperature collapse is caused by the very high density generated by the disruption.
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Statistical analysis of disruptions in JET
TL;DR: In this paper, the authors found that the frequency at which JET operated close to the density-limit increased six fold over the last decade; however, only a small reduction in disruptivity was found.
Journal ArticleDOI
Prototype of an adaptive disruption predictor for JET based on fuzzy logic and regression trees
Andrea Murari,G. Vagliasindi,Paolo Arena,Luigi Fortuna,Oliviero Barana,M.F. Johnson,Jet-Efda Contributors +6 more
TL;DR: The results of applying fuzzy logic and classification and regression trees (CART) to the problem of predicting disruptions at JET are reported, proving that more flexible prediction strategies, not uniform over the whole discharge but tuned to the operational region of the plasma at any given time, can be very competitive and should be investigated systematically.